WO2013080417A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2013080417A1 WO2013080417A1 PCT/JP2012/006455 JP2012006455W WO2013080417A1 WO 2013080417 A1 WO2013080417 A1 WO 2013080417A1 JP 2012006455 W JP2012006455 W JP 2012006455W WO 2013080417 A1 WO2013080417 A1 WO 2013080417A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 95
- 239000012535 impurity Substances 0.000 claims abstract description 82
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 46
- 239000011574 phosphorus Substances 0.000 claims abstract description 46
- 230000007423 decrease Effects 0.000 claims abstract description 25
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 18
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 245
- 239000004575 stone Substances 0.000 claims description 47
- 230000015572 biosynthetic process Effects 0.000 claims description 32
- 239000002344 surface layer Substances 0.000 claims description 13
- 230000015556 catabolic process Effects 0.000 description 33
- 230000009467 reduction Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000007547 defect Effects 0.000 description 11
- 238000009792 diffusion process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 7
- 238000005468 ion implantation Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011669 selenium Substances 0.000 description 4
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 238000012217 deletion Methods 0.000 description 3
- 230000037430 deletion Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 229910052711 selenium Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005224 laser annealing Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
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- 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
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/10—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/1095—Body region, i.e. base region, of DMOS transistors or IGBTs
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
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- 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
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/083—Anode or cathode regions of thyristors or gated bipolar-mode devices
- H01L29/0834—Anode regions of thyristors or gated bipolar-mode devices, e.g. supplementary regions surrounding anode regions
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- 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
- H01L29/30—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface
- H01L29/32—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface the imperfections being within the semiconductor body
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- 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
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
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- 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
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
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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
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
Definitions
- the present disclosure relates to a semiconductor device having a vertical semiconductor element.
- a semiconductor device having a vertical semiconductor element used for a power supply circuit such as an EHV inverter or a DC-DC converter.
- an IGBT is used as a vertical semiconductor element.
- an element structure called a field stop (hereinafter referred to as FS) layer has been proposed and put into practical use.
- the back surface of the substrate on which the element is fabricated is thinly cut, and impurities such as phosphorus (P) and selenium (Se) are ion-implanted into the back surface and then annealed, so that the impurity layer higher than the raw stone concentration of the substrate
- the FS layer consisting of
- Patent Document 1 proposes a technique of using protons, doping protons with an accelerator, and then annealing to form a deep FS layer.
- Patent Document 2 also proposes a technique for forming an FS layer by ion implantation of phosphorus in addition to protons.
- Patent Documents 3 and 4 also propose a technique for producing a multistage FS layer by injecting protons a plurality of times.
- FIG. 15 is a graph showing the relationship between the peak concentration and the activation rate with respect to the dose when protons are doped with an acceleration voltage of 4.3 MeV. As shown in this figure, it can be seen that the activation rate of protons is greatly reduced when the dose is increased.
- a high impurity concentration of about 1 ⁇ 10 15 cm ⁇ 3 is necessary for forming the FS layer, but the activation rate is low and the proton irradiation time is long. For this reason, if the FS layer is simply formed using protons, the productivity is poor and the product cost is deteriorated.
- the IGBT has been described as an example of the vertical semiconductor element, but the same problem as described above is possible as long as it is a free wheel diode (FWD) or DMOS and can form an FS layer. Can occur.
- FWD free wheel diode
- DMOS DMOS
- an object of the present disclosure is to provide a semiconductor device having a vertical semiconductor element having a structure capable of preventing deterioration of product cost, ensuring a withstand voltage, and suppressing a switching surge.
- a semiconductor device including a vertical semiconductor element configured to pass a current between an upper electrode and a lower electrode, wherein the FS layer is made of phosphorus or arsenic.
- the FS layer is composed of the phosphorus / arsenic layer and the proton layer and the impurity concentration of the proton layer is gradually reduced, the proton layer is compared with the case where the FS layer is composed only of protons. It becomes possible to reduce the impurity concentration. For this reason, it becomes possible to improve productivity compared with the case where the FS layer is formed by simply injecting protons, and it is possible to prevent deterioration of product cost.
- the n-type impurity concentration of the proton layer is continuously reduced gradually at a position deeper from the back surface of the drift layer than the phosphorus / arsenic layer. For this reason, the difference in n-type impurity concentration at the boundary position between the proton layer and the drift layer becomes gradual. Therefore, the electric field concentration can be relaxed, the withstand voltage can be secured, and the switching surge can be suppressed.
- the relationship between the proton layer depth and the concentration ratio of the proton layer to the raw stone concentration is x, where the proton layer depth is x and the concentration ratio is y.
- Equation 1 y ⁇ 19.061 ⁇ 10 ⁇ 0.00965x Meet.
- the amount of decrease in the breakdown voltage can be suppressed, and the breakdown voltage yield can be improved.
