WO2020183937A1 - 半導体素子、半導体装置、半導体素子の製造方法及び半導体装置の製造方法 - Google Patents
半導体素子、半導体装置、半導体素子の製造方法及び半導体装置の製造方法 Download PDFInfo
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- WO2020183937A1 WO2020183937A1 PCT/JP2020/002508 JP2020002508W WO2020183937A1 WO 2020183937 A1 WO2020183937 A1 WO 2020183937A1 JP 2020002508 W JP2020002508 W JP 2020002508W WO 2020183937 A1 WO2020183937 A1 WO 2020183937A1
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- insulating film
- channel region
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- 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
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
- H01L29/7851—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET with the body tied to the substrate
Definitions
- the technology according to the present disclosure (the present technology) relates to a semiconductor element, a semiconductor device, a method for manufacturing a semiconductor element, and a method for manufacturing a semiconductor device.
- a MOSFET fin-type FET
- a gate electrode having a convex portion embedded in the upper part of a semiconductor layer surrounds three main surfaces of a plate-shaped channel region.
- Patent Documents 1 and 2 are required to have further performance improvements such as improvement in transconductance gm.
- Patent Documents 1 and 2 do not disclose any relationship between the depth of the convex portion of the gate electrode of the MOSFET and the depth of the source region and the drain region.
- the present technology provides semiconductor devices, semiconductor devices, semiconductor device manufacturing methods, and semiconductor device manufacturing methods that can further improve the performance of insulated gate-type semiconductor devices that have gate electrodes that surround three surfaces of a plate-shaped channel region.
- the purpose is to provide.
- the semiconductor element includes a semiconductor layer, a channel region provided above the semiconductor layer, and first and second main electrodes provided opposite to both ends of the channel region in the channel length direction.
- the inner walls of the first and second trenches provided on both sides of the region and the side surfaces of the channel region facing each other in the channel width direction, and the gate insulating film provided on the upper surface of the channel region, and the gate insulating film are interposed.
- the gate insulating film is connected to the upper ends of the first convex portion, the first convex portion and the second convex portion embedded in the second trench via the first convex portion embedded in one trench and the gate insulating film, and is connected to the upper surface of the channel region. It is provided with a gate electrode having a horizontal portion provided via the above, and the depth of the first and second main electrode regions is the same as the depth including the gate insulating film of the first and second convex portions. It is a summary.
- the semiconductor device includes a semiconductor layer, a channel region provided above the semiconductor layer, and first and second main electrodes provided opposite to both ends of the channel region in the channel length direction.
- the inner walls of the first and second trenches provided on both sides of the region and the side surfaces facing each other in the channel width direction of the channel region, and the gate insulating film provided on the upper surface of the channel region, and the gate insulating film via the gate insulating film.
- a gate insulating film is connected to the upper ends of the first convex portion, the first convex portion and the second convex portion embedded in the second trench via the first convex portion embedded in one trench and the gate insulating film, and is connected to the upper surface of the channel region.
- the first semiconductor element having a gate electrode having a horizontal portion provided via the semiconductor layer and in the third and fourth main electrode regions, the third and fourth main electrode regions provided facing the upper part of the semiconductor layer.
- a second semiconductor element having a second gate electrode provided on a sandwiched semiconductor layer via a second gate insulating film is provided, and the depths of the first and second main electrode regions are the first and first.
- the gist is that the depth is the same as the depth including the gate insulating film of the two convex parts.
- a method for manufacturing a semiconductor device includes a step of digging a recess in the upper part of the semiconductor layer to form a channel region partitioned by the recess, a step of embedding an element separation insulating film in the recess, and a step of embedding an element separation insulating film in the recess.
- the material layer is embedded and connected to the first convex portion embedded in the first trench, the second convex portion embedded in the second trench, and the upper ends of the first and second convex portions, and the gate insulating film is formed on the upper surface of the channel region.
- the first and second convex portions are formed in the step of forming a gate electrode having a horizontal portion provided via the above, and the first and second main electrode regions facing each other across both ends in the channel length direction of the channel region.
- the gist is to include a step of forming at the same depth as the depth including the gate insulating film of the above.
- the method for manufacturing a semiconductor device includes a step of digging a recess in the upper part of the semiconductor layer to form a channel region partitioned by the recess, a step of embedding an element separation insulating film in the recess, and an element separation insulation.
- the process of forming the insulating film and the first convex portion embedded in the first trench and the second convex portion embedded in the second trench by embedding the conductive material layer in the first and second trenches via the gate insulating film.
- the step of forming the second gate electrode and the third and fourth main electrode regions facing each other with the semiconductor layer below the second gate electrode interposed therebetween have a depth different from that of the first and second main electrode regions.
- the gist is to include the process of forming in.
- FIG. 1 is a schematic configuration diagram of a semiconductor device (solid-state image sensor) according to the first embodiment.
- FIG. 2 is an equivalent circuit of a pixel region of the semiconductor device according to the first embodiment.
- FIG. 3 is a cross-sectional view of a main part of the semiconductor device according to the first embodiment.
- FIG. 4 is a plan view of a main part of the semiconductor device according to the first embodiment.
- FIG. 5 is a cross-sectional view taken from the direction BB'of FIG.
- FIG. 6 is a cross-sectional view taken from the direction CC'of FIG.
- FIG. 7A is a process sectional view showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 1 is a schematic configuration diagram of a semiconductor device (solid-state image sensor) according to the first embodiment.
- FIG. 2 is an equivalent circuit of a pixel region of the semiconductor device according to the first embodiment.
- FIG. 3 is a cross-sectional view of a main part of the semiconductor
- FIG. 7B is a process sectional view showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 8A is a process sectional view following FIG. 7A showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 8B is a process sectional view following FIG. 7B showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 9A is a process sectional view following FIG. 8A showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 9B is a process sectional view following FIG. 8B showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 10A is a process sectional view following FIG. 9A showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 10B is a process sectional view following FIG. 9B showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 11 is a process sectional view following FIG. 10 showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 12 is a process sectional view following FIG. 11 showing a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 13 is a process sectional view following FIG. 12, which shows a method of manufacturing the semiconductor device according to the first embodiment.
- FIG. 14 is a cross-sectional view of a main part of the semiconductor device according to the modified example of the first embodiment.
- FIG. 15 is a cross-sectional view of a main part of the semiconductor device according to the second embodiment.
- FIG. 16 is a cross-sectional view of a main part of the semiconductor device according to the comparative example of the second embodiment.
- FIG. 17 is a process sectional view showing a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 18 is a process sectional view following FIG. 17, which shows a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 19 is a process sectional view following FIG. 18 showing a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 20 is a process sectional view following FIG. 19 showing a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 21 is a process sectional view following FIG. 20, which shows a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 22 is a process sectional view following FIG.
- FIG. 21 showing a method of manufacturing the semiconductor device according to the second embodiment.
- FIG. 23 is a process sectional view showing a method of manufacturing a semiconductor device according to a modified example of the second embodiment.
- FIG. 24 is a process sectional view following FIG. 23 showing a method of manufacturing a semiconductor device according to a modified example of the second embodiment.
- FIG. 25 is a process sectional view following FIG. 24 showing a method of manufacturing a semiconductor device according to a modified example of the second embodiment.
- FIG. 26 is a schematic view showing an electronic device to which the semiconductor device according to another embodiment is applied.
- the "first main electrode region" of the semiconductor element constituting the semiconductor device including the solid-state imaging device is an insulated gate type field effect transistor (MISFET), an insulated gate type electrostatic induction transistor (MISSIT), or a high-voltage transistor. It means a semiconductor region that is either a source region or a drain region such as an electron mobility transistor (HEMT).
- the “second main electrode region” means a semiconductor region such as a MISFET that is either a source region or a drain region that does not become the first main electrode region. As described above, when the "first main electrode region” is the source region, the “second main electrode region” means the drain region. Further, the "third main electrode region” and the "fourth main electrode region” of the semiconductor element constituting the semiconductor device including the solid-state imaging device are the same as the "first main electrode region” and the "second main electrode region”. Have a relationship.
- the first conductive type is the n type and the second conductive type is the p type
- the conductive type may be selected in the opposite relationship
- the first conductive type may be the p type
- the second conductive type may be the n type.
- "+" and "-" attached to "n" and "p" are semiconductors having a relatively high or low impurity concentration as compared with the semiconductor regions to which "+” and "-” are not added. It means that it is an area.
