WO2005081304A1 - 電界効果トランジスタ - Google Patents
電界効果トランジスタ Download PDFInfo
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- WO2005081304A1 WO2005081304A1 PCT/JP2005/002712 JP2005002712W WO2005081304A1 WO 2005081304 A1 WO2005081304 A1 WO 2005081304A1 JP 2005002712 W JP2005002712 W JP 2005002712W WO 2005081304 A1 WO2005081304 A1 WO 2005081304A1
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- 230000005669 field effect Effects 0.000 title claims abstract description 22
- 229910002704 AlGaN Inorganic materials 0.000 claims abstract description 35
- 239000004065 semiconductor Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 22
- 230000015556 catabolic process Effects 0.000 description 17
- 230000005684 electric field Effects 0.000 description 17
- 239000000758 substrate Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- 239000002184 metal Substances 0.000 description 7
- 238000005530 etching Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000001629 suppression Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001451 molecular beam epitaxy Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000005533 two-dimensional electron gas Effects 0.000 description 1
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
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/402—Field plates
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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
- H01L29/40—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
-
- 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
- H01L29/778—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface
- H01L29/7786—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT
- H01L29/7787—Field effect transistors with two-dimensional charge carrier gas channel, e.g. HEMT ; with two-dimensional charge-carrier layer formed at a heterojunction interface with direct single heterostructure, i.e. with wide bandgap layer formed on top of active layer, e.g. direct single heterostructure MIS-like HEMT with wide bandgap charge-carrier supplying layer, e.g. direct single heterostructure MODFET
-
- 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
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/20—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only AIIIBV compounds
- H01L29/2003—Nitride compounds
Definitions
- the present invention relates to a field effect transistor using an m-nitride semiconductor.
- Fig. 1 shows a conventional heterojunction field effect transistor (Hetero-Junction).
- HJFET Field Effect Transistor
- an A1N buffer layer 111, a GaN channel layer 112, and an AlGaN electron supply layer 113 are stacked on a sapphire substrate 109 in this order. Further, a source electrode 101 and a drain electrode 103 are formed on the AlGaN electron supply layer 113, and these electrodes 101 and 103 are in ohmic contact with the AlGaN electron supply layer 113. In addition, a gate electrode 102 is formed between the source electrode 101 and the drain electrode 103, and the gate electrode 102 is in Schottky contact with the AlGaN electron supply layer 113. On the uppermost layer of the HJFET, a SiN film 121 is formed as a surface protection film.
- FIG. 2 is a graph showing the relationship between the thickness of the surface protective film SiN, the amount of current change due to Collabs, and the gate breakdown voltage.
- the Collabs is a phenomenon in which, when the HJFET performs a large signal operation, a negative charge is accumulated on the surface due to the response of the surface trap, and the maximum drain current is suppressed.
- the Collabs becomes remarkable, the drain current at the time of large signal operation is suppressed, and the saturation output decreases.
- the SiN film is formed on the surface of the device in which the Collabs is remarkable as described above, the piezoelectric polarization charge in AlGaN increases due to the stress of the SiN film, which has the effect of canceling the surface negative charge. Can be reduced.
- the amount of collapse is 60% or more.
- the amount of collabs can be suppressed to 10% or less.
- the surface negative charge has the effect of reducing the electric field concentration between the gate and the drain and increasing the gate breakdown voltage. For this reason, when the surface negative charges are canceled by thickening the SiN film, the electric field concentration between the gate and the drain becomes remarkable, and the gate breakdown voltage decreases. As a result, as shown in FIG. 2, there is a trade-off between the Collabs and the gate breakdown voltage due to the difference in the thickness of the SiN film.
- FIG. 3 is a cross-sectional structural view of another conventional HJFET in which a field plate portion is added to solve the above-described problem of the HJFET.
- Such prior art HJFETs are available for $ 200 a year from Electronics Letters.
- This HJFET is configured on a substrate 110 made of SiC or the like.
- a buffer layer 111 serving as a semiconductor layer is formed on the substrate 110.
- a GaN channel layer 112 is formed on this buffer layer 111.
- An AlGaN electron supply layer 113 is formed on the channel layer.
- a source electrode 101 and a drain electrode 103 which are in ohmic contact are provided.
- a gate electrode 102 having a field plate portion 105 projecting like an eave on the drain electrode 103 side and having a Schottky contact.