- the concentration ratio of the proton layer to the raw stone concentration is set to 3 times or more. Therefore, the amount of decrease in breakdown voltage can be suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is set to 4 times or more. Therefore, the amount of decrease in breakdown voltage can be further suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is set to 4 times or more. Therefore, the amount of decrease in breakdown voltage can be suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is 7 times or more. Therefore, the amount of decrease in breakdown voltage can be further suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is 7 times or more. Therefore, the amount of decrease in breakdown voltage can be suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is 10 times or more. Therefore, the amount of decrease in breakdown voltage can be further suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is 10 times or more. Therefore, the amount of decrease in breakdown voltage can be suppressed.
- the concentration ratio of the proton layer to the raw stone concentration is 14 times or more. Therefore, the amount of decrease in breakdown voltage can be further suppressed.
- the vertical semiconductor element is an IGBT.
- the vertical semiconductor elements are IGBTs and free wheel diodes.
- the vertical semiconductor element is a diode.
- the drawing (A) is a top surface layout diagram of a semiconductor device provided with an IGBT as a vertical semiconductor element according to the first embodiment of the present disclosure, and (b) is a cross-sectional view taken along the line IB-IB in FIG.
- (A) is a graph showing a designed impurity concentration profile in the IIA-IIA section in FIG. 1 (b), and (b) is a completed impurity concentration in the IIB-IIB section in FIG. 1 (b). It is a graph which shows a profile.
- (A) is the figure which showed the relationship with the half value width (DELTA) R (micrometer) with respect to a proton acceleration voltage (MeV), and the range Rp
- (b) is the depth (range) Rp and the proton concentration N. It is the figure which showed the relationship. It is a graph which shows the result of having investigated the relationship between the n-type impurity density
- FIG. 11A is a top surface layout diagram of a semiconductor device provided with IGBTs and diodes as vertical semiconductor elements according to the second embodiment of the present disclosure
- FIG. 11B is a cross-sectional view along XIB-XIB in FIG.
- FIG. 12C is a sectional view taken along the line XIC-XIC in FIG. FIG.
- FIG. 11A is a graph showing the impurity concentration profile at the section XIIA-XIIA in FIG. 11B
- FIG. 11B is a graph showing the impurity concentration profile at the section XIIB-XIIB in FIG. is there.
- FIG. 13A is a top surface layout diagram of a semiconductor device provided with a diode as a vertical semiconductor element according to a second embodiment of the present disclosure
- FIG. 13B is a cross-sectional view taken along the line XIIIB-XIIIB in FIG. 14 is a graph showing an impurity concentration profile on the XIV-XIV cross section in FIG. It is the figure which showed the relationship between the peak density
- FIGS. 1A and 1B are diagrams showing a semiconductor device provided with an IGBT as a vertical semiconductor element.
- FIG. 1A is a top layout view
- FIG. 1B is a diagram in FIG. It is IB-IB sectional drawing in the inside.
- 2 (a) and 2 (b) are graphs showing the impurity concentration in the section IIAB-IIAB in FIG. 1 (b).
- FIG. 2 (a) is a design concentration profile of each part
- FIG. 2 (b) shows the finished density profile.
- the semiconductor device of this embodiment will be described with reference to these drawings.
- the IGBT formation region provided with the IGBT 100 shown in FIG. 1B is a cell region, and an outer peripheral withstand voltage region is provided in the outer periphery of the cell region. That is, a cell region is formed at the center of the chip constituting the semiconductor device, and an outer peripheral pressure-resistant region is disposed at the outer periphery of the cell region, that is, at the outer edge of the chip.
- the semiconductor device of this embodiment is configured by including an IGBT 100 with respect to a semiconductor substrate constituting the n ⁇ -type drift layer 1.
- the n ⁇ type drift layer 1 is composed of a raw stone concentration, and the n type impurity concentration is 1 ⁇ 10 14 cm ⁇ 3 or less, for example, 0.75 ⁇ 10 14 cm ⁇ 3 as shown in FIG.
- an FS layer 2 composed of an n-type layer is formed on the surface layer portion of the n ⁇ -type drift layer 1 on the back surface side of the n ⁇ -type drift layer 1.
- the FS layer 2 includes a phosphorus FS layer 2a having phosphorus (P) formed as an impurity from a back surface of the n ⁇ type drift layer 1 to a relatively shallow predetermined depth, and a phosphorus FS layer 2 from the back surface of the n ⁇ type drift layer 1.
- the structure includes a proton FS layer 2b having protons formed as impurities as deeper than the FS layer 2a. As shown in FIG.
- the phosphorus FS layer 2a has a diffusion depth of 1.5 ⁇ m or less and an n-type impurity concentration of 1 ⁇ 10 16 cm ⁇ 3 or less
- the proton FS layer 2b has a diffusion depth of, for example, It is 15 ⁇ m or less and the n-type impurity concentration is 5 ⁇ 10 14 cm ⁇ 3 or less.