- the impurity concentrations in the respective semiconductor regions are exactly the same.
- the definition of the vertical direction in the following description is merely a definition for convenience of explanation, and does not limit the technical idea of the present technology. For example, if the object is rotated 90 ° and observed, the top and bottom are converted to left and right and read, and if the object is rotated 180 ° and observed, the top and bottom are reversed and read.
- the semiconductor device As a type of semiconductor device (semiconductor integrated circuit) according to the first embodiment, a solid-state image sensor such as a CMOS image sensor will be exemplified.
- the semiconductor device includes a pixel region 1 and peripheral circuits (3, 4, 5, 6, 7).
- the pixel region 1 has a plurality of pixels 2 arranged in a two-dimensional matrix.
- each of the plurality of pixels 2 has a photoelectric conversion unit that photoelectrically converts incident light and a plurality of pixel transistors that control the photoelectrically converted signal charge.
- the plurality of pixel transistors for example, four transistors such as a transfer transistor, a reset transistor, a selection transistor, and an amplification transistor can be adopted.
- Peripheral circuits (3,4,5,6,7) include a vertical drive circuit 3, a column signal processing circuit 4, a horizontal drive circuit 5, an output circuit 6, and a control circuit 7.
- the vertical drive circuit 3 is composed of, for example, a shift register.
- the vertical drive circuit 3 sequentially selects the pixel drive wiring 8a, supplies a pulse for driving the pixel 2 to the selected pixel drive wiring 8a, and drives each pixel 2 in rows. That is, the vertical drive circuit 3 selectively scans each pixel 2 in the pixel region 1 in a row-by-row manner in the vertical direction, and outputs a signal (pixel signal) from the pixel based on the signal charge generated by the photoelectric conversion unit of each pixel 2. Is supplied to the column signal processing circuit 4 through the vertical signal line 8b.
- the column signal processing circuit 4 is arranged for each column of pixel 2, for example, and performs signal processing such as noise removal for each pixel string of signals output from pixel 2 for one row.
- the column signal processing circuit 4 performs signal processing such as correlated double sampling (CDS) and analog-to-digital (AD) conversion for removing fixed pattern noise peculiar to pixels.
- CDS correlated double sampling
- AD analog-to-digital
- the horizontal drive circuit 5 is composed of, for example, a shift register.
- the horizontal drive circuit 5 sequentially outputs horizontal scanning pulses to the column signal processing circuit 4, selects the column signal processing circuit 4 in order, and outputs the signal-processed pixel signal to the selected column signal processing circuit 4. Output to the horizontal signal line 9.
- the output circuit 6 performs signal processing on the pixel signals sequentially supplied from each of the column signal processing circuits 4 through the horizontal signal line 9 and outputs the signals.
- the control circuit 7 Based on the vertical synchronization signal, the horizontal synchronization signal, and the master clock signal, the control circuit 7 outputs a clock signal or a control signal that serves as a reference for the operation of the vertical drive circuit 3, the column signal processing circuit 4, the horizontal drive circuit 5, and the like. Generate. Then, the control circuit 7 outputs the generated clock signal and control signal to the vertical drive circuit 3, the column signal processing circuit 4, the horizontal drive circuit 5, and the like.
- the semiconductor device according to the first embodiment may have the configuration shown in FIG. 1 having a single substrate, or may have a laminated structure in which a plurality of substrates are bonded together.
- the semiconductor device according to the first embodiment is composed of the first and second substrates, a photoelectric conversion unit and a pixel transistor are provided on the first substrate, and peripheral circuits (3, 4, 5, 6,) are provided on the second substrate. 7) and the like may be provided.
- the first substrate may be provided with a photoelectric conversion unit and a part of the pixel transistors
- the second substrate may be provided with a part of the remainder of the pixel transistors and peripheral circuits (3, 4, 5, 6, 7) and the like. ..
- FIG. 2 shows an example of an equivalent circuit of pixel 2 of the semiconductor device according to the first embodiment.
- the anode of the photodiode PD which is the photoelectric conversion part of the pixel 2
- the source of the transfer transistor T1 which is an active element is connected to the cathode of the photodiode PD.
- a floating charge storage region (floating diffusion region) FD is connected to the drain of the transfer transistor T1.
- the charge storage region FD is connected to the source of the reset transistor T2, which is an active element, and the gate of the amplification transistor T3, which is an active element.
- the source of the amplification transistor T3 is connected to the drain of the selection transistor T4 which is an active element, and the drain of the amplification transistor T3 is connected to the power supply Vdd.
- the source of the selection transistor T4 is connected to the vertical signal line VSL.
- the drain of the reset transistor T2 is connected to the power supply Vdd.
- the signal charge generated by the photodiode PD of the pixel 2 is accumulated in the charge storage region FD of the pixel 2 via the transfer transistor T1 of the pixel 2.
- the signal charge accumulated in the charge storage region FD of the pixel 2 is read out and applied to the gate of the amplification transistor T3 of the pixel 2.
- a horizontal line selection control signal is given from the vertical shift register to the gate of the selection transistor T4 of the pixel 2.
- the selection transistor T4 becomes conductive, and the current corresponding to the potential of the charge storage region FD of the pixel 2 amplified by the amplification transistor T3 of the pixel 2 becomes the vertical signal line VSL.
- the semiconductor device includes a first semiconductor element 101 and a second semiconductor element 102 provided on the same semiconductor layer (semiconductor substrate) 10.
- the first semiconductor element 101 is, for example, an active element corresponding to the amplification transistor T3 shown in FIG. 2, and is defined inside the active region (first active region) of the semiconductor layer 10.
- the second semiconductor element 102 is, for example, an active element corresponding to a low-voltage analog transistor included in the peripheral circuits (3, 4, 5, 6, 7) shown in FIG. 1, and is an active region (third region) of the semiconductor layer 10. 2) Defined inside the active region).
- FIG. 4 is a plan view of the first semiconductor element 101 shown on the left side of FIG. 3, and the cross-sectional view seen from the direction AA'of FIG. 4 corresponds to FIG.
- FIG. 5 is a cross-sectional view taken from the direction BB'of FIG.
- FIG. 6 is a cross-sectional view taken from the direction CC'of FIG.
- FIGS. 3 to 6 omit the illustration of the interlayer insulating film, the gate surface wiring, the source electrode, the drain electrode, the protective film, etc. that cover the first semiconductor element 101 and the second semiconductor element 102.
- the first semiconductor element 101 is a first conductive type (n) provided on both ends of the channel region 10a in the direction of the channel length L, facing each other on the upper portion of the semiconductor layer 10. It has a first main electrode region (source region) 11 of the + type) and a second main electrode region (drain region) 12 of the first conductive type (n + type).
- the semiconductor layer 10 may be formed of a first conductive type (n ⁇ type) silicon (Si) substrate having a high resistivity and may be used in a depleted state. Further, the semiconductor layer 10 may be a well region on the upper part of the Si substrate or an epitaxial growth layer on the Si substrate. Alternatively, the semiconductor layer 10 may be composed of a semiconductor layer on the insulating layer constituting the SOI substrate. Further, the semiconductor layer 10 may be composed of a second conductive type (p ⁇ type) Si substrate.
- the impurity concentration of the first main electrode region 11 and the second main electrode region 12 is higher than the impurity concentration of the semiconductor layer 10.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 defined in FIG. 3 is, for example, about 200 nm to 500 nm, for example, about 300 nm.
- the first main electrode region 11 and the second main electrode region 12 are partitioned by an element separation insulating film 16 provided on the upper part of the semiconductor layer 10, and the elements are separated.
- the element separation insulating film 16 can be composed of an insulating film such as a silicon oxide film (SiO 2 film).
- first channel region 10a a part of the semiconductor layer 10 sandwiched between the first main electrode region 11 and the second main electrode region 12 constitutes a channel region (first channel region) 10a.
- the first channel region 10a is formed in a fin shape (plate shape), and extends in a direction in which the first main electrode region 11 and the second main electrode region 12 face each other (direction of channel length L1).
- first channel region 10a hidden directly under the gate electrode (first gate electrode) 14 is schematically shown by a broken line.
- the first semiconductor element 101 is provided so as to surround both sides and the upper surface of the side surfaces of the first channel region 10a facing each other with a gate insulating film (first gate insulating film) 13.