- the surface of the electron supply layer 113 is covered with a SiN film 121, and the SiN film 121 exists immediately below the field plate portion 105.
- the HJFET to which the field plate is added as described above, it is possible to improve the trade-off between the Collabs and the gate breakdown voltage.
- the electric field near the gate is relieved by the field plate to improve the gate breakdown voltage
- the surface potential is modulated by the field plate to maximize the drain current. Can be shed.
- a SiN film is formed on the surface of the device where Collabs is remarkable.
- the piezo-polarized charge in AlGaN increases due to the stress of the SiN film, which has the effect of canceling the surface negative charge.
- the gate breakdown voltage is reduced.
- the effect of suppressing the collapse increases as the size of the field plate increases, the effect of suppressing the collapse can be further obtained by increasing the size of the field plate.
- the size of the field plate exceeds 70% of the distance between the gate electrode and the drain electrode, the gate withstand voltage is determined by the electric field concentration between the field plate and the drain electrode. Tend. Therefore, there is a limit to the suppression of Collabs by increasing the size of the field plate.
- An object of the present invention is to provide a field effect transistor capable of achieving both gate breakdown voltage and Collabs suppression required for realizing operation at a higher voltage.
- a field effect transistor of the present invention comprises a group III nitride semiconductor layer structure including a heterojunction, and a source electrode and a drain electrode formed on the semiconductor layer structure so as to be separated from each other.
- a field effect transistor having a gate electrode formed between the source electrode and the drain electrode, and an insulating film formed on the semiconductor layer structure, wherein the gate electrode is located on the drain electrode side.
- a field plate portion protruding in the shape of an eave, and formed on the insulating film, wherein a thickness of a portion of the insulating film located between the field plate portion and the semiconductor layer structure has a thickness of That the thickness gradually changes from the gate electrode toward the drain electrode.
- the field effect transistor of the present invention by providing the field plate portion, when a high reverse voltage is applied between the gate and the drain, an electric field is applied to the end of the gate electrode on the drain electrode side. Is reduced by the action of the field plate portion, thereby improving the gate withstand pressure. Furthermore, at the time of a large signal operation, the surface potential near the gate is particularly effectively modulated by the field plate portion, so that it is possible to suppress the occurrence of Collabs due to the response of the surface trap.
- the thickness of the insulating film in the region near the gate electrode where the electric field is most concentrated that is, the thickness of the insulating film immediately below the field plate portion Force Direction from gate electrode to drain electrode ,
- the thickness of the insulating film in that region becomes thinner than that of the other regions, and in this region, both the surface negative charge and the field plate part work.
- the electric field concentration can be reduced, and the gate breakdown voltage can be improved.
- the surface negative charge is a factor that causes collabs.However, the surface negative charge is generated near the gate electrode, and the insulating film in the area near the gate electrode is relatively thin. Since the surface potential can be modulated effectively, it is possible to suppress Collabs.
- the field-effect transistor of the present invention it is possible to achieve both the gate withstand voltage and the suppression of the Collabs more satisfactorily, and it is possible to realize an operation at a higher voltage than before.
- the semiconductor layer structure may have an AlGaN / GaN heterostructure.
- the configuration may be such that the thickness of the portion of the insulating film changes stepwise, or the configuration may be such that the thickness of the portion of the insulating film continuously changes.
- the insulating film is formed of a SiON film, a SiO film or a SiN film, or a film formed of a SiN film and a SiO film.
- a configuration may be adopted in which a drain field plate electrode connected to the drain electrode is provided on the insulating film between the gate electrode and the drain electrode. Les ,. According to this configuration, the electric field concentration at the end of the drain electrode can be reduced by the drain field plate electrode, so that the withstand voltage characteristics can be improved and a higher Operation at a voltage becomes possible. In addition, since the effect of the decrease in the gain is greater on the field plate on the gate electrode side, by providing a drain field plate electrode and shortening the length of the field plate on the gate electrode side, the breakdown voltage characteristics can be maintained. It is also possible to improve the gain.
- FIG. 1 is a sectional structural view of a conventional heterojunction field effect transistor.
- FIG. 2 is a graph showing a relationship between a thickness of a surface protective film SiN, a current change amount due to Collabs, and a gate breakdown voltage.
- FIG. 3 is a sectional structural view of another conventional HJFET to which a field plate portion is added.