- the impurity concentration of the proton FS layer 2b is preferably higher because it is preferably higher than 5 ⁇ 10 14 cm ⁇ 3 , but here, for example, 3 ⁇ 10 14 cm ⁇ 3 or more and 5 ⁇ 10 14 cm ⁇ . The range is 3 or less.
- the proton FS layer 2b has an impurity concentration peak located in the phosphorous FS layer 2a, and the n-type impurity concentration continuously increases at a position deeper from the back surface of the n ⁇ -type drift layer 1 than the phosphorous FS layer 2a.
- the concentration distribution gradually decreases.
- a p + type impurity region 3 corresponding to the collector region is formed in the surface layer portion of the FS layer 2 configured as described above.
- the p + -type impurity region 3 is formed by implanting a p-type impurity such as boron, and has a diffusion depth of 0.5 ⁇ m or less and a p-type impurity concentration of 1 ⁇ 10 18 or less as shown in FIG. Has been.
- a p-type region 4 having a thickness of, for example, about 3 ⁇ m is formed in the surface layer portion of the n ⁇ -type drift layer 1.
- a plurality of trenches 6 are formed so as to penetrate the p-type region 4 and reach the n ⁇ -type drift layer 1, and the trench 6 separates the p-type region 4 into a plurality of pieces.
- a plurality of trenches 6 are formed at a predetermined pitch (interval), and each trench 6 is formed in the vertical direction on the paper surface in FIG. 1A, that is, in the depth direction (the vertical direction on the paper surface) in FIG.
- annular structure for example, a plurality of annular structures formed by each trench 6 constitute a multiple ring structure.
- the p-type region 4 is divided into a plurality of parts by the adjacent trenches 6, but a part of the p-type region 4 becomes a channel p-type region 4 a constituting the channel region, and the emitter region is formed in the surface layer portion of the channel p-type region 4 a.
- An n + type impurity region 5 corresponding to is formed.
- the channel p-type region 4a in which the n + -type impurity region 5 is formed serves as an IGBT operation unit that is allowed to perform an IGBT operation by forming a channel.
- the remaining p-type region 4b in which the n + -type impurity region 5 is not formed in the p-type region 4 serves as a thinning portion, and the IGBT operation is not performed.
- a high-concentration body p-type layer 4c is formed between the surface layer portion of the channel p-type region 4a, specifically, between the n + -type impurity regions 5 arranged on both sides of the channel p-type region 4a. Is formed. For this reason, the surface concentration of the p-type impurity concentration of the p-type region 4 is set to a high concentration in the IGBT operation portion, and the surface concentration of the p-type impurity concentration is set to a low concentration in the p-type region 4b serving as the thinning-out portion.
- the surface concentration of the p-type impurity concentration of the body p-type region 4c is 4 ⁇ 10 19 cm ⁇ 3
- the surface concentration of the p-type impurity concentration of the p-type region 4 is high in the IGBT operation portion. Concentration.
- the n + -type impurity region 5 has a higher impurity concentration than the n ⁇ -type drift layer 1, terminates in the p-type region 4, and is disposed so as to be in contact with the side surface of the trench 6. More specifically, the structure extends in the shape of a rod along the longitudinal direction of the trench 6 and terminates inside the tip of the trench 6.
- the trenches 6 are deeper than the p-type region 4 and have a depth of 3.0 to 6.0 ⁇ m, and are arranged at a predetermined pitch as described above.
- a gate insulating film 7 formed so as to cover the inner wall surface of each trench 6, and a gate electrode 8 constituted by doped Poly-Si or the like formed on the surface of the gate insulating film 7. And embedded by.
- the gate electrodes 8 are electrically connected to each other in a cross section different from that shown in FIG. 1, and a gate voltage having the same potential is applied thereto.
- n + -type impurity region 5 and the channel p-type region 4a are electrically connected to the upper electrode 10 corresponding to the emitter electrode through a contact hole 9a formed in the interlayer insulating film 9, and although not shown, A passivation film is formed so as to protect the electrode 10 and the wiring. Then, the lower electrode 11 is formed on the back surface side of the p + -type impurity region 3, thereby configuring the IGBT 100.
- an n-type region (hole stopper (HS) layer) 20 is provided so as to connect the adjacent trenches 6 at an intermediate position in the depth direction of the p-type region 4b in the p-type region 4b of the thinning portion.
- HS hole stopper
- an outer peripheral withstand voltage structure is configured such that a p-type guard ring layer is formed as a multiple ring structure so as to surround the outer periphery of the p-type diffusion layer.
