WO1999012214A1 - Dispositif a semi-conducteur a grille isolee et procede de fabrication - Google Patents
Dispositif a semi-conducteur a grille isolee et procede de fabrication Download PDFInfo
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- WO1999012214A1 WO1999012214A1 PCT/JP1997/003040 JP9703040W WO9912214A1 WO 1999012214 A1 WO1999012214 A1 WO 1999012214A1 JP 9703040 W JP9703040 W JP 9703040W WO 9912214 A1 WO9912214 A1 WO 9912214A1
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- gate
- main surface
- upper main
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- insulating film
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
- H01L29/42372—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out
- H01L29/4238—Gate electrodes for field effect devices for field-effect transistors with insulated gate characterised by the conducting layer, e.g. the length, the sectional shape or the lay-out characterised by the surface lay-out
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
- H01L29/42312—Gate electrodes for field effect devices
- H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
Definitions
- Insulated gate type semiconductor device and manufacturing method thereof
- the present invention relates to an insulated gate semiconductor device and a method of manufacturing the same, and more particularly, to an improvement for improving gate withstand voltage.
- a gate electrode buried in a trench (trench) formed in the main surface of a semiconductor substrate that is, an insulated gate semiconductor device having a trench gate (tentatively called a “vertical device”) has a gate electrode Unlike an insulated gate type semiconductor device (provisionally referred to as a “horizontal type device”) formed so as to face the main surface of the semiconductor substrate, the gate electrode is formed in a direction perpendicular to the main surface.
- the area occupied by the unit cell on the main surface can be reduced. For this reason, the number of cells per unit area, that is, the cell density can be increased by using the fine processing technology.
- the main current flowing between the pair of main electrodes of the device increases when the device is in the conducting state (on state).
- the electrical resistance between a pair of main electrodes when an insulated gate semiconductor device is in a conductive state is called “on-resistance” and is one of the important indices for evaluating device characteristics. I have.
- j-FET resistance one of the components of the on-resistance, “j-FET resistance”, becomes non-negligibly high. For this reason, there is a limit in increasing the main current while keeping the on-resistance within a certain limit in a horizontal device.
- vertical devices have the advantage that there is no limit due to the j-FET resistance.
- Typical examples that take advantage of the vertical device are MOSFETs with trench gates (M0S-type field-effect transistors) and IGBTs with trench gates. ar Trans ist or) is widely known.
- FIG. 69 is a plan view of a gate wiring region of a conventional MOSFET having a trench gate.
- FIGS. 70 and 71 are cross-sectional views taken along lines AA and BB in FIG. 69, respectively.
- an n-type epitaxial layer 72 having a lower impurity concentration is formed on an n-type substrate layer 71 containing a high concentration of n-type impurities. With these semiconductor layers, the semiconductor substrate 9 9 Is configured.
- a p-type semiconductor layer 96 and a p-type layer 73 are selectively formed on the surface of the n-type epitaxial layer 72, that is, on the upper main surface of the semiconductor substrate 99.
- the p-type layer 73 is connected to the p-type semiconductor layer 96 and is formed so as to surround the periphery of the p-type semiconductor layer 96.
- a plurality of gate grooves 76 arranged in parallel with each other are formed in a band shape on the upper main surface of the semiconductor substrate 99.
- Gate groove 76 is formed deeper than p-type semiconductor layer 96 and shallower than n-type epitaxial layer 72.
- a longitudinal edge of the gate groove 76 exists in the gate wiring region depicted in FIGS.
- the inner wall of the gate groove 76 is covered with a gate insulating film 78, and the gate groove 76 is made of polysilicon doped with a high concentration of impurities through the gate insulating film 78.
- Gate electrode 7 7 is buried.
- a region in the upper main surface of the semiconductor substrate 99 where the gate electrode 7 does not exist is covered with the insulating film 87 or the insulating film 74.
- the insulating film 7 4 which is formed thicker than the insulating film 8 7 as a LOCOS (local ox i da ti on of silic on) film, is spaced from the gate groove 6 on the p-well layer 73. It is selectively formed along the direction of arrangement of the gate grooves 6 while maintaining the same.
- the gate electrode 77 is connected to the gate wiring 79 near the longitudinal end of the gate groove 6.
- the gate wiring 79 is made of the same material as the gate electrode 77, and is integrally continuous with the gate electrode 77. Further, the gate wiring 79 is provided on the insulating film 74, and in order to realize connection with the gate electrode 77, the gate groove 6 is formed so as to cover the edge of the gate electrode 77. It extends toward.
- the insulating film 74 is provided to maintain a high breakdown voltage between the gate wiring 79 and the p-type layer 73.
- An n-type semiconductor layer 75 further containing arsenic at a high concentration is selectively formed on the upper main surface of the semiconductor substrate 99. The n-type semiconductor layer 75 is formed so as to surround the upper end UE of the longitudinal edge of the gate groove 6.
- a gate groove 76 and an insulating film 87 are formed by thermal oxidation. At this time, oxidation is accelerated by the action of impurities contained in the n-type semiconductor layer 75, so that the gate groove 76 covering the vicinity of the upper end portion UE and the insulating layer are formed.
- the film 87 is finished thickly. By doing so, the gate electrode near the upper end UE
- the surfaces of the gate electrode 77 and the gate wiring 79 are covered with a three-layered insulator composed of the insulating film 86, the BPSG layer 81, and the insulating film 89.
- Both 8 and 9 are composed of oxides.
- a source electrode 84 and a gate wiring 83 are provided on the insulating film 89. Both the source electrode 84 and the gate wiring 83 are composed of A to Si.
- an opening 95 is selectively formed in a portion above the insulating film 74, and the gate wiring 79 and the gate wiring 83 are formed through the opening 95. It is electrically connected.
- a drain electrode 85 is provided on the lower main surface of the semiconductor substrate 99, that is, on the surface of the n-type substrate layer 71.
- an n-type source layer is selectively formed in a region adjacent to the gate groove 76 in the upper main surface of the semiconductor substrate 99.
- the source electrode 84 is connected to the n-type epitaxial layer 72 and the n-type source layer exposed on the upper main surface of the semiconductor substrate 99 in the cell region.
- the portion of the P-type semiconductor layer 96 sandwiched between the n-type source layer and the n-type epitaxial layer 72 and facing the gate electrode 77 functions as a channel region.
- a positive voltage is applied to the source electrode 84 and the drain electrode 85.
- the magnitude of the main current flowing from the drain electrode 85 to the source electrode 84 is controlled by adjusting the voltage applied to the gate electrode 77 through the gate wiring 83 and the gate wiring 79. .
- a zero or negative voltage is applied as the gate voltage.
- the gate voltage is a negative value (-VGS)
- the insulating film must have a withstand voltage that can withstand these electric fields. A reliability test is performed at the final stage of the manufacturing process to evaluate the reliability of the dielectric strength.
- HTGB high-temperature gate bias
- the height of the applied gate voltage is often set to a value close to the guaranteed performance value for the device 150.
- the device 150 is subjected to such harsh conditions for an extended period of time. During that period, the state of deterioration of the gate insulating film 78 and the insulating film 87 and the degree of change in other characteristics are investigated. Through such a test, a portion covering the upper end UE of the gate groove 6 described above is pointed out as one of the weak points in the insulating film.
- the upper end UE is a portion where the semiconductor layer 75 projects at right angles to the gate electrode 77 and the gate wiring 79, as shown in an enlarged manner in FIG. For this reason, the electric field EF concentrates on a portion of the gate insulating film 78 and the insulating film 87 that covers the upper end UE. In addition, at the upper end portion U E, the gate insulating film 78 and the insulating film 87 are sharply bent, so that the film thickness is easily made thin. That is, in the gate insulating film 78 and the insulating film 87, the portion covering the upper end UE is a weak point in a double sense in increasing the gate breakdown voltage (gate-source breakdown voltage) of the device. .