- the first gate electrode 14 is provided.
- the material of the first gate insulating film 13 includes a silicon oxide film (SiO 2 film), a silicon oxynitride film (SiON film), a strontium oxide film (SrO film), a silicon nitride film (Si 3 N 4 film), and aluminum oxide.
- Al 2 O 3 film magnesium oxide film (MgO film), yttrium oxide film (Y 2 O 3 film), hafnium oxide film (HfO 2 film), zirconium oxide film (ZrO 2 film), tantalum oxide film (Tantal oxide film)
- MgO film magnesium oxide film
- Y 2 O 3 film yttrium oxide film
- hafnium oxide film HfO 2 film
- zirconium oxide film zirconium oxide film
- tantalum oxide film tantalum oxide film
- a single-layer film of any one of Ta 2 O 5 film) and bismuth oxide film (Bi 2 O 3 film), or a composite film in which a plurality of these is laminated can be used.
- the first gate insulating film 13 is a SiO 2 film
- the thickness of the first gate insulating film 13 is, for example, about 5 nm to 20 nm if the Fowler-Nordheim (FN) tunnel current is operated at a low voltage that does not matter.
- the thickness of the SiO 2 film is 5 nm or less, it is necessary to consider leakage due to the direct tunnel current, but by selecting a material with a large relative permittivity of the first gate insulating film 13, it can be applied to the SiO 2 film. It is also possible to set the converted film thickness to 1 nm or less.
- the material of the first gate electrode 14 for example, polysilicon (doped polysilicon) in which a high concentration n-type impurity is introduced can be used.
- the material of the first gate electrode 14 is a refractory metal such as tungsten (W), molybdenum (Mo), titanium (Ti), or a refractory metal and polysilicon. It may be a conductive material such as Polyside, which is a composite film of polysilicon and polysilicon and a melting point metal.
- the first gate electrode 14 is embedded in the upper part of the semiconductor layer 10 via the first gate insulating film 13, and has a first convex portion 142 and a second convex portion 143 parallel to each other.
- a horizontal portion 141 is provided on the semiconductor layer 10 via a first gate insulating film 13 and connects the upper surfaces of the first convex portion 142 and the second convex portion 143 to each other.
- the first gate electrode 14 has a first convex portion 142, a second convex portion 143, and a horizontal portion 141 having a shape similar to that of a C-shaped rail (hereinafter, referred to as “C-shaped rail shape”).
- the first semiconductor element 101 constitutes a MOSFET (fin-type FET) having a plate-shaped (fin-type) first channel region 10a whose upper surface and side surfaces are surrounded by a C-shaped rail-shaped first gate electrode 14. ing. Then, the C-shaped rail-shaped first gate electrode 14 realizes a structure surrounding the three surfaces of the plate-shaped (thin rectangular parallelepiped-shaped) first channel region 10a.
- MOSFET fin-type FET
- the C-shaped rail-shaped cross-sectional shape of the first gate electrode 14 can be compared to the ⁇ -shaped Greek letter.
- the first convex portion 142 and the second convex portion 143 form the first gate insulating film 13 in a direction orthogonal to the opposite directions of the first main electrode region 11 and the second main electrode region 12 (direction of the channel width W1). Both sides of the side surface of the first channel region 10a are sandwiched therethrough.
- the first convex portion 142 and the second convex portion 143 extend between the first main electrode region 11 and the second main electrode region 12 in parallel with the direction of the channel length L1 of the first channel region 10a.
- a side wall insulating film 15 made of a silicon nitride film (Si 3 N 4 film) or the like is provided on the side wall serving as the channel end of the horizontal portion 141 of the first gate electrode 14. There is.
- the first gate electrode 14 has two first convex portions 142 and a second convex portion 143, but the number of convex portions of the first gate electrode 14 is illustrated. Is not particularly limited, and is not limited to the C-shaped rail shape.
- the first gate electrode 14 may have three or more convex portions, and may be provided with a plurality of channel regions having two or more convex portions corresponding to the number of convex portions.
- the first gate electrode 14 electrostatically controls the surface potential of the first channel region 10a facing the first convex portion 142, the second convex portion 143, and the horizontal portion 141 via the first gate insulating film 13. As a result, channels are formed on both sides and the upper surface side of the first channel region 10a.
- the depth D0 of the first convex portion 142 and the second convex portion 143 including the thickness of the first gate insulating film 13 from the upper surface of the channel region 10a defined in FIGS. 5 and 6 is, for example, from 200 nm. It is about 400 nm, for example, about 300 nm.
- the height H1 on the channel region 10a of the horizontal portion 141 including the thickness of the first gate insulating film 13 as defined in FIGS. 3 and 5 is, for example, about 200 nm to 400 nm, for example, about 300 nm.
- the depth D0 of the first convex portion 142 and the second convex portion 143 and the height H1 of the horizontal portion 141 may be substantially the same as each other or may be different from each other.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 defined in FIG. 3 is the first gate insulating film 13 defined in FIGS. 5 and 6.
- the depth D0 or more of the first convex portion 142 and the second convex portion 143 including the thickness of the first convex portion 142 is set.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 is 0 nm more than the depth D0 including the thickness of the first gate insulating film 13 of the first convex portion 142 and the second convex portion 143, for example. It may be as deep as about 200 nm, and may be as deep as 0 nm to 100 nm.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 is set to the first convex in order to suppress the manifestation of the short channel effect. It is preferable to set the depth D0 including the thickness of the first gate insulating film 13 of the portion 142 and the second convex portion 143 to be substantially the same.
- the depth 3 is defined by the dimensions not including the thickness of the first gate insulating film 13 and the first convex portion 142 and The depth may be set to be substantially the same as the depth of only the second convex portion 143. Further, the depth D1 of the first main electrode region 11 and the second main electrode region 12 is the same as the depth D0 of the first convex portion 142 and the second convex portion 143 including the thickness of the first gate insulating film 13. In that case, it is not always necessary that the values are completely the same, and the values may be substantially the same or the same as long as the characteristics of the semiconductor device according to the first embodiment are not hindered. In addition, there may be a difference in the value of the manufacturing error.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 May be made deeper than the depth D0 including the thickness of the first gate insulating film 13 of the first convex portion 142 and the second convex portion 143 to increase the transconductance gm.
- the height H1 of the horizontal portion 141 of the first gate electrode 14 is set to the depth D1 or more of the first main electrode region 11 and the second main electrode region 12. ..
- the height H1 of the horizontal portion 141 of the first gate electrode 14 is substantially the same as the depth D1 of the first main electrode region 11 and the second main electrode region 12 (for example, 300 nm, respectively).
- the horizontal portion 141 is used as an ion implantation mask to self-align the impurities. Ion implantation.
- the injected impurity ions penetrate the horizontal portion 141 and the first It is possible to prevent the channel region 10a from being reached.
- the second semiconductor element 102 shown on the right side of FIG. 3 is composed of a general planar type n-channel MOSFET.
- the second semiconductor element 102 is provided in the well region 10b of the second conductive type (p type) provided on the upper part of the semiconductor layer 10.
- the semiconductor layer 10 is composed of a second conductive type (p ⁇ type) Si substrate
- the second semiconductor element 102 may be provided on the semiconductor layer 10.
- the second semiconductor element 102 is of the first conductive type (n + type) third main electrode region (source region) 21 and the first conductive type (n + type) provided so as to face the upper portion of the well region 10b. It has a fourth main electrode region (drain region) 22.
- the impurity concentration of the third main electrode region 21 and the fourth main electrode region 22 is higher than the impurity concentration of the semiconductor layer 10.
- the second semiconductor element 102 passes through the second gate insulating film 23 on the channel region (second channel region) on the upper surface side of the well region 10b sandwiched between the third main electrode region 21 and the fourth main electrode region 22.
- the second gate electrode 24 provided is further provided.
- the second gate electrode 24 forms an inverted channel in the second channel region by electrostatically controlling the surface potential of the second channel region via the second gate insulating film 23.
- a side wall insulating film 25 made of a silicon nitride film (Si 3 N 4 film) or the like is provided on the side wall serving as the channel end of the second gate electrode 24.
- the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 are independent steps different from the step of forming the first main electrode region 11 and the second main electrode region 12 of the first semiconductor element 101. It is made separately by.
- the depth D2 of the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 is different from the depth D1 of the first main electrode region 11 and the second main electrode region 12 of the first semiconductor element 101. Is set.