- a semiconductor device including the IGBT 100 according to the present embodiment is configured by the structure as described above. Next, a method for manufacturing the semiconductor device configured as described above will be described. However, since the semiconductor device having the structure as in the present embodiment can be manufactured by a manufacturing method almost the same as that of the semiconductor device having the conventional structure, portions different from the conventional one will be mainly described.
- a semiconductor substrate serving as a raw stone constituting the n ⁇ -type drift layer 1 is prepared, and surface processing such as polishing for surface flattening is performed as a raw stone processing step.
- An ion implantation and thermal diffusion process for forming the impurity region 5 is performed.
- a contact hole 9a forming step is performed, and an upper electrode 10 is formed by patterning an electrode material such as Al.
- a passivation film such as polyimide is formed. Thereby, the manufacturing process on the substrate surface side is completed.
- the back surface side of the semiconductor substrate constituting the n ⁇ type drift layer 1 is ground to a desired thickness, and then etched as necessary to flatten the surface.
- phosphorus ion implantation for forming the phosphorus FS layer 2a and boron (B) ion implantation for forming the p + -type impurity region 3 are performed.
- a local heat treatment that does not affect the surface side is performed by laser annealing, and a diffusion process of implanted ions is performed.
- a formation process of the proton FS layer 2b such as a proton irradiation process and a low temperature annealing process is performed.
- protons are dosed using an accelerator, for example, with an acceleration voltage of 4 MeV and a dose of 1 ⁇ 10 13 cm ⁇ 2 or more.
- an accelerator for example, with an acceleration voltage of 4 MeV and a dose of 1 ⁇ 10 13 cm ⁇ 2 or more.
- the proton FS layer 2b has an impurity concentration peak located in the phosphorus FS layer 2a and deeper from the back surface of the n ⁇ type drift layer 1 than the phosphorus FS layer 2a. At the position, the n-type impurity concentration continuously and gradually decreases.
- the relationship between the full width at half maximum ⁇ R ( ⁇ m) and the range Rp with respect to the proton acceleration voltage (MeV) as shown in FIG. 3A is shown, and the depth (range) Rp as shown in FIG. And the proton concentration N are shown.
- the width of the proton FS layer 2b can be returned by the acceleration voltage.
- the peak depth Rp can be appropriately adjusted depending on the thickness of the absorber (absorbent).
- the FS layer 2 is constituted by the phosphorus FS layer 2a and the proton FS layer 2b, and the impurity concentration of the proton layer (2b) is gradually reduced.
- the impurity concentration of the proton FS layer 2b can be reduced as compared with the case where the FS layer 2 is constituted only by protons. For this reason, it becomes possible to improve productivity compared with the case where the FS layer 2 is configured by simply injecting protons, and it is possible to prevent the product cost from deteriorating.
- the n-type impurity concentration of the proton FS layer 2b is continuously reduced gradually at a position deeper from the back surface of the n ⁇ -type drift layer 1 than the phosphorus FS layer 2a. For this reason, the difference in n-type impurity concentration at the boundary position between the proton FS layer 2b and the n ⁇ -type drift layer 1 becomes gradual. Therefore, the electric field concentration can be alleviated, the withstand voltage can be secured, and the switching surge can be reduced.
- the FS layer 2 is configured such that the proton FS layer 2b has a diffusion depth of 15 ⁇ m or less and the n-type impurity concentration is 3 ⁇ 10 14 cm ⁇ 3 or more, for example. These numerical values are set based on the experimental results of the withstand voltage when it is assumed that the phosphorus FS layer 2a is deficient.
- 6 is a graph showing the result of examining the relationship between the n-type impurity concentration of the proton FS layer 2b and the withstand voltage by the withstand voltage calculation using Sim while changing the defect width of the defect.
- the breakdown voltage of the semiconductor device is basically determined according to the n-type impurity concentration of the proton FS layer 2b, specifically, the concentration ratio of the proton FS layer 2b to the raw stone concentration. The higher the value, the higher the withstand voltage.
- defect width 0 ⁇ m
- a breakdown voltage of 1400 to 1500 V can be obtained.
- the breakdown voltage decreases according to the width of the defect.
- the amount of decrease varies depending on the depth Xj of the proton FS layer 2b, and as the depth Xj becomes deeper, the amount of decrease can be smaller even if the concentration ratio of the proton FS layer 2b to the raw stone concentration is smaller.
- the impurity concentration of the proton FS layer 2b is 3 ⁇ 10 14 cm. If it is ⁇ 3 or more, the reduction in the breakdown voltage of the semiconductor device can be suppressed to about half of the maximum reduction. That is, if the expected value of the withstand voltage is 1500 V, the withstand voltage at the time of the maximum decrease is about 900 V, and the amount of decrease is 600 V, so that a withstand voltage of 1200 V or more is obtained in which the amount of decrease is about half (300 V). be able to.