- FIG. 4 is a sectional structural view of an HJFET according to the first embodiment of the present invention.
- FIG. 5 is a sectional structural view of an HJFET according to a second embodiment of the present invention.
- FIG. 6 is a sectional structural view of a modification of the HJFET shown in FIG. 5.
- FIG. 7 is a sectional structural view of an HJFET according to a third embodiment of the present invention.
- FIG. 8 is a sectional structural view of a modification of the HJFET shown in FIG. 7.
- FIG. 9 is a sectional structural view of a modification of the HJFET shown in FIG. 7.
- FIG. 10 is a sectional structural view of a modified example of the HJFET shown in FIG. 7.
- FIG. 4 is a sectional structural view of the HJFET according to the first embodiment of the present invention.
- the HJFET of the present embodiment is configured on a substrate 10 made of SiC or the like.
- a buffer layer 11 serving as a semiconductor is formed on a substrate 10.
- a GaN channel layer 12 is formed on this buffer layer 11.
- an AlGaN electron supply layer 13 is formed on the GaN channel layer 12.
- a source electrode 1 and a drain electrode 3 which are in ohmic contact are provided.
- a field plate portion 5 protruding like an eave on the drain electrode 3 side.
- a gate electrode 2 with which sexual contact is made is provided.
- the surface of the AlGaN electron supply layer 13 is covered with a SiON film 23 as an insulating film, and the SiON film 23 (field plate layer 23a) immediately below the field plate 5 extends from the gate electrode 2 side to the drain electrode 3 side. It is thicker in a step-like shape.
- the HJFET of the present embodiment is formed as follows.
- a molecular beam epitaxy (Molecular) is formed on a substrate 10 made of SiC or the like.
- the semiconductor layer thus formed is, in order from the substrate 10 side, a buffer layer 11 made of undoped A1N (film thickness 20 ⁇ m), an undoped GaN force, a channel layer 12 made of undoped A2N (film thickness 2 ⁇ m), and an undoped By Al Ga
- an element isolation mesa (not shown) is formed by removing a part of the epitaxial layer structure by etching until the GaN channel layer 12 is exposed. Subsequently, a source electrode 1 and a drain electrode 3 are formed on the AlGaN electron supply layer 13 by evaporating a metal such as Ti / Al, and ohmic contact is obtained by annealing at 650 ° C. .
- a SiON film 23 (film thickness 150 nm) is formed by a plasma CVD method or the like.
- the thickness of the field plate layer 23a which is the portion of the SiON film 23 that is covered by the field plate portion 5, is changed into a step-like shape by etching and completely removed and exposed on the exposed AlGaN electron supply layer 13 such as Ni / Au.
- a metal is deposited to form a gate electrode 2 of a Schottky contact having a field plate portion 5.
- the thickness of the field plate layer 23a is changed stepwise in three steps so that the thickness gradually increases in the direction from the gate electrode 2 toward the drain electrode 3. ing.
- the field plate portion 5 As in the present embodiment, when a high reverse voltage is applied between the gate and the drain, the electric field applied to the end of the gate electrode 2 on the side of the drain electrode 3 is reduced by the field plate. Gate voltage is improved by being alleviated by the function of the part 5. Furthermore, since the surface potential near the gate is particularly effectively modulated by the field plate portion 5 at the time of large signal operation, it is possible to suppress the occurrence of Collabs due to the response of the surface trap. According to the present embodiment, according to the present embodiment, according to the present embodiment, the SiON film 23 in the region near the gate electrode 2 where the electric field is most concentrated, that is, the field plate layer which is the SiON film 23 immediately below the field plate portion 5.
- the 23a By making the 23a thinner than the SiON film 23 in other regions, it is possible to reduce the electric field concentration and improve the gate withstand voltage in this region by the action of both the surface negative charge and the field plate portion 5. .
- the surface negative charge is a factor causing collabs, the surface negative charge is generated immediately near the gate electrode 2 and the field plate layer 23a is relatively thin, so that the field plate portion 5 effectively reduces the surface. Since the potential can be modulated, it is possible to suppress Collabs.