- the n-type semiconductor layer 75 is provided for the purpose of improving the weak point by increasing the thickness of the insulating film covering the upper end portion UE.
- the present invention solves the above-mentioned problems, and improves the withstand voltage of the insulating film related to the insulation of the gate electrode and the gate wiring, that is, the gate withstand voltage, and the reliability, thereby improving the product yield. It is an object of the present invention to provide an insulated gate semiconductor device capable of performing the method described above, and to provide a method suitable for manufacturing the insulated gate semiconductor device.
- a device is the insulated gate semiconductor device, further comprising: a semiconductor substrate defining an upper main surface and a lower main surface, wherein the semiconductor substrate is of a first conductivity type exposed on the upper main surface.
- a third semiconductor layer of a first conductivity type having an impurity concentration higher than that of the first semiconductor layer wherein the third semiconductor layer has an opening in the upper main surface.
- a groove penetrating the third and second semiconductor layers and reaching the first semiconductor layer is formed.
- the device may further include an insulating film covering an inner wall of the groove and the upper main surface, a gate electrode buried in the groove via the insulating film, and a position separated from a longitudinal edge of the groove. And over the gate electrode and the insulating film covering the upper main surface, and are made of the same material as the gate electrode, and integrated with the gate electrode.
- a first gate wiring which is continuously provided; and a first gate wiring is provided on the upper main surface via the insulating film, away from the edge of the groove on a side opposite to the first gate wiring.
- a second gate wiring made of the same material as the gate electrode, a third gate wiring electrically connecting the first gate wiring and the second gate wiring, and a surface of the semiconductor substrate. And a pair of main electrodes each electrically connected.
- the third gate wiring is disposed apart from the edge of the groove, and one of the pair of main electrodes is electrically connected to the second and third semiconductor layers on the upper main surface. And the upper surface of the gate electrode is located on the same plane as the upper main surface or lower than the upper main surface at a portion in contact with the edge of the groove.
- the device according to a second aspect of the present invention is the insulating gate type semiconductor device according to the first aspect, wherein the first gate wiring and the second gate wiring are covered and the first gate wiring and the second gate wiring are formed on the first gate wiring and the second gate wiring.
- An insulating layer having selectively formed first and second openings, the third gate line being formed on the insulating layer;
- the groove is divided into a plurality of unit grooves arranged in parallel with each other, and the first gate wiring includes: The plurality of unit grooves are arranged in a strip shape so as to intersect with each other.
- the first opening is formed in a band shape along a longitudinal direction of the first gate wiring. .
- the first openings are dispersedly formed so as to avoid above the plurality of unit grooves. .
- the first opening is formed by dispersing by selecting above the plurality of unit grooves. I have.
- the third gate wiring is disposed on the upper main surface via the insulating film;
- the semiconductor device includes a connection wiring made of the same material as the first and second gate wirings, and further integrally and continuously with the first and second gate wirings.
- the device according to an eighth aspect of the present invention is the insulated gate semiconductor device according to the seventh aspect, wherein the first and second gate wirings are covered and the first and second gate wirings are respectively provided on the first and second gate wirings.
- Another connection wiring for electrically connecting the first gate wiring and the second gate wiring through the opening is further provided.
- the groove is divided into a plurality of unit grooves arranged in parallel with each other, and the first gate wiring Are arranged in a band shape so as to intersect with the plurality of unit grooves, and the connection wiring is arranged along a region between the plurality of unit grooves in the upper main surface.
- the insulating film covering the upper main surface of the semiconductor substrate may be formed in a region immediately below the second gate wiring. As a thick insulating film, it is formed thicker than in other regions.
- the semiconductor substrate is provided on the upper main surface so as to surround an upper end portion of the edge of the groove.
- a high-concentration semiconductor layer of a first conductivity type which is selectively formed and has an impurity concentration higher than that of the first semiconductor layer, wherein the high-concentration semiconductor layer is provided immediately below an edge of the thick insulating film. It is formed so as to cover also.
- the second gate wiring may be connected to the second semiconductor layer and may surround the periphery thereof.
- the insulated gate semiconductor device of the first aspect is provided.
- the second semiconductor layer extends to a region directly below the second gate wiring in the upper main surface.
- the semiconductor substrate is selected as the upper main surface so as to surround an upper end portion of the edge of the groove.
- the semiconductor device further includes a high-concentration semiconductor layer of the first conductivity type, which is formed in a uniform manner and has a higher impurity concentration than the first semiconductor layer.
- the high-concentration semiconductor layer is formed so as to cover a region immediately below the first gate wiring.
- the manufacturing method is the method for manufacturing an insulated gate semiconductor device, wherein the upper main surface and the lower main surface are defined and the first conductive type is exposed to the upper main surface.
- (1) a step of preparing a semiconductor substrate having a semiconductor layer; and selectively introducing a second conductivity type impurity into the upper main surface to form a second semiconductor layer of the second conductivity type into the first semiconductor layer.
- a first gate wiring which straddles over the upper surface and the insulating film covering the upper main surface, and which is provided continuously and integrally with the gate electrode; and a first gate wiring extending from the edge of the groove.
- a first opening and a second opening and forming respectively, cover the top of the insulating layer, the second Filling a first opening and a second opening to form a connection wiring for electrically connecting the first gate wiring and the second gate wiring, each of which forms an electrical connection on the surface of the semiconductor substrate; And a main electrode forming step of forming a pair of main electrodes so as to be connected to each other.
- one of the pair of main electrodes is formed so as to be electrically connected to the second and third semiconductor layers on the upper main surface, and the gate forming step Then, the gate electrode is formed such that an upper surface of the gate electrode is located on the same plane as the upper main surface or below the upper main surface at a portion in contact with the edge of the groove.
- the shielding film selectively opening is formed on the upper main surface. Forming a thick insulating film thicker than the insulating film in a region where the shielding film is opened by performing a thermal oxidation process on the upper main surface. In the groove forming step, the groove is formed avoiding the thick insulating film, and in the gate forming step, the second gate wiring is formed on the thick insulating film. You.
- the manufacturing method according to an eighteenth aspect of the present invention is the method for manufacturing an insulated gate semiconductor device according to the sixteenth aspect, wherein the method is performed simultaneously with the third semiconductor forming step, and selectively includes a first conductive layer on the upper main surface.
- the upper end of the edge of the groove is formed so as to be surrounded by the high-concentration semiconductor layer.
- a manufacturing method is a method of manufacturing an insulated gate semiconductor device, comprising: defining an upper main surface and a lower main surface and exposing the first conductive type to the upper main surface. (1) a step of preparing a semiconductor substrate having a semiconductor layer; and selectively introducing a second conductivity type impurity into the upper main surface to form a second semiconductor layer of the second conductivity type into the first semiconductor layer.
- one of the pair of main electrodes is formed so as to be electrically connected to the second and third semiconductor layers on the upper main surface, and the gate forming step Then, the gate electrode is formed such that an upper surface of the gate electrode is located on the same plane as the upper main surface or below the upper main surface at a portion in contact with the edge of the groove.
- the manufacturing method according to a 20th aspect of the present invention is the manufacturing method of the insulated gate semiconductor device according to the ninth aspect, further comprising: depositing an insulating layer so as to cover the first and second gate wirings; Forming a first opening and a second opening selectively on the first and second gate wirings in the layer, and covering the insulating layer, Forming another connection wiring for electrically connecting the first gate wiring and the second gate wiring by filling the second opening.
- all of the first to third gate wirings and the gate electrode are disposed apart from the insulating film covering the upper end of the longitudinal end of the groove. For this reason, The concentration of the electric field generated in the insulating film covering the upper end of the groove due to the gate voltage applied to the gate electrode and the gate wiring is reduced or eliminated. For this reason, the gate breakdown voltage and the yield of the device are improved.