- the depth D2 of the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 is set to be shallower than the depth D1 of the first main electrode region 11 and the second main electrode region 12.
- the depth D2 of the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 is, for example, about 100 nm to 200 nm, and may be, for example, about 150 nm.
- the second semiconductor element 102 is a transistor of a peripheral circuit
- the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 are set to the first main electrode region 11 of the first semiconductor element 101.
- the first semiconductor element 101 can be formed by a process independent of the second main electrode region 12. It is possible to prevent the influence on the miniaturization of the element separation width, the gate length, etc. of the peripheral circuit.
- the second gate electrode 24 of the second semiconductor element 102 is made by an independent process different from the process of forming the first gate electrode 14 of the first semiconductor element 101.
- the height H2 of the second gate electrode 24 is set to be different from the height H1 of the horizontal portion 141 of the first gate electrode 14.
- the height H2 of the second gate electrode 24 is set lower than the height H1 of the horizontal portion 141 of the first gate electrode 14, and the film does not have to be thickened like the first gate electrode 14.
- the height H2 of the second gate electrode 24 is, for example, about 100 nm to 200 nm, for example, about 150 nm.
- the second gate electrode 24 of the second semiconductor element 102 is made separately by a process independent of the first gate electrode 14 of the first semiconductor element 101. As a result, even if the height H1 of the horizontal portion 141 of the first gate electrode 14 is increased, the gate length of the second gate electrode 24 of the second semiconductor element 102 is made finer without being affected by the first semiconductor element 101. can do.
- FIGS. 7A to 13 an example of the method for manufacturing a semiconductor device according to the first embodiment will be described focusing on the structure of the semiconductor element included in the semiconductor device.
- the first semiconductor element 101 shown on the left side of FIG. 3 will be mainly focused on and described.
- 7A, 8A, 9A, 10 to 13 are process cross-sectional views viewed from the direction of AA'in FIG. 3, and
- FIGS. 7B, 8B, and 9B are CC'in FIG. It is a process sectional view seen from.
- a food engraving protective film (first food engraving protective film) 41 such as an oxide film is deposited on the semiconductor layer 10. Then, the first food engraving protective film 41 is patterned so as to define the first and second active regions by dry etching such as photolithography technology and reactive ion etching (RIE). Using the patterned first food engraving protective film 41 as an etching mask, dry etching such as RIE leaves the first and second active regions on the upper part of the semiconductor layer 10 as shown in FIGS. 7A and 7B. The recess (recess for element separation) 30 is dug as described above. The upper portion of the semiconductor layer 10 partitioned by the recesses 30 and exposed as the first active region becomes the first channel region 10a. After that, the first meal engraving protective film 41 is removed.
- dry etching such as photolithography technology and reactive ion etching (RIE).
- an element separation insulating film 16 such as an oxide film inside the recess 30 of the semiconductor layer 10 according to the shallow trench isolation (STI) method.
- the device isolation insulating film 16 is formed so as to partition the first active region.
- a new corrosion protection film (second corrosion protection film) 42 such as an oxide film is deposited on the first channel region 10a and the element separation insulating film 16 by the CVD method or the like.
- the second food engraving protective film 42 is patterned by photolithography technology and dry etching.
- a part of the element separation insulating film 16 is selectively removed by dry etching such as RIE as shown in FIGS. 9A and 9B.
- the pair of first trench 31 and second trench 32 are dug parallel to each other so that both sides of the side surface of the first channel region 10a are exposed.
- the first channel region 10a is partitioned by the vertical side walls of the pair of the first trench 31 and the second trench 32, respectively.
- the pair of first trench 31 and second trench 32 penetrate the element separation insulating film 16 to expose the upper surface of the semiconductor layer 10 at the bottom of the element separation insulation film 16. After that, the second food engraving protective film 42 is removed.
- an oxide film is formed as the first gate insulating film 13 on the inner walls of the pair of the first trench 31 and the second trench 32 and the upper surface of the first channel region 10a by a thermal oxidation method (dry oxidation method) or the like.
- the second gate insulating film 23 of the second semiconductor element 102 shown in FIG. 3 is also formed in the second active region with the same film thickness.
- the first gate insulating film 13 is formed on the first channel region 10a and the element separation insulating film 16 so as to embed the inside of the pair of the first trench 31 and the second trench 32.
- a conductive material layer such as a DOPOS layer is deposited therethrough. Then, a part of the first gate insulating film 13 and the conductive material layer is selectively removed by photolithography technology and dry etching. As a result, as shown in FIGS. 10A and 10B, the first convex portion 142 and the second convex portion 142 and the second made of the conductive material layer embedded in the first trench 31 and the second trench 32 via the first gate insulating film 13.
- a C-shaped rail-shaped first gate electrode 14 is formed in the first active region by the convex portion 143 and the horizontal portion 141 formed of the conductive material layer provided on the semiconductor layer 10 via the first gate insulating film 13. To do.
- the step of forming the second gate electrode 24 of the second semiconductor element 102 shown in FIG. 3 is performed on the second active region.
- a conductive material layer is deposited on the semiconductor layer 10 which is a planned region for forming the second semiconductor element 102 by a CVD method or the like.
- a part of the conductive material layer is selectively removed by photolithography technology and dry etching to form the second gate electrode 24 of the second semiconductor element 102 in the second active region shown in FIG. .
- the second gate insulating film 23 of the second semiconductor element 102 may be formed in a separate process from the first gate insulating film 13 of the first semiconductor element 101.
- an extended insulating film is deposited on the semiconductor layer 10 and the horizontal portion 141 shown in FIG. 10A by a CVD method or the like. Then, a part of the extended insulating film is selectively removed so that the extended insulating film remains at both ends of the horizontal portion 141 in the gate length direction by photolithography technology and dry etching. As shown in FIG. 11, a semi-kamaboko-shaped side wall insulating film 15 is formed on the side wall of the horizontal portion 141 in the gate length direction by selective etching of the extended insulating film.
- the photoresist film 43 is applied and the photoresist film 43 is patterned using a photolithography technique.
- impurities exhibiting the first conductive type (n type) such as arsenic ion ( 75 As + ) and phosphorus ion ( 31 P + ) with respect to the opening of the patterned photoresist film 43.
- n type first conductive type
- ion implantation regions 11x and 12x are formed on the upper part of the semiconductor layer 10.
- the injection of the n-type impurity ion is self-implanted by using the horizontal portion 141 exposed inside the opening of the patterned photoresist film 43 and the side wall insulating film 15 as an ion implantation mask.
- the injected impurity ions penetrate the horizontal portion 141 and reach the first channel region 10a. Can be prevented. After that, the photoresist film 43 is removed.
- a new photoresist film is applied to form a photolithography technique.
- the photoresist film is patterned using. Ion implantation is performed using the patterned photoresist film as an ion implantation mask.
- the accelerating voltage is adjusted so that the projection range of ion implantation for forming the first main electrode region 11 and the second main electrode region 12 is shallower than the projection range D3.
- the height H1 of the horizontal portion 141 is set.
- the projection range D3 or higher defined in FIG. 12 may be set.
- the projection range D3 is shallower than the depth D1 of the first main electrode region 11 and the second main electrode region 12.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 is equal to or greater than the depth D0 including the thickness of the first gate insulating film 13 of the first convex portion 142 and the second convex portion 143.
- the impurity ions in the ion-implanted region of the second semiconductor element 102 are simultaneously activated, and the impurity elements after activation are simultaneously thermally diffused, so that the third main electrode region 21 and the fourth main electrode are simultaneously activated. Region 22 is formed.
- a semiconductor device including the first semiconductor element 101 and the second semiconductor element 102 shown in FIG. 3 as a part of the circuit element can be obtained. Complete.
- the depth D1 of the first main electrode region 11 and the second main electrode region 12 of the first semiconductor element 101 is set to the first convex portion 142 and the second convex portion.
- the depth D0 or more including the thickness of the first gate insulating film 13 of 143 it becomes possible to realize the first semiconductor element 101 capable of increasing the transconductance gm.
- the first main unit of the first semiconductor element 101 Even when the depth D1 of the electrode region 11 and the second main electrode region 12 is deepened, it is possible to prevent the influence on the miniaturization of the second semiconductor element 102.