- the concentration ratio of the proton FS layer 2b to the raw stone concentration is 4 times or more, the reduction amount of the breakdown voltage is reduced to about half of the maximum reduction amount. It can be suppressed. More preferably, when the impurity concentration of the proton FS layer 2b is 5 ⁇ 10 14 cm ⁇ 3 or more, that is, the concentration ratio of the proton FS layer 2b to the raw stone concentration is 7 times or more, a withstand voltage of 1300 V or more can be obtained.
- the impurity concentration of the proton FS layer 2b is 5 ⁇ 10 14 cm ⁇ 3 or more. If so, the amount of decrease in breakdown voltage of the semiconductor device can be suppressed to about half of the maximum amount of decrease.
- the concentration ratio of the proton FS layer 2b to the raw stone concentration is 7 times or more, the reduction amount of the breakdown voltage is reduced to about half of the maximum reduction amount. It can be suppressed.
- the impurity concentration of the proton FS layer 2b is 7 ⁇ 10 14 cm ⁇ 3 or more, that is, the concentration ratio of the proton FS layer 2b to the raw stone concentration is 10 times or more, a withstand voltage of 1300 V or more can be obtained.
- the impurity concentration of the proton FS layer 2b is 7 ⁇ 10 14 cm ⁇ 3. If it is above, the fall amount of the proof pressure of a semiconductor device can be suppressed to about half of the maximum fall amount. In this case, since the raw stone concentration is set to 0.75 ⁇ 10 14 cm ⁇ 3 , if the concentration ratio of the proton FS layer 2b to the raw stone concentration is 10 times or more, the reduction amount of the breakdown voltage is reduced to about half of the maximum reduction amount. It can be suppressed.
- the impurity concentration of the proton FS layer 2b is 1 ⁇ 10 15 cm ⁇ 3 or more, that is, if the concentration ratio of the proton FS layer 2b to the raw stone concentration is 14 times or more, Can be obtained.
- FIG. 7 is a graph summarizing the Sim pressure resistance calculation results.
- the peak depth Rp of the proton FS layer 2b is set to 0 ⁇ m.
- the same result as each of the above results is obtained.
- the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration is 3 times or more, and the amount of decrease in pressure resistance can be halved. It is possible to further reduce the amount of pressure drop. Further, when the depth Xj of the proton FS layer 2b is 15 ⁇ m or less, the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration can be reduced by 4 times or more, and the breakdown voltage reduction amount can be reduced by half.
- the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration is 7 times or more, and the withstand pressure reduction amount can be halved.
- the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration can be reduced by 10 times or more, and the breakdown voltage reduction amount can be halved.
- the range in which the amount of decrease in the withstand voltage can be halved is an effective range for improving the withstand voltage yield, and the range in which the amount of withstand pressure reduction can be further reduced is a more preferable range for improving the withstand pressure yield.
- the effective range of the breakdown voltage yield improvement and the more preferable range are approximated, it is expressed as a curve shown in FIG.
- this approximate curve is expressed as a mathematical expression, the function expression is expressed as, for example, Expressions 1 and 2.
- x indicates the depth Xj and y of the proton FS layer 2b, and the values on the boundary line of the effective range of the breakdown voltage yield improvement and the more preferable range.
- the breakdown voltage yield can be improved by setting the depth Xj of the proton FS layer 2b and the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration so as to be a value equal to or greater than y shown in Equation 1 above. It can be done effectively. If the concentration ratio is set so as to be a value equal to or greater than y represented by the above Equation 2, the breakdown voltage yield can be further effectively improved.
- the recovery rate of the contact failure failure that is, the failure failure due to the loss of the phosphorous FS layer 2 a was examined by changing the proton dose.
- the raw stone concentration was set to 7 ⁇ 10 13 cm ⁇ 3 and the depth Xj of the proton FS layer 2b was set to about 10 to 13 ⁇ m.
- the peak concentration of the proton FS layer 2b shown in FIG. 9 indicates the peak concentration of the impurity concentration in the proton FS layer 2b when the proton dose is set to a predetermined value.
- the proton dose scale is replaced with the peak concentration scale of the proton FS layer 2b when the raw stone concentration is 7 ⁇ 10 13 cm ⁇ 3.
- the breakdown voltage is defined based on the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration, but basically, the breakdown voltage design is determined by the concentration of the rough stone, and the breakdown voltage is determined by the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration. Is decided. Therefore, by selecting the concentration ratio of the proton FS layer 2b with respect to the raw stone concentration as described above, even if the raw stone concentration is changed, it is possible to reduce the withstand voltage reduction amount as described above.
- the proton FS layer 2b is formed as in the present embodiment, it is possible to eliminate He-ray irradiation performed in the vicinity of the FS layer. This will be described with reference to FIGS. 10 (a) and 10 (b).
- FIG. 11A, 11B, and 11C are diagrams showing a semiconductor device provided with an IGBT and a diode as vertical semiconductor elements.