- the first and second gate lines are connected by a connection line formed on the first and second gate lines. Therefore, it is not necessary to accurately adjust the relative position between the connection wiring and the groove, so that manufacturing is easy.
- the groove is divided into a plurality of unit grooves, the density of the main current is increased. Also, since the first gate wiring is arranged in a strip shape so as to intersect with the plurality of unit grooves, high precision is not required for the alignment of the first gate wiring in the arrangement direction of the plurality of unit grooves. , Easy to manufacture.
- the first opening is formed in a strip shape along the longitudinal direction of the strip-shaped first gate wiring, and high precision is not required for the position of the first opening. Easy.
- the first openings are formed in a dispersed manner, when forming the first openings, the effect on the insulating film located immediately below the first gate wiring is relatively small. Can be suppressed. For this reason, relatively high reliability is obtained for the portion of the insulating film located immediately below the first gate wiring. Also, by avoiding above the plurality of unit grooves, a relatively wide flat portion on the upper surface of the insulating layer is selected to form the first opening. Therefore, the formation of the first opening is relatively easy.
- the first opening is formed by selecting above the plurality of unit grooves, when the first opening is formed, the first opening is formed on the insulating film located immediately below the first gate wiring. There is no influence. Therefore, high reliability can be obtained for the portion of the insulating film located immediately below the first gate wiring.
- the first and second gate wirings are composed of the same material as the first and second gate wirings, and are connected to the first and second gate wirings integrally. Is connected, the electric resistance between the first and second gate lines can be kept low. Therefore, the switching speed of the device is increased.
- the electric resistance between the first and second gate wirings is further reduced. Can be suppressed. Therefore, the switching speed of the device is further increased.
- the groove is divided into a plurality of unit grooves, the density of the main current is increased.
- the connection wiring is provided along a region sandwiched between a plurality of unit grooves in the upper main surface, that is, a region close to the gate electrode, the connection wiring is provided between the gate electrode and the second gate wiring. The electric fan can be kept low.
- the device according to the tenth aspect since a thick insulating film having a large thickness is interposed between the second gate wiring and the semiconductor base, a high withstand voltage between the second gate wiring and the semiconductor base is ensured. Is done.
- the insulating film covering the upper end is formed thick. Further, since the high-concentration semiconductor layer is also formed immediately below the edge of the thick insulating film, which is the weak point of the insulating film, this weak point is reinforced. As a result, the reliability of the insulating film is improved.
- the fourth semiconductor layer is formed so as to surround the second semiconductor layer and the lower end portion of the edge of the groove, the breakdown voltage of the device is improved.
- the second semiconductor layer extends to a region immediately below the second gate wiring, a relatively high withstand voltage can be obtained without separately providing the fourth semiconductor layer. Can be.
- the insulating film covering the upper end is formed thick. Therefore, the reliability of the insulating film is improved.
- the high-concentration semiconductor layer is formed so as to cover the region immediately below the first gate wiring, the opening of the insulating layer is formed on the first gate wiring.
- the deterioration of the insulating layer immediately below the first gate wiring caused by the deterioration is compensated. That is, the reliability of the insulating layer is improved.
- a device in which the concentration of an electric field generated in the insulating film covering the upper end portion of the groove is reduced or eliminated can be easily manufactured by a combination of conventionally known techniques.
- the first and second gate wirings are connected by the connection wiring formed on the first and second gate wirings, it is necessary to accurately match the relative positions between the connection wirings and the grooves. Absent. For this reason, manufacture is particularly easy.
- a device having a high withstand voltage between the second gate wiring and the semiconductor substrate can be easily manufactured.
- a device having a high reliability of the insulating film can be easily manufactured.
- the concentration of the electric field generated in the insulating film covering the upper end portion of the groove is reduced or eliminated, and a device having a high switching speed can be easily manufactured by a combination of conventionally known technologies. Can be.
- a device having a higher switching speed can be easily manufactured.
- FIG. 1 is a front sectional view of the device according to the first embodiment.
- FIG. 2 is a plan sectional view of the device according to the first embodiment.
- FIG. 3 is a plan view of the device according to the first embodiment.
- FIG. 4 is a front sectional view of the device according to the first embodiment.
- FIG. 5 is a side sectional view of the device according to the first embodiment.
- FIG. 6 is an enlarged front sectional view of the device of the first embodiment.
- FIG. 7 is a plan sectional view of another example of the device according to the first embodiment.
- FIG. 37 is a plan view of the device of the second embodiment.
- FIG. 38 is a front sectional view of the device of the second embodiment.
- FIG. 39 is a side sectional view of the device of the second embodiment.
- FIG. 40 is a plan view of another example of the device according to the second embodiment.
- FIG. 41 is a plan view of the device of the third embodiment.
- FIGS. 42 and 43 are front cross-sectional views of the device of the third embodiment.
- FIG. 44 is a plan view of another example of the device according to the third embodiment.
- FIG. 45 is a front sectional view of the device of the fourth embodiment.
- FIG. 46 is a plan view of the device of the fifth embodiment.
- 47 and 48 are front sectional views of the device of the fifth embodiment.
- 49 to 60 are manufacturing process diagrams of the device of the fifth embodiment.
- FIG. 61 is a plan view of the device according to the sixth embodiment.
- FIGS. 62 and 63 are front cross-sectional views of the device of the sixth embodiment.
- FIG. 64 is a front sectional view of the device of the seventh embodiment.
- FIG. 65 is a plan view of the device of the eighth embodiment.
- FIG. 66 is a front sectional view of the device of the eighth embodiment.
- FIG. 67 is a plan view of another device example of the eighth embodiment.
- FIG. 68 is a front sectional view of another example of the apparatus according to the eighth embodiment.
- FIG. 69 is a plan view of a conventional device.
- FIGS. 70 and 71 are front sectional views of a conventional device.
- FIG. 72 is an enlarged front sectional view of a conventional device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 2 is a plan cross-sectional view showing an upper main surface of a semiconductor base provided in the semiconductor device of the first embodiment.
- This device 101 is configured as a trench type M0SFET having a large number of unit cells.
- the semiconductor substrate 90 is a flat plate having an upper main surface and a lower main surface, and a number of gate grooves (trench) 6 are arranged in a stripe shape along the upper main surface so as to be arranged in parallel with each other. Is formed. One gate groove 6 is formed for each unit cell.
- the central portion of the semiconductor substrate 90 in which the unit cells are arranged (the region surrounded by the dotted line in FIG. 2) is called a “cell region CR”.
- a gate wiring (not shown) is provided around the cell region CR.
- the region where the gate wiring is provided is referred to as “gate wiring region GR”.
- the plan sectional view shown in FIG. 2 is a plan sectional view common to not only the device 101 of the first embodiment but also the devices of the following embodiments. is there.
- FIG. 3 is a plan view of the device 101 in the gate wiring region GR.
- FIG. 1 is a cross-sectional view taken along the line AA shown in FIGS. 2 and 3
- FIG. 4 is a cross-sectional view taken along the line BB shown in FIG.
- FIG. 5 is a cross-sectional view taken along the line CC in FIG. That is, FIGS. 1, 3, and 4 show the structure of the device 101 in the gate wiring region GR, and FIG. 5 shows the structure in the cell region CR.
- FIGS. 1, 3, and 4 show the structure of the device 101 in the gate wiring region GR
- FIG. 5 shows the structure in the cell region CR.
- a semiconductor substrate 90 made of silicon as a base material includes a flat n-type substrate layer 1 exposed on the lower main surface thereof, and an n-type epitaxial layer similarly formed on the n-type substrate layer 1. It has a unique layer 2. On the upper principal surface of the semiconductor substrate 90, that is, on the surface of the n-type epitaxial layer 2, a p-type semiconductor layer 22 and a p-type layer 3 are selectively formed.
- the n-type substrate layer 1 contains a high concentration of n-type impurities.
- the impurity concentration of the n-type epitaxial layer 2 is set lower than that of the n-type substrate layer 1.