- an ion injection step for forming the first main electrode region 11 and the second main electrode region 12 of the first semiconductor element 101, and the third main electrode region 21 and the fourth main electrode region 22 of the second semiconductor element 102 Since the ion injection step for forming the above is performed individually, even when the depth D1 of the first main electrode region 11 and the second main electrode region 12 of the first semiconductor element 101 is deepened, the second semiconductor element 102 The influence on miniaturization can be prevented.
- the first semiconductor device 101 included in the semiconductor device according to the modified example of the first embodiment constitutes a low-concentration doped drain (LDD) structure, which is the first point shown in FIG. It is different from the first semiconductor element 101 of the semiconductor device according to the embodiment.
- a first extension region 11a which is a low-concentration overhang region (LDD region) is provided above the first main electrode region 11.
- the depth of the first extension region 11a is shallower than the depth of the first main electrode region 11, and the impurity concentration of the first extension region 11a is lower than the impurity concentration of the first main electrode region 11.
- a second extension region 12a which is a low-concentration overhang region, is provided above the second main electrode region 12.
- the depth of the second extension region 12a is shallower than the depth of the second main electrode region 12, and the impurity concentration of the second extension region 12a is lower than the impurity concentration of the second main electrode region 12.
- the first extension region 11a and the second extension region 12a face each other and protrude toward the channel side, and overlap with the region below the end portion of the horizontal portion 141. Since the semiconductor element 101 included in the semiconductor device according to the modification of the first embodiment has a gate overlap structure including a first extension region 11a and a second extension region 12a, it is more suitable for suppressing the short channel effect. It has a structure. Other configurations of the first semiconductor element 101 included in the semiconductor device according to the modified example of the first embodiment are the same as those of the first semiconductor element 101 of the semiconductor device according to the first embodiment shown in FIGS. 3 to 6. Since there are, duplicate explanations will be omitted.
- the semiconductor element 101 included in the semiconductor device according to the second embodiment has a first main electrode region 51 and a second main electrode facing the upper part of the semiconductor layer 10 via the first channel region 10a.
- a region 52 is provided.
- FIG. 15 corresponds to a cross-sectional view of the first semiconductor element 101 of the semiconductor device according to the first embodiment shown in FIG. 4 as viewed from the AA'direction.
- the depth D1 of the first main electrode region 51 and the second main electrode region 52 includes the thickness of the first gate insulating film 13 of the first convex portion 142 and the second convex portion 143.
- the point that the depth D0 (see FIGS. 5 and 6) or more is set is common to the first semiconductor element 101 according to the first embodiment.
- the point that the first main electrode region 51 and the second main electrode region 52 are made of DOPOS formed by vapor phase growth such as a selective CVD method is a point of the first embodiment. It is different from the first semiconductor element 101 according to the above.
- the first main electrode region 51 and the second main electrode region 52 may be epitaxially grown by vapor phase growth at a higher temperature, or the DOPOS may be heat-treated to be converted into a crystallinity close to that of the epitaxial growth layer. Good. Further, in order to make the first main electrode region 51 and the second main electrode region 52 into an epitaxial growth layer having high crystallinity, a method of epitaxial growth of a photoexcited molecular layer under an ultra-high vacuum may be used. Even if the optical surface catalytic effect of ultraviolet rays is utilized in the reduced pressure CVD, it is possible to make the first main electrode region 51 and the second main electrode region 52 crystallinity close to a single crystal.
- the first gate electrode 14 is embedded in the upper part of the semiconductor layer 10 via the first gate insulating film 13, and the first convex portion 142 and the first convex portion 142 parallel to each other. It has a two-convex portion 143 and a horizontal portion 141 provided on the semiconductor layer 10 via a first gate insulating film 13 and connecting the upper surfaces of the first convex portion 142 and the second convex portion 143 to each other (FIG. FIG. 5 and FIG. 6 etc.). An interlayer insulating film 17 is provided on the horizontal portion 141 of the first gate electrode 14.
- the height H1 of the horizontal portion 141 may be equal to or greater than the depth D1 of the first main electrode region 51 and the second main electrode region 52, and may be equal to or greater than the depth D1 of the first main electrode region 51 and the second main electrode region 52. It may be the same.
- the height H1 of the horizontal portion 141 of the first gate electrode 14 may be lower than the depth D1 of the first main electrode region 51 and the second main electrode region 52.
- the depth D1 of the first main electrode region 51 and the second main electrode region 52 of the first semiconductor element 101 is the same as that of the semiconductor device according to the first embodiment.
- the depth is set to D0 or more including the thickness of the first gate insulating film 13 of the 1-convex portion 142 and the 2nd convex portion 143. Therefore, the transconductance gm of the first semiconductor element 101 can be increased.
- the first main electrode region 51 and the second main electrode region 52 are formed by a gas phase growth method such as a selective CVD method. Therefore, even if the height H1 of the horizontal portion 141 of the first gate electrode 14 is not set to the depth D1 or more of the first main electrode region 51 and the second main electrode region 52, the semiconductor device according to the second embodiment is manufactured. In the process, it is possible to prevent the impurity ions injected to form the first main electrode region 51 and the second main electrode region 52 from penetrating the horizontal portion 141 and reaching the first channel region 10a.
- the doping gas is used so as to add the desired conductive type impurities during the vapor phase growth, the ion implantation step for forming the first main electrode region 51 and the second main electrode region 52 is performed. It is unnecessary. If the first main electrode region 51 and the second main electrode region 52 are n-type, phosphine (PH 3 ) or arsine (AsH 3 ) can be used as the doping gas.
- the semiconductor element included in the semiconductor device according to the comparative example includes a first main electrode region 51x and a second main electrode region 52x formed by ion injection and heat treatment after injection. It is different from the first semiconductor element 101 included in the semiconductor device according to the second embodiment shown in 15.
- crystal damage is introduced by ion implantation for forming the first main electrode region 51x and the second main electrode region 52x, and the subsequent heat treatment causes the first main electrode region 51x and the second main electrode region 51x and the second main electrode.
- EOR defects may result in insufficient activation of impurities, partially forming a high resistance layer and increasing contact resistance.
- the first semiconductor element 101 included in the semiconductor device according to the second embodiment has the first main electrode region 51 and the second main electrode region 52 as opposed to the semiconductor device according to the comparative example. Since it is formed by phase growth, it does not have an EOR defect under the first main electrode region 51 and the second main electrode region 52.
- the vapor phase growth method it is possible to suppress the increase in resistance due to EOR defects and to reduce the resistance and contact resistance in the semiconductor layer 10. The presence or absence of EOR defects can be confirmed by a transmission electron microscope (TEM).
- the first main electrode region 51 and the second main electrode region 52 are formed by vapor phase growth. Since the vapor phase growth method is used, the height H1 of the horizontal portion 141 of the first gate electrode 14 does not have to be equal to or greater than the depth D1 of the first main electrode region 51 and the second main electrode region 52. It is possible to prevent the impurity ions injected into the electrode region and the second main electrode region from penetrating the horizontal portion 141 and reaching the first channel region 10a.
- the method for manufacturing the semiconductor device according to the second embodiment is the same as the method for manufacturing the semiconductor device according to the first embodiment up to the procedure shown in FIGS. 10A and 10B.
- an interlayer insulating film 17 is formed on the upper surface of the horizontal portion 141 by a CVD method, dry etching, or the like, and side wall insulating films 15 are formed on both end surfaces of the horizontal portion 141 in the gate length direction. To do.
- an insulating film 44 for a hard mask made of an oxide film or the like is deposited by a CVD method or the like.
- the photoresist film 45 is applied onto the hard mask insulating film 44, and the photoresist film 45 is patterned using a photolithography technique.
- the patterned photoresist film 45 is used as an etching mask to pattern the hard mask insulating film 44, and as shown in FIG. 19, a hard mask made of the patterned hard mask insulating film 44 is formed. After that, the photoresist film 45 is removed.
- a part of the semiconductor layer 10 is removed by dry etching such as RIE in a self-aligned manner using the hard mask 44, the interlayer insulating film 17, and the side wall insulating film 15 as etching masks.
- dry etching such as RIE
- a rectangular third trench (first well type groove) 61 and a fourth trench (second well type groove) 62 are formed facing each other on the upper part of the semiconductor layer 10.
- the main electrode region 52 is formed.
- the hard mask 44 is removed.