- FIG. 11A is a top surface layout diagram
- FIG. FIG. 11A is a cross-sectional view taken along the line XIB-XIB
- FIG. 11C is a cross-sectional view taken along the line XIC-XIC in FIG. 11A.
- FIG. 12A is a graph showing a concentration profile of the impurity concentration at the XIIA-XIIA cross section in FIG. 11B
- FIG. 12B is a XIIB-XIIB cross section in FIG. 11C. It is the graph which showed the concentration profile of impurity concentration in.
- the semiconductor device of the present embodiment is configured by including an IGBT 100 and a diode 200 with respect to a semiconductor substrate constituting the n ⁇ type drift layer 1.
- the cell region is configured by an IGBT formation region in which the IGBT 100 is provided and a diode formation region in which the diode 200 is provided, and an outer peripheral withstand voltage region is provided in the outer periphery of the cell region.
- the central portion of the chip constituting the semiconductor device is an IGBT formation region or a diode formation region, and a diode formation region is provided along the IGBT formation region, and these IGBT formation regions and diode formation regions are alternately arranged.
- a cell region is configured.
- the FS layer 2 composed of the n-type layer is formed on the surface layer portion of the n ⁇ type drift layer 1 on the back surface side of the n ⁇ type drift layer 1 in the diode formation region in addition to the IGBT formation region.
- This FS layer 2 is also configured to have a phosphorus FS layer 2a and a proton FS layer 2b.
- the FS layer 2 has the same configuration as that of the first embodiment. Yes.
- ap + -type impurity region 3 corresponding to the collector region is formed in the IGBT forming region, and an n + -type impurity region 20 corresponding to the cathode region is formed in the diode forming region.
- the n + -type impurity region 20 is formed by implanting an n-type impurity such as phosphorus, and has a diffusion depth of 0.5 ⁇ m and an n-type impurity concentration of 1 ⁇ 10 20 cm ⁇ 3 , for example.
- the back surface side of the n ⁇ type drift layer 1 is mainly the p + type impurity region 3
- the n + type impurity region 20 is partially formed.
- a region where the p + -type impurity region 3 is formed is an IGBT formation region, and a region where the n + -type impurity region 20 is formed is a diode formation region.
- the IGBT formation region and the diode formation region are alternately formed with a predetermined width to form a stripe shape.
- FIG. 11A the IGBT formation region and the diode formation region are schematically shown, but in actuality, they are repeatedly arranged in a number larger than that shown.
- the p-type region 4 is partially diode-operated. That is, of the p-type region 4 partitioned by the trench 6, the channel p-type region 4a serves as an IGBT operating portion, but the p-type region 4b of the thinned-out portion serves as an anode p-type region and is operated as a diode rather than an IGBT operation. become.
- a p-type region 4 having a predetermined thickness is formed in the surface layer portion of the n ⁇ -type drift layer 1, similarly to the IGBT formation region.
- This p-type region 4 also becomes the anode p-type region 4d, and may have an impurity concentration independent of the p-type region 4 in the IGBT formation region, but in this embodiment, the anode p-type region 4b in the IGBT formation region. And the same impurity concentration.
- a PN junction diode 200 is configured with the anode p-type region 4d as an anode and the n ⁇ -type drift layer 1 and the n + -type impurity region 3 as a cathode.
- the diode 200 has a structure in which the upper electrode 10 is electrically connected as an anode electrode to the anode p-type region 4d and the lower electrode 12 is electrically connected as a cathode electrode to the n + -type impurity region 3. Has been.
- the IGBT 100 and the diode 200 have a structure in which the emitter and the anode are electrically connected, and the collector and the cathode are electrically connected, so that they are connected in parallel to each other in the same chip. .
- the semiconductor device including the IGBT 100 and the diode 200 according to the present embodiment is configured by the above structure.
- the FS layer 2 is configured by the phosphorus FS layer 2a and the proton FS layer 2b, and these are configured in the same manner as in the first embodiment. The same effect as the embodiment can be obtained.
- a diode is formed as a vertical semiconductor element, which is basically the same as the configuration of the diode formation region of the second embodiment, and therefore only the parts different from the second embodiment. explain.
- FIGS. 13A and 13B are diagrams showing a semiconductor device provided with a diode as a vertical semiconductor element.
- FIG. 13A is a top layout view
- FIG. 13B is a diagram in FIG. It is XIIIB-XIIIB sectional drawing in the inside.
- FIG. 14 is a graph showing a concentration profile of the impurity concentration on the XIV-XIV cross section in FIG.
- the semiconductor device of this embodiment is configured by including a diode 200 with respect to the semiconductor substrate constituting the n ⁇ -type drift layer 1.