- the p-type semiconductor layer 22 is formed so as to cover the entire cell region CR.
- the p-type layer 3 surrounds the p-type semiconductor layer 22 in the gate wiring region GR, and is formed so as to include the side edge of the p-type semiconductor layer 22.
- Both the p-type semiconductor layer 22 and the p-type layer 3 are formed shallower than the n-type epitaxial layer 2, that is, formed so that their bottoms do not reach the n-type substrate layer 1.
- Gate groove 6 opening on the upper main surface of semiconductor substrate 90 is formed deeper than p-type semiconductor layer 22 and shallower than n-type epitaxial layer 2.
- the gate wiring region The G-sized P-well layer 3 is formed to increase the breakdown voltage of the device.
- the p-type layer 3 is formed not to be shallower than the p-type semiconductor layer 22 so as to include the side edge of the p-type semiconductor layer 22.
- the p-type layer 3 is deeper than the p-type semiconductor layer 22 as shown in FIG. 4, and the longitudinal end of the gate groove 6 as shown in FIG. Desirably, it is formed so as to cover the lower end BE of the edge.
- an n-type semiconductor is formed so as to surround the upper end UE of the longitudinal edge of the gate groove 6.
- Body layer 5 is selectively formed on the upper main surface of semiconductor substrate 90.
- the n-type semiconductor layer 5 contains an n-type impurity at a higher concentration than the n-type epitaxial layer 2.
- the n-type semiconductor layer 23 is selectively formed on the upper main surface of the semiconductor substrate 90, that is, on the surface of the p-type semiconductor layer 22 so as to be adjacent to the gate groove 6. . That is, in the cell region CR, the n-type semiconductor layer 23 and the p-type semiconductor layer 22 are selectively exposed in a region between the plurality of gate grooves 6 on the upper main surface of the semiconductor substrate 90. ing.
- the n-type semiconductor layer 23 contains an n-type impurity at a higher concentration than the n-type epitaxial layer 2.
- the n-type semiconductor layer 23 is formed shallower than the p-type semiconductor layer 22.
- a gate insulating film 8 made of silicon oxide is formed on the inner wall of the gate groove 6. Then, the gate electrode 7 is buried in the gate groove 6 via the gate insulating film 8. Gate electrode 7 is made of polysilicon doped with impurities at a high concentration. The upper surface of the gate electrode 7 and the surface of the gate electrode 7 protruding from the gate groove 6 (FIG. 5) are covered with an insulating film 16 made of silicon oxide.
- the upper main surface of the semiconductor substrate 90 excluding the gate groove 6 is also covered with the insulating film 17 made of silicon oxide.
- a part of the upper main surface in the gate wiring region GR is covered with an insulating film 4 formed as an L0C0S oxide film thicker than the insulating film 17 instead of the insulating film 17.
- an opening is selectively formed in the insulating film 17, and through this opening, the source electrode 14 and the p-type semiconductor layer 22 and n It is connected to both of the mold semiconductor layers 23.
- the drain electrode 15 is formed on the exposed surface of the n-type substrate layer 1, that is, on the lower main surface of the semiconductor substrate 90.
- a drain current flows through the source electrode 14 and the drain electrode 15. That is, the source electrode 14 and the drain electrode 15 function as a pair of main electrodes.
- One source electrode 14 is made of, for example, Ato Si
- the other drain electrode 15 is made of, for example, a Ti / Ni / Au alloy.
- the n-type semiconductor is opposed to the gate electrode 7 through the gate insulating film 8.
- the portion of the p-type semiconductor layer 22 sandwiched between the body layer 23 and the n-type epitaxial layer 2 functions as a channel region CH.
- the magnitude of the main current is controlled by the voltage applied to the gate electrode 7. That is, the device 101 is configured as an n-channel M0SFET.
- gate wirings 9 and 10 are provided in the gate wiring area GR. These gate wires 9 and 10 are made of the same material as the gate electrode 7.
- the gate wiring 9 extends in the direction in which the gate grooves 6 are arranged so as to extend over the upper surface of the gate electrode 7 near the longitudinal edge of the row of the gate grooves 6 and the upper main surface of the semiconductor substrate 90. Along and above them are arranged.
- the gate wiring 9 is integrally connected to the column of the gate electrode 7.
- the gate wiring 9 is preferably formed in a strip shape so as to be orthogonal to the column of the gate electrode 7 as shown in FIG.
- the gate wiring 9 is arranged at a position slightly receded from the edge so as not to cover the upper end UE of the edge in the longitudinal direction of the row of the gate grooves 6. Further, as shown in an enlarged view in the vicinity of the upper end portion UE in FIG. 6, the position of the upper surface of the gate electrode 7 is at least in the vicinity of the longitudinal edge of the gate groove 6 and the upper main surface of the semiconductor substrate 90. It is set on the same plane as or below, and is preferably set below, as shown in FIG. By setting it below, it is possible to eliminate the effects of manufacturing errors. Further, as shown in FIG. 1, the upper end UE is surrounded by the n-type semiconductor layer 5 described above.
- An insulating film 17 is interposed between the upper main surface of the semiconductor substrate 90 and the gate wiring 9, and the two are electrically insulated by the insulating film 17.
- An insulating film 4 is formed on the exposed surface of the p-type layer 3 in a region located in the extension direction of the longitudinal edge of the gate groove 6.
- a gate wiring 10 is provided on the insulating film 4 so as to extend in the direction in which the gate electrodes 7 are arranged.
- the gate wiring 10 and the p-type layer 3 are electrically insulated by the insulating film 4.
- the surfaces of the gate wirings 9 and 10, that is, the side walls and the upper surface are also covered with the insulating film 18 made of a silicon oxide film, like the insulating film 16 covering the upper surface of the gate electrode 7.
- BPSG silicate glass containing boron and phosphorus
- Layer 11 has been formed.
- the upper surface of the BPSG layer 11 is covered with an insulating film 19 composed of a silicon oxide film.
- an opening is selectively formed at a connection portion between the source electrode 14 and the semiconductor substrate 90. As a result, the connection between the source electrode 14 and the semiconductor substrate 90 is realized.
- the above-mentioned multilayer insulator further includes an opening 20 formed in a band along the upper surface of the gate wiring 9 and an opening 21 formed in a band along the upper surface of the gate wiring 10. Is formed. Then, a gate wiring 13 is formed on the multilayer insulator so as to fill both of the openings 20 and 21 and connect them to each other. That is, the gate wiring 13 electrically connects the gate wiring 9 and the gate wiring 10 to each other through the openings 20 and 21.
- the gate wiring 13 is made of the same material as the source electrode 14 unlike the gate wirings 9 and 10.
- the gate wiring 13 and the source electrode 14 are electrically insulated from each other.
- a positive voltage is applied to the drain electrode 15 with reference to the source electrode 14 by connecting an external power supply (not shown).
- a load (not shown) is inserted between the external power supply and, for example, the drain electrode 15.
- the magnitude of the main current is controlled by adjusting the voltage applied to the gate electrode 7 through the gate wires 9, 10, and 13.
- an n-type inversion layer is formed in the p-type channel region CH. It is formed. As a result, the channel region CH becomes conductive, so that a main current flows from the drain electrode 15 to the source electrode 14. That is, the device 101 becomes conductive.
- the gate voltage applied between the source electrode 14 and the gate electrode 7 is returned to zero or a negative (reverse bias) value (the gate is turned off)
- the inversion layer formed in the channel region CH becomes Disappears and the channel region CH returns to the original p-type conductivity type.
- the upper end UE of the gate groove 6 is Not covered by any of the nine.
- the upper surface of the gate electrode 7 is not located above the upper main surface of the semiconductor substrate 90 at the upper end UE, and the gate wiring 9 is disposed apart from the upper end UE.