- the silicon layer becomes an epitaxial growth layer (single crystal layer), a polysilicon layer (polycrystalline layer), and an amorphous layer (amorphous layer). Since there is also diffusion due to auto-doping during vapor phase growth, the doping region laterally diffuses below the side wall insulating film 15.
- the semiconductor device according to the second embodiment including the first semiconductor element 101 shown in FIG. 15 as a part of the circuit element can be obtained. Complete.
- the first main electrode region 51 and the second main electrode region 52 are vapor-deposited inside the third trench 61 and the fourth trench 62, respectively. ) Is formed. That is, when the first main electrode region and the second main electrode region are formed by ion implantation, the problem that the injected impurity ions penetrate the horizontal portion 141 and reach the first channel region 10a is solved.
- the method for manufacturing the semiconductor device according to the second embodiment can be eliminated.
- ⁇ Modified example of the second embodiment> As a method for manufacturing the semiconductor device according to the modified example of the second embodiment, only the gas phase growth (doping growth) of the first main electrode region 51 and the second main electrode region 52 using the doping gas is sufficient for the first main electrode. A method of increasing the impurity concentration in the first main electrode region 51 and the second main electrode region 52 when the impurity concentrations in the region 51 and the second main electrode region 52 are insufficient will be described.
- the method for manufacturing the semiconductor device according to the modified example of the second embodiment is the same up to the procedure shown in FIG. 20 of the method for manufacturing the semiconductor device according to the second embodiment.
- the bottom surface and side surfaces of the third trench 61 and the fourth trench 62 are doped with first conductive type (n type) impurities such as arsenic (As) and phosphorus (P) by plasma doping or solid phase diffusion.
- first conductive type (n + type) first doping regions 51a and 52a that are a part of the first main electrode region 51 and the second main electrode region 52 are formed.
- the first main electrode region 51 and the second main electrode region 52 are selectively vapor-deposited so as to embed the silicon layer in the third trench 61 and the fourth trench 62.
- the second doping regions 51b and 52b of the first conductive type (n + type) that are a part of the above are formed.
- the hard mask 44, the interlayer insulating film 17, and the side wall insulating film 15 are used as ion implantation masks, and arsenic ions ( 75 As) are applied to the upper surfaces of the second doping regions 51b and 52b.
- Implantation of impurity ions exhibiting the first conductive type (n type) such as + ) and phosphorus ions ( 31 P + ) is performed with a shallow projection range. After that, heat treatment is performed to activate impurity ions and thermally diffuse them, so that the first conductive type (n) becomes a part of the first main electrode region 51 and the second main electrode region 52 as shown in FIG. + Type) third doping regions 51c and 52c are formed.
- the first main electrode region (51a, 51b, 51c) including the first doping region 51a, the second doping region 51b and the third doping region 51c is formed, and the first doping region 52a and the second doping region are formed.
- Second main electrode regions (52a, 52b, 52c) composed of 52b and a third doping region 52c are formed.
- the first main electrode region (51a, 51b, 51c) and the second main electrode region (52a, The impurity concentration of 52b, 52c), particularly the impurity concentration of the first doping regions 51a and 52a, can be increased.
- the second doping regions 51b and 52b which are a part of the first main electrode region 51 and the second main electrode region 52
- shallow ion implantation is performed on the upper surfaces of the second doping regions 51b and 52b.
- the third doping regions 51c and 52c which are a part of the first main electrode region 51 and the second main electrode region 52 are formed.
- the impurity concentration of 52b, 52c), particularly the impurity concentration of the third doping region 51c, 52c can be increased.
- the steps of forming the first doping regions 51a and 52a shown in FIG. 22 and the third doping regions 51c shown in FIGS. 24 and 25, The case where any of the steps of forming the 52c is performed has been illustrated. However, only one of the steps of forming the first doping regions 51a and 52a shown in FIG. 22 and the steps of forming the third doping regions 51c and 52c shown in FIGS. 24 and 25 is performed, and the other is performed. It is not necessary to carry out the process of.
- the semiconductor devices according to the first and second embodiments are applied to all types of electronic devices having an imaging function, such as camera systems such as digital still cameras and video cameras, and mobile phones having an imaging function. be able to.
- it can be applied to the electronic device (camera) shown in FIG.
- the electronic device shown in FIG. 26 is, for example, a video camera capable of capturing a still image or a moving image, and includes a semiconductor device 200, an optical system (optical lens) 201, a shutter device 202, a semiconductor device 200, and a shutter device 202. It has a drive unit 204 for driving and a signal processing unit 203.
- the optical system 201 guides the image light (incident light) from the subject to the pixel region 1 of the semiconductor device 200.
- the optical system 201 may be composed of a plurality of optical lenses.
- the shutter device 202 controls the light irradiation period and the light shielding period of the semiconductor device 200.
- the drive unit 204 controls the transfer operation of the semiconductor device 200 and the shutter operation of the shutter device 202.
- the signal processing unit 203 performs various signal processing on the signal output from the semiconductor device 200.
- the video signal after signal processing is stored in a storage medium such as a memory, or is output to a monitor or the like.
- the first semiconductor element 101 is an amplification transistor
- the first semiconductor element 101 is a pixel transistor such as a transfer transistor other than the amplification transistor. May be good.
- the first semiconductor element 101 can also be used for analog transistors in peripheral circuits other than pixel transistors.
- the depth D1 of the first main electrode region 51 and the second main electrode region 52 is insulated from the first gate of the first convex portion 142 and the second convex portion 143.
- the s factor (s value) can be reduced by setting the depth D0 or more including the thickness of the film 13 to the depth D0 or more.
- the semiconductor layer 10 is a Si substrate is illustrated, but instead of the Si substrate, silicon carbide (SiC), gallium nitride (GaN), gallium arsenide (A semiconductor (wide bandgap semiconductor) substrate having a forbidden bandwidth wider than that of Si such as GaAs) may be used.
- SiC silicon carbide
- GaN gallium nitride
- a semiconductor (wide bandgap semiconductor) substrate having a forbidden bandwidth wider than that of Si such as GaAs) may be used.
- the present technology can have the following configurations.
- (1) With the semiconductor layer A channel region provided above the semiconductor layer and The first and second main electrode regions provided opposite to both ends in the channel length direction of the channel region, and The inner walls of the first and second trenches provided on both sides of the side surfaces facing each other in the channel width direction of the channel region, and the gate insulating film provided on the upper surface of the channel region.
- a gate electrode having a horizontal portion connected to the above channel region and provided on the upper surface of the channel region via the gate insulating film.
- the inner walls of the first and second trenches provided on both sides of the side surfaces facing each other in the direction, and the gate insulating film provided on the upper surface of the channel region are embedded in the first trench via the gate insulating film.
- the gate insulating film is connected to the upper ends of the first convex portion, the second convex portion embedded in the second trench, the first and second convex portions via the gate insulating film, and the upper surface of the channel region.
- a first semiconductor element having a gate electrode having a horizontal portion provided via A second gate insulating film is provided on the semiconductor layer sandwiched between the third and fourth main electrode regions and the third and fourth main electrode regions provided so as to face the upper portion of the semiconductor layer.
- the first semiconductor element is an amplification transistor included in the pixels of the solid-state image sensor.
- the second semiconductor element is a transistor included in a peripheral circuit of the solid-state image sensor.
- the first and second main electrode regions facing each other across both ends of the channel region in the channel length direction are formed at the same depth as the depth including the gate insulating film of the first and second convex portions.
- the step of forming the first and second main electrode regions is The procedure for injecting impurity ions into the upper surface of the semiconductor layer and The procedure for activating the impurity ions by heat treatment and Including The method for manufacturing a semiconductor device according to (8), wherein the thickness of the horizontal portion is made thicker than the projection range of the impurity ions.
- the step of forming the first and second main electrode regions is A procedure for digging third and fourth trenches facing each other on both ends of the channel region in the channel length direction, and The procedure for forming the first and second main electrode regions by embedding the conductive material layer in the third and fourth trenches by vapor phase deposition, and The method for manufacturing a semiconductor device according to (8).
- the first and second main electrode regions facing each other across both ends of the channel region in the channel length direction are formed at the same depth as the depth including the gate insulating film of the first and second convex portions.
- the process to do to do A step of forming a second gate electrode on the semiconductor layer via the gate insulating film, and A step of forming the third and fourth main electrode regions facing each other across the semiconductor layer below the second gate electrode at a depth different from that of the first and second main electrode regions.