- the cell region is constituted by a diode forming region in which the diode 200 is provided, and an outer peripheral withstand voltage region is provided in the outer peripheral portion of the cell region.
- a cell region is configured by forming a central portion of a chip constituting the semiconductor device as a diode formation region.
- an FS layer 2 composed of an n-type layer is formed on the surface layer portion of the n ⁇ -type drift layer 1 on the back surface side of the n ⁇ -type drift layer 1.
- the FS layer 2 is also configured to have a phosphorus FS layer 2a and a proton FS layer 2b, and has the same configuration as that of the second embodiment, for example, as shown in the concentration profile of FIG.
- An n + -type impurity region 20 corresponding to the cathode region is formed in the surface layer portion of the FS layer 2.
- the n + -type impurity region 20 has the same configuration as that of the second embodiment.
- a p-type region 4 functioning as an anode p-type region is formed on the surface of the n ⁇ -type drift layer 1, and an upper surface electrode 10 is formed on this surface. Then, the lower electrode 11 is formed on the surface of the n + -type impurity region 20, thereby forming the diode 200.
- a semiconductor device including the diode 200 according to the present embodiment is configured.
- the FS layer 2 is configured by the phosphorus FS layer 2a and the proton FS layer 2b, and these are configured in the same manner as in the second embodiment. The same effect as the form can be obtained. (Other embodiments) Although this indication was described based on an embodiment, it is not limited to the embodiment or structure concerned. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.
- the semiconductor device in which the vertical semiconductor element is formed has been described as an example in which the IGBT 100 or the diode 200 is formed.
- another vertical semiconductor element for example, a semiconductor in which an LDMOS or the like is formed.
- the present disclosure can also be applied to an apparatus.
- the phosphorus FS layer 2a is used.
- an arsenic FS layer using arsenic (As) instead of phosphorus (P) may be used.
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Abstract
Description
(数1) y≧19.061×10-0.00965x
を満たしている。
(第1実施形態)
本開示の第1実施形態について説明する。図1(a)(b)は、縦型半導体素子としてIGBTが備えられた半導体装置を示した図であり、図1(a)は上面レイアウト図、図1(b)は図1(a)中のIB-IB断面図である。また、図2(a)(b)は、図1(b)中のIIAB-IIAB断面での不純物濃度を示したグラフであり、図2(a)は、各部の設計上の濃度プロファイル、図2(b)は出来上がりの濃度プロファイルを示してある。以下、これらの図を参照して、本実施形態の半導体装置について説明する。
(数2) y=25.939×10-0.0892x
したがって、プロトンFS層2bの深さXjと原石濃度に対するプロトンFS層2bの濃度比について、上記数式1で示されるy以上の値となるように設定されるようにすることで耐圧歩留改善を有効に行うことができる。そして、その濃度比について、上記数式2で示されるy以上の値となるように設定されるようにすれば、更に耐圧歩留改善を有効に行うことができる。
(第2実施形態)
本開示の第2実施形態について説明する。本実施形態は、第1実施形態に対して同じ半導体基板上にIGBTだけでなくダイオード(フリーホイールダイオード)を形成するようにしたものであり、その他に関しては第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
本開示の第3実施形態について説明する。本実施形態は、縦型半導体素子としてダイオードを形成するようにしたものであり、基本的には第2実施形態のダイオード形成領域の構成と同様であるため、第2実施形態と異なる部分についてのみ説明する。
(他の実施形態)
本開示は、実施形態に準拠して記述されたが、当該実施形態や構造に限定されるものではない。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。
また、上記実施形態では、リンFS層2aとしたが、リン(P)の代わりにヒ素(As)を用いたヒ素FS層としても良い。
Claims (13)
- 半導体基板にて構成される原石濃度とされたn型のドリフト層(1)と、
前記ドリフト層(1)の裏面側に形成されたn型もしくはp型の半導体領域(3、20)と、
前記半導体領域(3、20)よりも前記半導体基板の裏面から深い位置まで形成され、前記ドリフト層(1)よりも高不純物濃度とされたn型のフィールドストップ層(2)と、