- the thickness of the portion where the film thickness of the field plate layer 23a is thinnest is the same as that of FIG. It is preferable that the dimension in the direction extending between the gate electrode 2 and the drain electrode 3 is 0.3 am or more. Further, it is preferable that the dimension of the portion where the film thickness of the field plate layer 23a is the smallest is 0.5 / im or more. Further, the overall dimension of the field plate portion 5 extending to the drain electrode 3 side is preferably 0.5 / im or more, and more preferably the overall dimension of the field plate portion 5 is 0.7 ⁇ or more. . Further, it is preferable that the end of the field plate portion 5 is located at a position that does not overlap with the drain electrode 3.
- the gate withstand voltage is determined by the concentration of the electric field between the field plate portion 5 and the drain electrode 3.
- the gate breakdown voltage tends to decrease.
- the dimension of the field plate portion 5 be 70% or less of the distance between the gate electrode 2 and the drain electrode 3.
- the thickness of the field plate layer 23 a made of the Si ⁇ N film 23 immediately below the field plate portion 5 gradually increases as the force moves from the gate electrode 2 to the drain electrode 3.
- the thickness is changed in three stages as described above, the same effect can be obtained if the thickness is changed in at least two stages.
- an example in which the Si ⁇ N film is used as the insulating film constituting the field plate layer 23a has been described, but instead of the SiON film, a SiN film, a SiO film, or a SiN film and a Si ⁇ 2 film are used. The same effect can be obtained when a laminated film with
- FIG. 5 is a sectional structural view of an HJFET according to a second embodiment of the present invention.
- the HJFET of the present embodiment is configured on a substrate 10 made of SiC or the like.
- a semiconductor layer and a buffer layer 11 are formed on this buffer layer 11.
- a GaN channel layer 12 is formed on this buffer layer 11.
- an AlGaN electron supply layer 13 is formed on the GaN channel layer 12.
- a source electrode 1 and a drain electrode 3 which are in ohmic contact are provided.
- a gate electrode 2 having a field plate portion 5 protruding like an eave on the drain electrode 3 side and having a Schottky contact.
- the surface of the AlGaN electron supply layer 13 is covered with a Si ⁇ N film 23 as an insulating film, and the SiON film 23 (field plate layer 23a) immediately below the field plate 5 is formed from the gate electrode 2 side to the drain electrode 3 side. It is continuously thicker toward the side.
- the HJFET of the present embodiment is formed as follows.
- a semiconductor is grown on a substrate 10 made of SiC or the like by, for example, a molecular beam epitaxy (MBE) growth method.
- the semiconductor layer formed in this manner includes, in order from the substrate 10, a buffer layer 11 made of undoped A1N (film thickness 20 nm), a channel layer 12 made of undoped GaN (film thickness 2 ⁇ m), and an undoped AlGaN supply layer 13 (thickness 2
- a part of the epitaxial layer structure is etched and removed until the GaN channel layer 12 is exposed, thereby forming an element isolation mesa (not shown).
- a source electrode 1 and a drain electrode 3 are formed on the AlGaN electron supply layer 13 by evaporating a metal such as Ti / Al, and ohmic contact is obtained by annealing at 650 ° C. .
- an SiON film 23 (film thickness 150 nm) is formed by a plasma CVD method or the like.
- a field plate layer 23a whose thickness is continuously increased from the gate electrode 2 side to the drain electrode 3 side is formed.
- a metal such as Ni / Au is vapor-deposited on the exposed AlGaN electron supply layer 13 to form a Schottky contact gate electrode 2 having a finolole plate 5. Form.
- the HJFET shown in FIG. 5 is manufactured.
- the field plate portion 5 when a high reverse voltage is applied between the gate and the drain, an electric field applied to the end of the gate electrode 2 on the drain electrode 3 side is generated.
- the gate withstand voltage is improved by being alleviated by the function of the field plate portion 5.
- the surface potential near the gate is particularly effectively modulated by the field plate portion 5, so that the occurrence of Collabs due to the response of the surface trap can be suppressed.
- the SiON film 23 in the region near the gate electrode 2 where the electric field is most concentrated is, the field plate layer 23a, which is the Si ⁇ N film 23 immediately below the field plate portion 5, is By making the film thinner than the Si ⁇ N film 23, it is possible to reduce the electric field concentration and improve the gate withstand voltage in this region by the action of both the surface negative charge and the field plate portion 5.
- the surface negative charge is a cause of the Collabs, but the surface negative charge is generated immediately near the gate electrode 2 and the field plate layer 23a is relatively thin, so that the surface potential is effectively reduced by the field plate portion 5. Can be modulated, so that the collapse can be suppressed.