- a method for manufacturing a semiconductor device including.
- Gate electrode, 30 ... Recessed, 31, 32 ... Trench, 41, 42 ... Eating protective film, 43, 45 ... Photoresist film, 44 ... Hard mask, 51, 51x, 52, 52x ... Main electrode region, 51a, 51b, 51c, 52a, 52b, 52c ... Doping Region, 61, 62 ... Trench, 101, 102 ... Semiconductor element, 141 ... Horizontal part, 142, 143 ... Convex part, 200 ... Semiconductor device, 201 ... Optical system, 202 ... Shutter device, 203 ... Signal processing unit, 204 ... Drive part
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Abstract
Description
<半導体装置>
第1実施形態に係る半導体装置(半導体集積回路)の一類型として、CMOSイメージセンサ等の固体撮像装置を例示する。第1実施形態に係る半導体装置は、図1に示すように、画素領域1及び周辺回路(3,4,5,6,7)を備える。画素領域1は、2次元マトリクス状に配列された複数の画素2を有する。図1では図示を省略するが、複数の画素2のそれぞれは、入射光を光電変換する光電変換部と、光電変換された信号電荷を制御する複数の画素トランジスタとを有する。複数の画素トランジスタは、例えば、転送トランジスタ、リセットトランジスタ、選択トランジスタ及び増幅トランジスタの4つのトランジスタを採用できる。
次に、図7A~図13を参照して、第1実施形態に係る半導体装置の製造方法の一例を、半導体装置に含まれる半導体素子の構造に着目して説明する。ここでは、図3の左側に示した第1半導体素子101に主に着目して説明する。図7A、図8A、図9A、図10~図13は、図3のA-A´方向から見た工程断面図であり、図7B、図8B、図9Bは、図3のC-C´から見た工程断面図である。
第1実施形態の変形例に係る半導体装置に含まれる第1半導体素子101は、図14に示すように、低濃度ドープド・ドレイン(LDD)構造を構成する点が、図3に示した第1実施形態に係る半導体装置の第1半導体素子101と異なる。図14に示すように、第1主電極領域11の上部には、低濃度張り出し領域(LDD領域)となる第1エクステンション領域11aが設けられている。第1エクステンション領域11aの深さは、第1主電極領域11の深さよりも浅く、第1エクステンション領域11aの不純物濃度は、第1主電極領域11の不純物濃度よりも低い。第2主電極領域12の上部には、低濃度張り出し領域となる第2エクステンション領域12aが設けられている。第2エクステンション領域12aの深さは、第2主電極領域12の深さよりも浅く、第2エクステンション領域12aの不純物濃度は、第2主電極領域12の不純物濃度よりも低い。
<半導体装置>
第2実施形態に係る半導体装置に含まれる半導体素子101は、図15に示すように、半導体層10の上部に第1チャネル領域10aを介して対向した第1主電極領域51及び第2主電極領域52を備える。図15は、図4に示した第1実施形態に係る半導体装置の第1半導体素子101のA-A´方向から見た断面図に対応する。
ここで、比較例に係る半導体装置を説明する。比較例に係る半導体装置に含まれる半導体素子は、図16に示すように、イオン注入及び注入後の熱処理により形成された第1主電極領域51x及び第2主電極領域52xを備える点が、図15に示した第2実施形態に係る半導体装置に含まれる第1半導体素子101と異なる。比較例に係る半導体装置では、第1主電極領域51x及び第2主電極領域52xを形成するためのイオン注入により結晶ダメージが導入され、その後の熱処理により、第1主電極領域51x及び第2主電極領域52xの下方に位置する半導体層10に不純物が偏析し、転位ループ等のエンド・オブ・レンジ(EOR)欠陥が発生する。EOR欠陥により、不純物の活性化が不十分となり、部分的に高抵抗化層を形成し、コンタクト抵抗を増大させる場合がある。
次に、図17~図21等を参照して、第2実施形態に係る半導体装置の製造方法の一例を、図15に示した半導体装置に含まれる第1半導体素子101の構造に着目して説明する。
第2実施形態の変形例に係る半導体装置の製造方法として、第1主電極領域51及び第2主電極領域52をドーピングガスを用いて気相成長(ドーピング成長)するのみでは、第1主電極領域51及び第2主電極領域52の不純物濃度が不足する場合に、第1主電極領域51及び第2主電極領域52の不純物濃度を高める方法を説明する。
上記のように、本技術は第1及び第2実施形態及び各変形例によって記載したが、この開示の一部をなす論述及び図面は本技術を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
(1)
半導体層と、
前記半導体層の上部に設けられたチャネル領域と、
前記チャネル領域のチャネル長方向の両端側に対向して設けられた第1及び第2主電極領域と、
前記チャネル領域のチャネル幅方向の互いに対向する側面の両側に設けられた第1及び第2トレンチの内壁、並びに前記チャネル領域の上面に設けられたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1トレンチに埋め込まれた第1凸部、前記ゲート絶縁膜を介して前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極と、
を備え、
前記第1及び第2主電極領域の深さが、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一である、半導体素子。
(2)
前記水平部の高さが、前記第1及び第2主電極領域の深さ以上である、(1)に記載の半導体素子。
(3)
前記第1及び第2主電極領域の直下に位置する前記半導体層にエンド・オブ・レンジ欠陥を有さない、(1)又は(2)に記載の半導体素子。
(4)
半導体層と、前記半導体層の上部に設けられたチャネル領域と、前記チャネル領域のチャネル長方向の両端側に対向して設けられた第1及び第2主電極領域と、前記チャネル領域のチャネル幅方向の互いに対向する側面の両側に設けられた第1及び第2トレンチの内壁、並びに前記チャネル領域の上面に設けられたゲート絶縁膜と、前記ゲート絶縁膜を介して前記第1トレンチに埋め込まれた第1凸部、前記ゲート絶縁膜を介して前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極とを有する第1半導体素子と、
前記半導体層の上部に対向して設けられた第3及び第4主電極領域、前記第3及び第4主電極領域に挟まれた前記半導体層上に第2ゲート絶縁膜を介して設けられた第2ゲート電極とを有する第2半導体素子と、
を備え、
前記第1及び第2主電極領域の深さが、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一である、半導体装置。
(5)
前記第3及び第4主電極領域の深さが、前記第1及び第2主電極領域の深さよりも浅い、(4)に記載の半導体装置。
(6)
前記第2ゲート電極の高さが、前記水平部の高さよりも低い、(4)又は(5)に記載の半導体装置。
(7)
前記第1半導体素子が、固体撮像装置の画素に含まれる増幅トランジスタであり、
前記第2半導体素子が、前記固体撮像装置の周辺回路に含まれるトランジスタである、
(4)~(6)のいずれかに記載の半導体装置。
(8)
半導体層の上部に凹部を掘り、前記凹部で区画されたチャネル領域を形成する工程と、
前記凹部に素子分離絶縁膜を埋め込む工程と、
前記素子分離絶縁膜を選択的に除去して、前記チャネル領域のチャネル幅方向の互いに対向する側面を露出する第1及び第2トレンチを掘る工程と、
前記第1及び第2トレンチの内壁、並びに前記チャネル領域の上面にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜を介して前記第1及び第2トレンチに導電性材料層を埋め込み、前記第1トレンチに埋め込まれた第1凸部、前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極を形成する工程と、
前記チャネル領域のチャネル長方向の両端側を挟んで互いに対向する第1及び第2主電極領域を、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一の深さで形成する工程と、
を含む、半導体素子の製造方法。
(9)
前記第1及び第2主電極領域を形成する工程は、
前記半導体層の上面に不純物イオンを注入する手順と、
前記不純物イオンを熱処理により活性化させる手順と、
を含み、
前記不純物イオンの射影飛程よりも、前記水平部の厚さを厚くする、(8)に記載の半導体素子の製造方法。
(10)
前記第1及び第2主電極領域を形成する工程は、
前記チャネル領域のチャネル長方向の両端側に、互いに対向して第3及び第4トレンチを掘る手順と、
前記第3及び第4トレンチ内に導電性材料層を気相成長で埋め込むことにより、前記第1及び第2主電極領域を形成する手順と、
を含む、(8)に記載の半導体素子の製造方法。
(11)
前記気相成長で埋め込む手順の前に、前記第3及び第4トレンチの底面及び側面に、前記第1及び第2主電極領域と同一導電型を呈する不純物を熱拡散で添加する手順を更に含む、(10)に記載の半導体素子の製造方法。
(12)