前記ドリフト層(1)の表面側に形成されたp型領域(4)と、
前記ドリフト層(2)の表面側に形成され、前記p型領域(4)に接触させられた上部電極(10)と、
前記ドリフト層(2)の裏面側に形成され、前記半導体領域(3、20)と接触させられた下部電極(11)とを有し、
前記上部電極(10)と前記下部電極(11)との間において電流を流すように構成された縦型半導体素子(100、200)が備えられた半導体装置であって、
前記フィールドストップ層(2)は、リンまたはヒ素がドープされたリン/ヒ素層(2a)と、プロトンがドープされたプロトン層(2b)とを有して構成され、前記リン/ヒ素層(2a)が前記半導体基板の裏面から所定深さの位置まで形成されていると共に、前記プロトン層(2b)が前記リン/ヒ素層(2a)内において濃度ピークを有していて、前記リン/ヒ素層(2a)よりも深くまで形成され、かつ、前記リン/ヒ素層(2a)から深い位置において徐々に不純物濃度が低下した濃度分布で形成されている半導体装置。 - 前記プロトン層(2b)の深さと原石濃度に対する前記プロトン層(2b)の濃度比との関係が、前記プロトン層(2b)の深さをx、前記濃度比をyとして、y≧19.061×10-0.00965x、を満たしている請求項1に記載の半導体装置。
- 前記プロトン層(2b)の深さが20μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が3倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが20μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が4倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが15μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が4倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが15μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が7倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが10μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が7倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが10μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が10倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが7μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が10倍以上とされている請求項2に記載の半導体装置。
- 前記プロトン層(2b)の深さが7μm以下で、原石濃度に対する前記プロトン層(2b)の濃度比が14倍以上とされている請求項2に記載の半導体装置。
- 前記縦型半導体素子はIGBT(100)であり、
前記半導体領域をp型のコレクタ領域(3)とし、
前記セル領域において、所定ピッチで複数本並べられ、前記p型領域(4)よりも深く形成されることで前記p型領域(4)を複数に分け、前記p型領域(4)の少なくとも一部によってチャネルp型領域(4a)を構成するトレンチ(6)と、
前記チャネルp型領域(4a)の表層部に前記トレンチ(6)の側面に沿って形成されたn型のエミッタ領域(5)と、
前記トレンチ(6)の表面に形成されたゲート絶縁膜(7)と、
前記ゲート絶縁膜(7)の表面に形成されたゲート電極(8)とを有し、
前記上部電極(10)が前記チャネルp型領域(4a)および前記エミッタ領域(5)に接触させられていると共に、前記下部電極(11)が前記コレクタ領域(3)に接触させられている請求項1ないし10のいずれか1つに記載の半導体装置。 - 前記縦型半導体素子はIGBT(100)およびフリーホイールダイオード(200)であり、
前記p型領域(4)は、前記セル領域のうち前記IGBT(100)が形成されたIGBT形成領域と前記フリーホイールダイオード(200)が形成されたダイオード形成領域の双方に形成され、
前記IGBT形成領域には、前記半導体領域として少なくともp型のコレクタ領域(3)が形成されていると共に、所定ピッチで複数本並べられ、前記p型領域(4)よりも深く形成されることで前記p型領域(4)を複数に分け、前記p型領域(4)の少なくとも一部によってチャネルp型領域(4a)を構成するトレンチ(6)と、前記チャネルp型領域(4a)の表層部に前記トレンチ(6)の側面に沿って形成されたn型のエミッタ領域(5)と、前記トレンチ(6)の表面に形成されたゲート絶縁膜(7)と、前記ゲート絶縁膜(7)の表面に形成されたゲート電極(8)とが形成されており、
前記ダイオード形成領域には、前記半導体領域としてn型のカソード領域(20)が形成されていると共に、前記p型領域(4)によってアノードp型領域(4d)が構成されており、
前記上部電極(10)が前記チャネルp型領域(4a)および前記エミッタ領域(5)に接触させられていると共に前記アノードp型領域(4d)に接触させられ、前記下部電極(11)が前記コレクタ領域(3)に接触させられていると共に前記カソード領域(20)に接触させられている請求項1ないし10のいずれか1つに記載の半導体装置。 - 前記縦型半導体素子はダイオード(200)であり、
前記半導体領域をn型のカソード領域(20)とし、
前記p型領域(4)をアノードp型領域とし、
前記上部電極(10)が前記アノードp型領域となる前記p型領域(4)に接触させられ、前記下部電極(11)が前記カソード領域(20)に接触させられている請求項1ないし10のいずれか1つに記載の半導体装置。
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CN105793991A (zh) * | 2014-06-12 | 2016-07-20 | 富士电机株式会社 | 半导体装置 |
WO2017115434A1 (ja) * | 2015-12-28 | 2017-07-06 | 三菱電機株式会社 | 半導体装置、半導体装置の製造方法 |
JP2017126724A (ja) * | 2016-01-15 | 2017-07-20 | ローム株式会社 | 半導体装置および半導体装置の製造方法 |
JP2018082191A (ja) * | 2015-06-17 | 2018-05-24 | 富士電機株式会社 | 半導体装置 |
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JP5817686B2 (ja) | 2015-11-18 |
US9129851B2 (en) | 2015-09-08 |
JP2013138172A (ja) | 2013-07-11 |
CN103959473A (zh) | 2014-07-30 |
DE112012004985T5 (de) | 2014-09-11 |
DE112012004985B4 (de) | 2024-02-29 |
US20140299915A1 (en) | 2014-10-09 |
CN103959473B (zh) | 2016-10-05 |
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