- the connection between the gate wiring 9 and the gate wiring 10 is realized by the gate wiring 13 arranged on the multilayer insulator including the BPSG layer 11. In other words, unlike the conventional device 150, the gate wiring is arranged so as to avoid the upper end UE.
- the concentration of the electric field generated in the gate insulating film 8 and the insulating film 17 at the upper end UE due to the gate voltage applied to the gate electrode 7 and the gate wirings 9, 10, 13 is reduced. Or be resolved. Therefore, the gate breakdown voltage of the device 101 and the yield as a product are improved.
- the gate insulating film 8 and the insulating film 17 at the upper end portion U E are formed thicker. Furthermore, since an insulating film 4 formed thicker than the insulating film 17 is interposed between the gate wiring 10 and the p-type layer 3, the gap between the gate wiring 10 and the p-type layer 3 is increased. The withstand voltage of this is sufficiently high. These factors also contribute to the improvement of the breakdown voltage and reliability of the equipment.
- FIG. 2 shows an example in which the rows of the gate grooves 6 are arranged in a strip shape (striped shape) parallel to each other
- the structure in the gate wiring region GR is shown in FIGS. 1 to 4 and FIG. It is sufficient if the structure in the cell region CR is the form shown in FIG.
- the gate grooves 6 may be arranged in a grid pattern (cross stripe pattern).
- the cross-sectional structures along the A-A cutting line, the BB cutting line, and the C-C cutting line in FIG. 7 are the same as those shown in FIGS. Are identical.
- FIG. 8 to 37 are manufacturing process diagrams showing a preferred method of manufacturing the device 101.
- the process shown in FIG. 8 is first performed.
- a semiconductor substrate containing silicon as a base material and containing n-type impurities at a high concentration is prepared.
- This semiconductor substrate corresponds to the n-type substrate layer 1 described above.
- an n-type epitaxial layer is formed on the upper main surface of the n-type substrate layer 1 by using an epitaxial growth method.
- the taxi layer 2 is formed.
- a flat semiconductor substrate 90 made of silicon as a base material is completed.
- a thermal oxide film 32 is formed on the entire upper main surface of the semiconductor substrate 90.
- the portion of the thermal oxide film 32 corresponding to the p-type layer 3 is selectively removed.
- a new thermal oxide film 31 is formed thinner than the thermal oxide film 32 in the removed region.
- the selective removal of the thermal oxide film 32 is performed by performing selective etching using a resist pattern formed by photolithography as a shield. This technique is well known in the art.
- boron is injected into the surface of the n-type epitaxial layer 2, that is, the upper main surface of the semiconductor substrate 90. Thereafter, heat treatment is performed to diffuse boron. As a result, the p-type layer 3 is selectively formed on the upper main surface of the n-type epitaxial layer 2. It is obvious that the diffusion step is performed along with the implantation step, and the description is omitted below.
- a resist layer is first deposited on the thermal oxide films 31 and 32. Thereafter, a region corresponding to the p-type semiconductor layer 22 of the resist layer is selectively removed to form a resist pattern 33. Next, the thermal oxide films 31 and 32 are selectively removed by performing etching while using the resist pattern 33 as a shield.
- boron is implanted into the upper main surface of the semiconductor substrate 90, that is, the surface of the n-type epitaxial layer 2.
- a p-type semiconductor layer 22 is formed on the surface of the n-type epitaxial layer 2 so as to be connected to the p-type layer 3.
- the resist pattern 33 is removed.
- the remaining thermal oxide film 31 is removed.
- FIG. 13 is a cross-sectional view of the gate wiring region GR taken along section line A—A.
- FIG. 14 is a cross-sectional view of the gate wiring area GR taken along section line B—B.
- FIG. 15 is a cross-sectional view of the cell region CR taken along the line C-C.
- a thermal oxide film 91 is formed.
- the upper main surface of semiconductor substrate 90 is covered with insulating film 4 and thermal oxide film 91.
- a resist layer is deposited on the upper surfaces of the insulating film 4 and the thermal oxide film 91, openings are formed in portions corresponding to the n-type semiconductor layers 23 and 5.
- the thermal oxide film 91 is selectively removed by performing a wet etching process while using the patterned resist layer 35 as a shield.
- arsenic is selectively implanted into the upper main surface of the semiconductor substrate 90 while using the insulating film 4 and the patterned thermal oxide film 91 as a shield.
- n-type semiconductor layers 23 and 5 are selectively formed on the upper main surface of semiconductor substrate 90.
- thermal oxide film 91 is removed.
- the entire upper surface of the intermediate product for example, a thermal oxide film 36 and the HT0 layer 37 are formed.
- an opening is selectively formed in a portion corresponding to the gate groove 6 of the thermal oxide film 36 and the HT0 layer 37.
- Gate groove 6 is formed to penetrate n-type semiconductor layer 23 and n-type semiconductor layer 5. Therefore, n-type semiconductor layer 23 and n-type semiconductor layer 5 are adjacent to the side wall of gate groove 6. Thereafter, the thermal oxide film 36 and the HT0 layer 37 are removed.
- the gate groove 6 A thermal oxide film is formed on the entire inner wall of semiconductor substrate 90 and the upper main surface of semiconductor substrate 90. That is, a gate insulating film 8 covering the gate groove 6 and an insulating film 17 covering the upper main surface of the semiconductor substrate 90 are formed.
- the polysilicon layer with a high concentration of n-type impurity Force is deposited over the entire upper surface of the intermediate product.
- the polysilicon layer 38 fills the gate groove 6 and is deposited until the thickness from the upper main surface of the semiconductor substrate 90 becomes a certain value or more.
- the deposition of the polysilicon layer 38 is performed by using, for example, a CVD method.
- a resist layer is formed on the upper surface of the polysilicon layer 38. Is deposited. Thereafter, the resist layer is selectively removed except for portions corresponding to the gate wiring 9 and the gate wiring 10. As a result, a resist pattern 39 is formed.
- the resist pattern 39 is used as a shield while the polysilicon is used.
- the layer 38 By selectively etching the layer 38, the gate electrode 7 and the gate wiring 9, 10 are formed. At this time, the etching is controlled so that the upper surface of the gate electrode 7 is not positioned above the upper main surface of the semiconductor substrate 90 near the upper end portion UE.
- the gate electrode 7 and the gate wiring 9, 10 A thermal oxide film is formed on the entire surface of the substrate. That is, the insulating film 16 covering the surface of the gate electrode 7 and the insulating film 18 covering the surfaces of the gate wires 9 and 10 are formed to a thickness of, for example, about 20 to 30 nm. Thereafter, the BPSG layer 11 is formed on the insulating films 16 and 18 by using the CVD method. Thereafter, an oxide film as an insulating film 19 is formed on the BPSG layer 11 to a thickness of, for example, about 100 nm by using a CVD method. As a result, a multilayer insulator having a three-layer structure is formed by the insulating films 16, 17, 18, the BPSG layer 11, and the insulating film 19.
- the multilayer insulator is selectively etched using a resist pattern (not shown). Is applied. This selective etching is based on a wet method and a dry method. Performed using As a result, openings 20 and 21 and an opening for connecting source electrode 14 and semiconductor substrate 90 are formed in the multilayer insulator.
- an A-Si layer is deposited so as to fill each opening formed in the multilayer insulator and cover the upper surface of the multilayer insulator.
- the deposition of the A-Si layer is performed by using, for example, a sputtering method.
- the source electrode 14 and the gate wiring 13 are formed as shown in FIG. 1 and FIGS.
- the drain electrode 15 is formed on the surface of the n-type substrate layer 1, that is, on the lower main surface of the semiconductor substrate 90, whereby the device 101 is completed.
- the formation of the drain electrode 15 is performed by, for example, depositing a Ti / Ni / Au alloy on the surface of the n-type substrate layer 1 by using a sputtering method.
- the apparatus 101 can be easily manufactured by combining the conventionally known technologies such as the photolithography technology, the ion implantation technology, the CVD method, and the thermal oxidation process.