- the gate electrode 2 and the drain electrode 3 in the region where the thickness of the field plate layer 23a changes are formed.
- the dimension in the extending direction be 0.3 / im or more.
- the dimension of the region where the film thickness of the field plate layer 23a changes is 0.5 ⁇ m or more.
- the end portion of the field plate portion 5 is located at a position that does not overlap with the drain electrode 3. Further, for the reason described in the first embodiment, it is preferable that the dimension of the field plate portion 5 be 70% or less of the distance between the gate electrode 2 and the drain electrode 3.
- the thickness of the field plate layer 23a is changed in at least a part of the region immediately below the field plate portion 5 by changing the thickness of the field plate layer 23a over the entire region immediately below the field plate portion 5.
- a force in which the field plate portion 5 projects in an eaves shape to the drain electrode 3 side is formed by the source plate 1 It is good also as a structure which overhangs to the side like an eaves.
- an SiON film is used as an insulating film constituting the field plate layer 23a is shown. Instead of the SiON film, a SiN film, a SiO film or a SiN film, or a SiN film and a Si ⁇ film are used. Similar effects can be obtained when a laminated film is used.
- FIG. 6 is a sectional structural view of a modification of the HJFET shown in FIG.
- the field plate layer 23a of the present embodiment has an extremely thin force S at the edge of the gate electrode 2 , and as shown in FIG. 6 , a certain thickness is secured in the field plate layer 23a near the gate electrode 2. It is okay to change the thickness in the area below the field plate part 5. With such a configuration, it is possible to improve the gain by reducing the capacitance in the vicinity of the gate electrode 2 and to improve the breakdown voltage due to the destruction of the field plate layer 23a.
- the thickness of the field plate layer 23a near the gate electrode is preferably 10 nm or more, and more preferably 50 nm or more.
- FIG. 7 is a cross-sectional structure diagram of an HJFET according to the third embodiment of the present invention.
- the HJFET of the present embodiment is configured on a substrate 10 made of SiC or the like.
- a buffer layer 11 serving as a semiconductor is formed on a substrate 10.
- a GaN channel layer 12 is formed on this buffer layer 11.
- an AlGaN electron supply layer 13 is formed on the GaN channel layer 12.
- a source electrode 1 and a drain electrode 3 which are in ohmic contact are provided.
- a gate electrode 2 having a field plate portion 5 protruding like an eave on the drain electrode 3 side and having a Schottky contact.
- the surface of the AlGaN electron supply layer 13 is covered with a Si ⁇ N film 23 as an insulating film, and the SiON film 23 (field plate layer 23a) immediately below the field plate 5 is formed from the gate electrode 2 side to the drain electrode 3 side. It is continuously thicker toward the side.
- a drain field plate electrode 6 connected to the drain electrode 3 is provided on the SION film 23 between the gate electrode 2 and the drain electrode 3.
- the HJFET of the present embodiment is formed as follows.
- a semiconductor is grown on a substrate 10 made of SiC or the like by, for example, a molecular beam epitaxy (MBE) growth method.
- the semiconductor layers formed in this manner are arranged in order from the substrate 10 side.
- Buffer layer 11 made of undoped A1N (film thickness 20 nm)
- channel layer 12 made of undoped GaN (film thickness 2 ⁇ m)
- AlGaN supply layer 13 made of undoped AlGaN
- a part of the epitaxial layer structure is removed by etching until the GaN channel layer 12 is exposed, thereby forming an element isolation mesa (not shown).
- a source electrode 1 and a drain electrode 3 are formed on the AlGaN electron supply layer 13 by evaporating a metal such as Ti / Al, and ohmic contact is obtained by annealing at 650 ° C. .
- a SiON film 23 (film thickness 150 nm) is formed by a plasma CVD method or the like.
- a field plate layer 23a whose thickness is continuously increased from the gate electrode 2 side to the drain electrode 3 side is formed.
- a part of the AlGaN electron supply layer 13 is exposed, and a metal such as Ni / Au is vapor-deposited on the exposed AlGaN electron supply layer 13 to form a Schottky contact gate electrode 2 having a finolole plate 5.
- a part of the SiON film 23 on the drain electrode 3 is removed by etching, and a metal such as Ti / Au is deposited to form a drain field plate electrode 6.