前記気相成長で埋め込む手順の後に、
前記第1及び第2主電極領域と同一導電型を呈する不純物イオンを、前記第1及び第2主電極領域の上面に注入する手順と、
前記不純物イオンを熱処理により活性化させる手順と、
を更に含む、(10)又は(11)に記載の半導体素子の製造方法。
(13)
半導体層の上部に凹部を掘り、前記凹部で区画されたチャネル領域を形成する工程と、
前記凹部に素子分離絶縁膜を埋め込む工程と、 前記素子分離絶縁膜を選択的に除去して、前記チャネル領域のチャネル幅方向の互いに対向する側面を露出する第1及び第2トレンチを掘る工程と、
前記第1及び第2トレンチの内壁、並びに前記チャネル領域の上面にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜を介して前記第1及び第2トレンチに導電性材料層を埋め込み、前記第1トレンチに埋め込まれた第1凸部、前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極を形成する工程と、
前記チャネル領域のチャネル長方向の両端側を挟んで互いに対向する第1及び第2主電極領域を、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一の深さで形成する工程と、
前記半導体層上に前記ゲート絶縁膜を介して第2ゲート電極を形成する工程と、
前記第2ゲート電極の下方の前記半導体層を挟んで互いに対向する第3及び第4主電極領域を、前記第1及び第2主電極領域とは異なる深さで形成する工程と、
を含む、半導体装置の製造方法。
Claims (13)
- 半導体層と、
前記半導体層の上部に設けられたチャネル領域と、
前記チャネル領域のチャネル長方向の両端側に対向して設けられた第1及び第2主電極領域と、
前記チャネル領域のチャネル幅方向の互いに対向する側面の両側に設けられた第1及び第2トレンチの内壁、並びに前記チャネル領域の上面に設けられたゲート絶縁膜と、
前記ゲート絶縁膜を介して前記第1トレンチに埋め込まれた第1凸部、前記ゲート絶縁膜を介して前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極と、
を備え、
前記第1及び第2主電極領域の深さが、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一である、半導体素子。 - 前記水平部の高さが、前記第1及び第2主電極領域の深さ以上である、請求項1に記載の半導体素子。
- 前記第1及び第2主電極領域の直下に位置する前記半導体層にエンド・オブ・レンジ欠陥を有さない、請求項1に記載の半導体素子。
- 半導体層と、前記半導体層の上部に設けられたチャネル領域と、前記チャネル領域のチャネル長方向の両端側に対向して設けられた第1及び第2主電極領域と、前記チャネル領域のチャネル幅方向の互いに対向する側面の両側に設けられた第1及び第2トレンチの内壁、並びに前記チャネル領域の上面に設けられたゲート絶縁膜と、前記ゲート絶縁膜を介して前記第1トレンチに埋め込まれた第1凸部、前記ゲート絶縁膜を介して前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極とを有する第1半導体素子と、
前記半導体層の上部に対向して設けられた第3及び第4主電極領域、前記第3及び第4主電極領域に挟まれた前記半導体層上に第2ゲート絶縁膜を介して設けられた第2ゲート電極とを有する第2半導体素子と、
を備え、
前記第1及び第2主電極領域の深さが、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一である、半導体装置。 - 前記第3及び第4主電極領域の深さが、前記第1及び第2主電極領域の深さよりも浅い、請求項4に記載の半導体装置。
- 前記第2ゲート電極の高さが、前記水平部の高さよりも低い、請求項4に記載の半導体装置。
- 前記第1半導体素子が、固体撮像装置の画素に含まれる増幅トランジスタであり、
前記第2半導体素子が、前記固体撮像装置の周辺回路に含まれるトランジスタである、
請求項4に記載の半導体装置。 - 半導体層の上部に凹部を掘り、前記凹部で区画されたチャネル領域を形成する工程と、
前記凹部に素子分離絶縁膜を埋め込む工程と、
前記素子分離絶縁膜を選択的に除去して、前記チャネル領域のチャネル幅方向の互いに対向する側面を露出する第1及び第2トレンチを掘る工程と、
前記第1及び第2トレンチの内壁、並びに前記チャネル領域の上面にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜を介して前記第1及び第2トレンチに導電性材料層を埋め込み、前記第1トレンチに埋め込まれた第1凸部、前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極を形成する工程と、
前記チャネル領域のチャネル長方向の両端側を挟んで互いに対向する第1及び第2主電極領域を、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一の深さで形成する工程と、
を含む、半導体素子の製造方法。 - 前記第1及び第2主電極領域を形成する工程は、
前記半導体層の上面に不純物イオンを注入する手順と、
前記不純物イオンを熱処理により活性化させる手順と、
を含み、
前記不純物イオンの射影飛程よりも、前記水平部の厚さを厚くする、請求項8に記載の半導体素子の製造方法。 - 前記第1及び第2主電極領域を形成する工程は、
前記チャネル領域のチャネル長方向の両端側に、互いに対向して第3及び第4トレンチを掘る手順と、
前記第3及び第4トレンチ内に導電性材料層を気相成長で埋め込むことにより、前記第1及び第2主電極領域を形成する手順と、
を含む、請求項8に記載の半導体素子の製造方法。 - 前記気相成長で埋め込む手順の前に、前記第3及び第4トレンチの底面及び側面に、前記第1及び第2主電極領域と同一導電型を呈する不純物を熱拡散で添加する手順を更に含む、請求項10に記載の半導体素子の製造方法。
- 前記気相成長で埋め込む手順の後に、
前記第1及び第2主電極領域と同一導電型を呈する不純物イオンを、前記第1及び第2主電極領域の上面に注入する手順と、
前記不純物イオンを熱処理により活性化させる手順と、
を更に含む、請求項10に記載の半導体素子の製造方法。 - 半導体層の上部に凹部を掘り、前記凹部で区画されたチャネル領域を形成する工程と、
前記凹部に素子分離絶縁膜を埋め込む工程と、
前記素子分離絶縁膜を選択的に除去して、前記チャネル領域のチャネル幅方向の互いに対向する側面を露出する第1及び第2トレンチを掘る工程と、
前記第1及び第2トレンチの内壁、並びに前記チャネル領域の上面にゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜を介して前記第1及び第2トレンチに導電性材料層を埋め込み、前記第1トレンチに埋め込まれた第1凸部、前記第2トレンチに埋め込まれた第2凸部、前記第1及び第2凸部の上端に接続され、前記チャネル領域の上面に前記ゲート絶縁膜を介して設けられた水平部を有するゲート電極を形成する工程と、
前記チャネル領域のチャネル長方向の両端側を挟んで互いに対向する第1及び第2主電極領域を、前記第1及び第2凸部の前記ゲート絶縁膜を含めた深さと同一の深さで形成する工程と、
前記半導体層上に前記ゲート絶縁膜を介して第2ゲート電極を形成する工程と、 前記第2ゲート電極の下方の前記半導体層を挟んで互いに対向する第3及び第4主電極領域を、前記第1及び第2主電極領域とは異なる深さで形成する工程と、
を含む、半導体装置の製造方法。
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- 2020-02-17 TW TW109104922A patent/TW202036914A/zh unknown
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JPH1168069A (ja) * | 1997-04-04 | 1999-03-09 | Nippon Steel Corp | 半導体装置及びその製造方法 |
JP2002151688A (ja) * | 2000-08-28 | 2002-05-24 | Mitsubishi Electric Corp | Mos型半導体装置およびその製造方法 |
JP2006121093A (ja) | 2004-10-20 | 2006-05-11 | Samsung Electronics Co Ltd | 非平面トランジスタを有する固体イメージセンサ素子及びその製造方法 |
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WO2022118654A1 (ja) * | 2020-12-04 | 2022-06-09 | ソニーグループ株式会社 | 固体撮像素子 |
Also Published As
Publication number | Publication date |
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US20220149093A1 (en) | 2022-05-12 |
TW202036914A (zh) | 2020-10-01 |
CN113383427A (zh) | 2021-09-10 |
JPWO2020183937A1 (ja) | 2020-09-17 |
EP3940791A1 (en) | 2022-01-19 |
KR20210141931A (ko) | 2021-11-23 |
EP3940791A4 (en) | 2022-09-07 |
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