- FIG. 37 is a plan view of the gate wiring region GR of the device 102 according to the second embodiment.
- FIG. 38 and FIG. 39 are cross-sectional views taken along the line A—A and the line D—D in FIG. 37, respectively.
- the cross-sectional view taken along the BB cutting line in FIG. 37 is drawn in the same manner as FIG.
- the plan sectional view of FIG. 3 is common to all the embodiments, and the A—A section line and the B—B section line shown in FIG. — Corresponds to section A and section B — section B, respectively.
- an opening 40 formed in a portion deposited on the gate wiring 9 avoids a portion above the gate groove 6. It is characteristically different from the device 101 of the first embodiment in that it is formed. That is, the openings 40 are not formed in a strip shape along the strip-shaped gate wiring 9 but are formed discretely in each region sandwiched between the adjacent gate grooves 6.
- the gate wiring 13 is connected to the gate wiring 9 through the opening 40.
- the upper surface of the BPSG layer 11 is slightly Retreating downward. That is, a periodic step appears on the upper surface of the BPSG layer 11 according to the arrangement of the gate grooves 6.
- the width of the gate groove 6 is, for example, about 1 m.
- the interval between the gate grooves 6 is, for example, about 3, which is generally wider than the width of the gate groove 6. Therefore, the flat portion of the BPSG layer 11 is narrow above the gate groove 6 and wide above the region between the gate grooves 6. Since the opening 40 is formed by selecting this wide flat portion, the alignment of the mask pattern for forming the opening 40 is relatively easy.
- the opening 40 when the opening 40 is formed, dry etching is used because fine processing is required. For this reason, as shown in FIG. 39, the upper surface of the gate wiring 9 is also somewhat etched back at the opening 40. The same applies to the gate wiring 9 immediately below the opening 20 (FIG. 1) in the first embodiment. This also affects the reliability of the insulating film 17 located immediately below.
- the opening formed on the gate wiring 9 be as narrow as possible.
- the opening 40 is provided locally, which is more desirable in this respect than the device 101.
- the opening 20 since the position of the opening 20 does not need to be aligned with a specific flat portion on the upper surface of the BPSG layer 11, the opening 20 is formed. There is an advantage that the alignment of the mask pattern is not required to be as precise as the opening 40, and the manufacturing is easy. In addition, since the contact area between the gate wiring 13 and the gate wiring 9 is low because the opening area of the opening 20 is large, good results are obtained with respect to the switching speed of the device.
- the opening 40 is formed. Then, it is preferable to selectively remove the BPSG layer 11 and the like. For this purpose, it is only necessary to simply replace the resist pattern as a shield capable of forming the openings 20 with a resist pattern capable of forming the openings 40.
- FIG. 40 is a plan view of another device 102 a according to the second embodiment in the gate wiring region GR.
- This device 102 a comprises a multilayer insulator including a BPSG layer 11, Opening 41 formed in the portion deposited on gate wiring 9 1 Force Characteristically different from device 102 in that it is formed by selecting the upper part of gate groove 6 . That is, the opening 41 is selectively formed at the position of the narrow flat portion in the upper surface of the BPSG layer 11 in FIG.
- the opening 41 is provided locally, but also the portion above the insulating film 17 and the portion above the gate electrode 7 are selected. Therefore, there is an advantage that deterioration of the insulating film 17 due to dry etching can be avoided.
- the opening 41 is formed instead of forming the opening 20. Then, it is preferable to selectively remove the BPSG layer 11 and the like. For this purpose, it is only necessary to replace the resist pattern as a shield capable of forming the openings 20 with a resist pattern capable of forming the openings 41.
- FIG. 41 is a plan view of the device 103 according to the third embodiment in the gate wiring region GR.
- FIGS. 42 and 43 are cross-sectional views taken along the line A—A and the line BB in FIG. 41, respectively.
- the device 103 is characteristically different from the device 101 of the first embodiment in that an n-type semiconductor layer 45 is formed instead of the n-type semiconductor layer 5.
- the n-type semiconductor layer 45 formed so as to surround the upper end UE of the gate groove 6 extends to a position overlapping with the insulating film 4.
- the connecting portion LE between the insulating film 17 formed relatively thin and the insulating film 4 formed thick is a portion where thermal stress remains.
- the insulating film 17 is locally thinner than its average thickness. It may be finished well. That is, it can be said that the connection portion LE is a weak point portion as the insulating film 17.
- the insulating film 17 is also finished thick at the connection portion LE. That is, the device 103 is configured to reinforce the weak point in the insulating film 17. As shown in FIGS.
- the n-type semiconductor layer 45 covers the entire region of the upper main surface of the semiconductor substrate 90 directly below the gate wiring 9. In addition, there is no gap between the adjacent gate grooves 6. As described above, the dry etching step for forming the opening 20 may cause deterioration of a portion of the insulating film 17 located immediately below the opening 20 in some cases.
- the n-type semiconductor layer 45 is preferably formed in a strip shape along the direction in which the gate grooves 6 are arranged. In this case, high accuracy is not required for the alignment of the mask pattern for forming the n-type semiconductor layer 45, so that the manufacturing becomes easy.
- the n-type semiconductor layer 45 is formed.
- a selective implant of arsenic may be performed to form.
- the resist layer 35 is preferably patterned so as to have an opening at a portion corresponding to the n-type semiconductor layer 23 and the n-type semiconductor layer 45.
- FIG. 44 is a plan view of the gate wiring region GR of another device 103 a according to the third embodiment.
- This device 103 a has an n-type semiconductor layer 46 instead of the n-type semiconductor layer 45.
- the n-type semiconductor layer 46 formed so as to surround the upper end portion UE of the gate groove 6 is different from the n-type semiconductor layer 45 in that the gate in the upper main surface of the semiconductor substrate 90 is different from the n-type semiconductor layer 45. It is not formed so as to cover the entire area corresponding directly below the wiring 9. However, like the n-type semiconductor layer 45, the n-type semiconductor layer 46 is formed so as to cover immediately below the connection portion LE. For this reason, similarly to the device 103, the weak points in the insulating film 17 are reinforced.
- the n-type semiconductor layer 46 is formed.
- a selective implant of arsenic may be performed to form.
- the resist layer 35 is preferably patterned so as to have an opening at a portion corresponding to the n-type semiconductor layer 23 and the n-type semiconductor layer 46.
- FIG. 45 is a cross-sectional view of the gate wiring region GR of the device 104 according to the fourth embodiment, taken along section line BB (FIG. 2).
- the device 104 is characteristically different from the device 101 of the first embodiment in that the p-type layer 3 is formed at the same depth as the p-type semiconductor layer 22. Therefore, the lower end BE of the longitudinal edge of the gate groove 6 is not covered with the p-type layer 3 but is directly surrounded by the n-type epitaxial layer 2.
- the lower end BE be covered with the p-type layer 3 as in the device 101 of the first embodiment.
- the impurity concentration in the p-type layer 3 is set to be the same as that of the p-type semiconductor layer 22, the p-type layer 3 and the n-type semiconductor layer 23 are formed simultaneously. It is possible to simplify the manufacturing process. At this time, the p-type layer 3 is the same as that the p-type semiconductor layer 22 is formed simply extending to the region of the p-type layer 3.
- the device 104 is suitable for applications where the required withstand voltage is not so high.
- the step of FIG. 9 in the method of manufacturing the device 101 is omitted, and in the steps of FIGS. 10 to 11, the p-type semiconductor layer 22 is It is good to expand to the area.
- the resist layer 33 shown in FIG. 10 is preferably formed so as to be selectively opened in regions corresponding to both the p-type semiconductor layer 22 and the p-type layer 3.
- FIG. 46 is a plan view of the gate wiring region GR of the device 105 of the fifth embodiment.
- FIGS. 47 and 48 are cross-sectional views taken along the line AA and the line BB in FIG. 46, respectively.