- the HJFET shown in FIG. 7 is manufactured.
- the electric field concentration at the end of the drain electrode 3 can be reduced by the drain field plate electrode 6, so that the gate electrode 2 side as in the first and second embodiments described above.
- the drain field plate electrode 6 As compared with the configuration having only the field plate 5 of the first embodiment, it is possible to improve the withstand voltage characteristic and to operate at a higher voltage. Further, since the effect on the gain reduction is greater in the field plate 5 on the side of the gate electrode 2, by providing the drain field plate electrode 6 and shortening the length of the field plate 5 as in the present embodiment. It is also possible to improve the gain while maintaining the breakdown voltage characteristics.
- FIG. 8 is a sectional structural view of a modification of the HJFET shown in FIG.
- the drain field plate electrode 6 of the present embodiment has a Si ⁇ N film 23 (field plate layer 23a) immediately below the field plate 5 in a step-like shape from the gate electrode 2 side to the drain electrode 3 side.
- FIG. 9 shows a cross-sectional structure of another modification of the HJFET shown in FIG.
- the drain field of this embodiment The rate electrode 6 can be similarly applied to an HJFET in which the field plate layer 23a near the gate electrode 2 has a certain thickness as shown in FIG.
- the drain field plate electrode 6 can be similarly applied to an HJFET in which the thickness of the field plate layer 23a does not change.
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Abstract
Description
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JP2006510264A JP4888115B2 (ja) | 2004-02-20 | 2005-02-21 | 電界効果トランジスタ |
US10/588,775 US20070164326A1 (en) | 2004-02-20 | 2005-02-21 | Field effect transistor |
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JP2004-044459 | 2004-02-20 | ||
JP2004044459 | 2004-02-20 |
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007096203A (ja) * | 2005-09-30 | 2007-04-12 | Sanken Electric Co Ltd | 2次元キャリアガス層を有する電界効果トランジスタ |
JP2008243848A (ja) * | 2007-03-23 | 2008-10-09 | Sanken Electric Co Ltd | 半導体装置 |
JP2011114267A (ja) * | 2009-11-30 | 2011-06-09 | Sanken Electric Co Ltd | 半導体装置 |
JP2011138973A (ja) * | 2009-12-29 | 2011-07-14 | New Japan Radio Co Ltd | 窒化物半導体装置 |
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JP2007096203A (ja) * | 2005-09-30 | 2007-04-12 | Sanken Electric Co Ltd | 2次元キャリアガス層を有する電界効果トランジスタ |
US8969919B2 (en) | 2006-09-20 | 2015-03-03 | Fujitsu Limited | Field-effect transistor |
JP2008243848A (ja) * | 2007-03-23 | 2008-10-09 | Sanken Electric Co Ltd | 半導体装置 |
JP2012517699A (ja) * | 2009-02-09 | 2012-08-02 | トランスフォーム インコーポレーテッド | Iii族窒化物デバイスおよび回路 |
JP2011114267A (ja) * | 2009-11-30 | 2011-06-09 | Sanken Electric Co Ltd | 半導体装置 |
JP2011138973A (ja) * | 2009-12-29 | 2011-07-14 | New Japan Radio Co Ltd | 窒化物半導体装置 |
JP2011142182A (ja) * | 2010-01-06 | 2011-07-21 | Sharp Corp | 電界効果トランジスタ |
JP2013069810A (ja) * | 2011-09-21 | 2013-04-18 | Fujitsu Ltd | 化合物半導体装置及びその製造方法 |
JP2012069978A (ja) * | 2011-11-14 | 2012-04-05 | Fujitsu Ltd | 化合物半導体装置 |
WO2013084726A1 (ja) * | 2011-12-07 | 2013-06-13 | シャープ株式会社 | 電界効果トランジスタ |
US10410868B2 (en) | 2013-06-03 | 2019-09-10 | Renesas Electronics Corporation | Semiconductor device and method of manufacturing semiconductor device |
US9276072B2 (en) | 2013-11-13 | 2016-03-01 | Fujitsu Limited | Semiconductor device and method for manufacturing semiconductor device |
JP2017195400A (ja) * | 2017-06-20 | 2017-10-26 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
Also Published As
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JPWO2005081304A1 (ja) | 2007-10-25 |
US20070164326A1 (en) | 2007-07-19 |
JP4888115B2 (ja) | 2012-02-29 |
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