- A--A cutting line shown in Figure 46 and And the BB cutting line corresponds to the A-A cutting line and the BB cutting line in Fig. 3, respectively.
- the opening of the multilayer insulator including the BPSG layer 11 is not provided above the gate wiring 9, and the upper main surface of the semiconductor substrate 90 is formed so as to avoid the gate groove 6.
- the device 101 of the first embodiment differs from the device 101 of the first embodiment in that the gate wire 9 and the gate wire 10 are connected by a gate wire 93 provided on the insulating film 17 via the insulating film 17.
- the gate wiring 93 is made of the same material as the gate wirings 9 and 10, and is integrally continuous with the gate wirings 9 and 10. That is, the gate wirings 9, 10, and 93 constitute one continuous and continuous gate wiring 42.
- a gate wiring 49 is formed instead of the gate wiring 13 in the device 101.
- the gate wiring 49 is made of the same material as the source electrode 14, similarly to the gate wiring 13.
- the gate wiring 49 is electrically connected to the gate wiring 10 through the opening 20.
- the gate wiring is arranged so as to avoid the upper end UE of the gate groove 6, the gate insulating film in the upper end UE is caused by the application of the gate voltage.
- the concentration of the electric field generated in the insulating film 8 and the insulating film 17 is reduced or eliminated.
- the breakdown voltage of the device 104 and the yield as a product are improved.
- the gate wiring 9 is not connected to the gate wiring 10 through an opening provided in the BPSG layer 11 or the like, but is connected integrally to the gate wiring 10 through the gate wiring 93. Therefore, there is obtained an advantage that the electric resistance between the gate wiring 9 and the gate wiring 10 is low and the switching speed of the device is improved. Further, since no opening is formed above the gate wiring 9, there is an advantage that deterioration of the insulating film 17 due to dry etching can be avoided.
- the device 101 of the first embodiment does not require the alignment of the mask pattern required for forming the gate wiring 93 and the gate groove 6 between them. Therefore, there is an advantage that manufacturing is easy. In addition, since the connecting portion LE between the insulating film 4 and the insulating film 17 is not covered with the gate wiring 93, there is an advantage that the breakdown voltage and reliability of the device are improved.
- the polysilicon layer 38 is selectively etched while the resist pad 50 is used as a shield.
- the gate electrode 7 and the gate wiring 42 are formed.
- the etching is controlled so that the upper surface of the gate electrode 7 is not positioned above the upper main surface of the semiconductor substrate 90 near the upper end UE.
- a thermal oxide film is first formed on the entire surface of the gate electrode 7 and the gate wiring 42.
- the insulating film 16 covering the surface of the gate electrode 7 and the insulating film 18 covering the surface of the gate wiring 42 are formed to a thickness of, for example, about 20 to 30 nm.
- the insulating film 1 6, 1 8 by using the CVD method, then t the BPSG layer 1 1 is formed, on the BPSG layer 1 1, the oxide film as an insulating film 1 9, CVD
- the film is formed to have a thickness of, for example, about 100 nm.
- the insulating films 16, 17, 18, the BPSG layer 11, and the insulating film 19 form a multilayer insulator having a three-layer structure.
- the multilayer insulator is selectively etched using a resist pattern (not shown). This selective etching is performed using a wet method and a dry method. As a result, an opening 21 and an opening for connecting the source electrode 14 and the semiconductor substrate 90 are formed in the multilayer insulator.
- an A-Si layer is deposited so as to fill each opening formed in the multilayer insulator and cover the upper surface of the multilayer insulator.
- the deposition of the A-Si layer is performed by using, for example, a sputtering method.
- a source electrode 14 and a gate wiring 49 are formed.
- a drain electrode 15 is formed on the surface of the n-type substrate layer 1, that is, on the lower main surface of the semiconductor substrate 90, whereby the device 1.05 is completed.
- the formation of the drain electrode 15 is performed by, for example, depositing a Ti / Ni / Au alloy on the surface of the n-type substrate layer 1 using a sputtering method.
- the device 100 is formed by combining the conventionally known technologies such as the photolithography technology, the ion implantation technology, the CVD method, and the thermal oxidation treatment. 5 can be easily manufactured.
- FIG. 57 is a plan view of the gate wiring region GR of another device 105a according to the fifth embodiment.
- FIG. 58 is a cross-sectional view taken along the line BB in FIG.
- a cross-sectional view taken along the line AA in FIG. 57 is shown in the same manner as FIG.
- an opening 20 is provided in the BPSG layer 11 or the like also on the gate wiring 9 included in the gate wiring 42, and the gate wiring 9 and the gate wiring 10 are connected to each other.
- the device is characteristically different from the device 105 in that it is connected not only through the gate wire 93 but also through the gate wire 13 filling the openings 20 and 21. Since the gate wiring 9 and the gate wiring 10 are connected through both the paths of the gate wiring 93 and the gate wiring 13, the electrical resistance between them can be kept low. As a result, there is an advantage that the switching speed of the device is improved.
- the steps of FIGS. 59 and 60 may be performed after the steps of FIGS. 53 and 54 in the method of manufacturing the apparatus 105.
- the steps of FIGS. 59 (A-A section) and 60 (B-B section) first, the multilayer insulator is selectively etched using a resist pattern (not shown). This selective etching is performed using a wet method and a dry method. As a result, openings 20 and 21 and openings for connecting source electrode 14 and semiconductor substrate 90 are formed in the multilayer insulator.
- an A-Si layer is deposited so as to fill each opening formed in the multilayer insulator and cover the upper surface of the multilayer insulator.
- the deposition of the A-Si layer is performed by using, for example, a sputtering method.
- the source electrode 14 and the gate wiring 13 are formed as shown in FIG. 58 by patterning the AutoSi layer.
- the drain electrode 15 is formed on the surface of the n-type substrate layer 1, that is, on the lower main surface of the semiconductor substrate 90, whereby the device 101 is completed.
- the formation of the drain electrode 15 is performed, for example, by depositing a Ti / Ni / Au alloy on the surface of the n-type substrate layer 1 by using a sputtering method.
- FIG. 61 is a plan view of the gate wiring region GR of the device 106 of the sixth embodiment.
- FIGS. 62 and 63 are cross-sectional views taken along the line AA and the line BB in FIG. 61, respectively.
- the device 106 according to the fifth embodiment differs from the device 103 according to the fifth embodiment in that an n-type semiconductor layer 45 is formed instead of the n-type semiconductor layer 5 as in the device 103 according to the third embodiment. Characteristically different from 05.
- the insulating film 17 is also finished thick at the connecting portion LE between the insulating film 17 and the insulating film 4.
- the device 106 has an advantage that the weak point in the insulating film 17 is reinforced.
- the device 106 unlike the device 103, since the top of the connection LE is covered with the gate wiring 42, the advantage of reinforcing the connection LE with the n-type semiconductor layer 45 is more advantageous. Even bigger.
- the n-type semiconductor layer 45 is formed in the adjacent gate groove so as to cover the entire area corresponding to the area directly below the gate wiring 9 in the upper main surface of the semiconductor substrate 90. There is no gap between them. Therefore, there is an advantage that the deterioration of the insulating film 17 due to dry etching is compensated for in a region corresponding to the region immediately below the gate wiring 9. Further, as shown in FIG. 61, by forming the n-type semiconductor layer 45 in a strip shape along the arrangement direction of the gate grooves 6, it is possible to facilitate the alignment of the mask pattern in the manufacturing process. Become.
- the n-type semiconductor layer 45 is formed.
- a selective implant of arsenic may be performed to form.
- the resist layer is formed so as to have an opening at a portion corresponding to the n-type semiconductor layer 23 and the n-type semiconductor layer 45. It is good to carry out the patterning of 35.
- FIG. 64 is a cross-sectional view of the gate wiring region GR of the device 107 of the seventh embodiment, taken along the line BB (FIG. 2).
- the device 107 is similar to the device 104 of the fourth embodiment except that the p-type layer 3 is formed at the same depth as the p-type semiconductor layer 22 similarly to the device 104 of the fourth embodiment. Characteristically different from 105. Therefore, the lower end BE of the longitudinal edge of the gate groove 6 is not covered by the p-type layer 3 but is directly surrounded by the n-type epitaxial layer 2.
- This device 107 also has the same advantages as the device 104. That is, if the impurity concentration in the P-type layer 3 is set to be the same as that of the P-type semiconductor layer 22, the p-type layer 3 and the n-type semiconductor layer 23 can be simultaneously formed. The advantage is that the process is simplified.
- the step of FIG. 9 in the method of manufacturing the device 101 is omitted, and in the steps of FIG. 10 to FIG. ) It is good to form it so as to extend to the area of the p-layer 3.
- the resist layer 33 shown in FIG. 10 is preferably formed so as to be selectively opened in regions corresponding to both the p-type semiconductor layer 22 and the p-type layer 3.
- the steps from 49 to 56 are preferably performed.
- FIG. 65 is a plan view of the gate wiring region GR of the device 108 of the eighth embodiment.
- FIG. 66 is a cross-sectional view taken along the line AA in FIG. 65.
- the device 108 is characteristically different from the device 101 of the first embodiment in that the n-type semiconductor layer 5 is not formed. Since the n-type semiconductor layer 5 is not formed, the effect of forming the gate insulating film 8 and the insulating film 17 in the upper end portion UE of the gate groove 6 thick cannot be obtained. However, similarly to the device 101, the gate The wiring is arranged so as to avoid the upper end UE.
- the effect of reducing or eliminating the concentration of the electric field generated in the gate insulating film 8 and the insulating film 17 in the upper end portion UE by the application of the gate voltage is appropriately obtained.
- the n-type semiconductor layer 23 is formed and the n-type semiconductor layer 5 is formed in the steps of FIGS. 13 to 15 in the method of manufacturing the device 101.
- a selective implant of arsenic should be performed.
- the resist layer 35 is preferably patterned so as to have an opening only at a portion corresponding to the n-type semiconductor layer 23.
- FIG. 67 is a plan view of a gate wiring region GR of another device 108a according to the eighth embodiment.
- FIG. 68 is a cross-sectional view taken along the line AA in FIG. 67.
- the device 108 a is characteristically different from the device 105 of the fifth embodiment in that the n-type semiconductor layer 5 is not formed.
- the gate wiring is disposed so as to avoid the upper end UE, so that the gate voltage is generated in the gate insulating film 8 and the insulating film 17 in the upper end UE by application of the gate voltage. The effect of reducing or eliminating the concentration of the electric field can be obtained accordingly.
- the resist layer 35 is preferably patterned so as to have an opening only in a portion corresponding to the n-type semiconductor layer 23.
- an n-channel type M0SFET is taken as an example.
- the present invention can be similarly applied to a p-channel type M0SFET, and has the same effect. .
- the present invention can be applied to a device having no p-type layer 3 although the withstand voltage is inferior. Even in the device configured in this way, the gate wiring avoids the upper end UE. As long as the gate voltage is applied, the effect of reducing or eliminating the concentration of the electric field generated in the gate insulating film 8 and the insulating film 17 at the upper end UE by the application of the gate voltage can be obtained accordingly.
- the insulating film 4 thicker than the insulating film 17 was formed between the p-type layer 3 and the gate wiring 10.
- the present invention can be applied to a device configured so that insulation between the p-type layer 3 and the gate wiring 10 is maintained by the insulating film 17.
- the gate insulating film 8 and the insulating film 17 at the upper end UE are applied by the application of the gate voltage. The effect of reducing or eliminating the concentration of the generated electric field can be obtained accordingly.
- the M0SFET is taken as an example.
- the present invention can be similarly applied to an insulated gate semiconductor device such as an IGBT other than the M0SFET.
- an IGBT is realized. That is, the present invention can be generally applied to an insulated gate semiconductor device in which a gate electrode facing a channel region with an insulating film interposed is buried in a trench.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Electrodes Of Semiconductors (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69729963T DE69729963T2 (de) | 1997-08-29 | 1997-08-29 | Halbleiterbauelement mit isoliertem gatter und verfahren zu deren herstellung |
PCT/JP1997/003040 WO1999012214A1 (fr) | 1997-08-29 | 1997-08-29 | Dispositif a semi-conducteur a grille isolee et procede de fabrication |
EP97937855A EP1009035B1 (en) | 1997-08-29 | 1997-08-29 | Insulated gate semiconductor device and method for manufacturing the same |
JP51655099A JP3299283B2 (ja) | 1997-08-29 | 1997-08-29 | 絶縁ゲート型半導体装置とその製造方法 |
US09/485,702 US6285058B1 (en) | 1997-08-29 | 1997-08-29 | Insulated gate semiconductor device and method of manufacturing the same |
KR1020007001841A KR100334445B1 (ko) | 1997-08-29 | 1997-08-29 | 절연 게이트형 반도체장치와 그 제조방법 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1997/003040 WO1999012214A1 (fr) | 1997-08-29 | 1997-08-29 | Dispositif a semi-conducteur a grille isolee et procede de fabrication |
Publications (1)
Publication Number | Publication Date |
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WO1999012214A1 true WO1999012214A1 (fr) | 1999-03-11 |
Family
ID=14181048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1997/003040 WO1999012214A1 (fr) | 1997-08-29 | 1997-08-29 | Dispositif a semi-conducteur a grille isolee et procede de fabrication |
Country Status (6)
Country | Link |
---|---|
US (1) | US6285058B1 (ja) |
EP (1) | EP1009035B1 (ja) |
JP (1) | JP3299283B2 (ja) |
KR (1) | KR100334445B1 (ja) |
DE (1) | DE69729963T2 (ja) |
WO (1) | WO1999012214A1 (ja) |
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JP2003258253A (ja) * | 2001-12-26 | 2003-09-12 | Toshiba Corp | 絶縁ゲート型バイポーラトランジスタ |
JP2003258254A (ja) * | 2002-03-07 | 2003-09-12 | Mitsubishi Electric Corp | 絶縁ゲート型半導体装置及びゲート配線構造の製造方法 |
JP2004140086A (ja) * | 2002-10-16 | 2004-05-13 | Toyota Central Res & Dev Lab Inc | トレンチゲート型半導体装置 |
JP2004207289A (ja) * | 2002-12-24 | 2004-07-22 | Toyota Motor Corp | 埋設ゲート型半導体装置 |
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JP2003008018A (ja) * | 2001-06-20 | 2003-01-10 | Denso Corp | 半導体装置及びその製造方法 |
JP2003258253A (ja) * | 2001-12-26 | 2003-09-12 | Toshiba Corp | 絶縁ゲート型バイポーラトランジスタ |
JP2003258254A (ja) * | 2002-03-07 | 2003-09-12 | Mitsubishi Electric Corp | 絶縁ゲート型半導体装置及びゲート配線構造の製造方法 |
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JP2018074126A (ja) * | 2016-11-04 | 2018-05-10 | トヨタ自動車株式会社 | 半導体装置 |
WO2019017447A1 (ja) * | 2017-07-21 | 2019-01-24 | 株式会社デンソー | 半導体装置およびその製造方法 |
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Also Published As
Publication number | Publication date |
---|---|
JP3299283B2 (ja) | 2002-07-08 |
EP1009035A1 (en) | 2000-06-14 |
KR20010023212A (ko) | 2001-03-26 |
DE69729963T2 (de) | 2005-08-25 |
KR100334445B1 (ko) | 2002-05-04 |
US6285058B1 (en) | 2001-09-04 |
EP1009035B1 (en) | 2004-07-21 |
DE69729963D1 (de) | 2004-08-26 |
EP1009035A4 (en) | 2003-01-08 |
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