JP2019012801A - 炭化珪素半導体装置の製造方法 - Google Patents
炭化珪素半導体装置の製造方法 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 240
- 239000004065 semiconductor Substances 0.000 title claims abstract description 159
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
- 239000000758 substrate Substances 0.000 claims abstract description 127
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims description 45
- 238000005530 etching Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 238000003763 carbonization Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 41
- 239000007789 gas Substances 0.000 description 39
- 230000015572 biosynthetic process Effects 0.000 description 17
- 235000012431 wafers Nutrition 0.000 description 12
- 229910004298 SiO 2 Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000012535 impurity Substances 0.000 description 8
- 229920002120 photoresistant polymer Polymers 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 239000002019 doping agent Substances 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 6
- 238000005468 ion implantation Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000000137 annealing Methods 0.000 description 5
- 238000001312 dry etching Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 238000000206 photolithography Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 4
- 229920005591 polysilicon Polymers 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
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- 238000010894 electron beam technology Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 239000005360 phosphosilicate glass Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000004151 rapid thermal annealing Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 such as an m plane Substances 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
- H01L29/7813—Vertical DMOS transistors, i.e. VDMOS transistors with trench gate electrode, e.g. UMOS transistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—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
- H01L29/0603—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 characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0607—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 characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration
- H01L29/0611—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 characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices
- H01L29/0615—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 characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE]
- H01L29/0619—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 characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions for preventing surface leakage or controlling electric field concentration for increasing or controlling the breakdown voltage of reverse biased devices by the doping profile or the shape or the arrangement of the PN junction, or with supplementary regions, e.g. junction termination extension [JTE] with a supplementary region doped oppositely to or in rectifying contact with the semiconductor containing or contacting region, e.g. guard rings with PN or Schottky junction
- H01L29/0623—Buried supplementary region, e.g. buried guard ring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66053—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide
- H01L29/66068—Multistep manufacturing processes of devices having a semiconductor body comprising crystalline silicon carbide the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
Description
ーを意味しており、指数の前に“−”を付けることで負の指数を表している。
本発明にかかる半導体装置は、シリコンよりもバンドギャップが広い半導体(以下、ワイドバンドギャップ半導体とする)を用いて構成される。ここでは、ワイドバンドギャップ半導体として例えば炭化珪素(SiC)を用いた半導体装置(炭化珪素半導体装置)の構造を例に説明する。
2 n-型エピタキシャル層
3 p+型領域
4 p+型ベース領域
4a 下側p+型ベース領域
4b 上側p+型ベース領域
5 n+型ドリフト領域
5a 第1n+型ドリフト領域
5b 第2n+型ドリフト領域
6 p型エピタキシャル層
7 n++型ソース領域
8 p++型コンタクト領域
9 ゲート絶縁膜
10 ゲート電極
11 層間絶縁膜
12 バリアメタル
13 ソース電極
14 ソース電極パッド
15 ドレイン電極
18 トレンチゲート
20 空洞
21 柱
22 炭化珪素半導体素子
30 炭化珪素基体
31 二酸化珪素(SiO2)膜
32 フォトレジスト
33 トレンチ
34 領域
Claims (7)
- 複数の空洞を内部に有する炭化珪素半導体基体を形成する第1工程と、
前記炭化珪素半導体基体上に炭化珪素半導体素子を形成する第2工程と、
前記炭化珪素半導体素子を前記炭化珪素半導体基体から切り出す第3工程と、
を含むことを特徴とする炭化珪素半導体装置の製造方法。 - 前記第1工程は、前記炭化珪素半導体基体の一方の主面側から形成した複数のトレンチ同士を連結させて空洞を形成する工程であって、
複数の前記トレンチの長手方向が、前記炭化珪素半導体基体の結晶軸方向<11−20>から、前記炭化珪素半導体基体に設けられたオリエンテーションフラットの形成保証精度に基づく所定角度以上ずれた方向になる複数の前記トレンチを前記炭化珪素半導体基体の一方の主面側から形成する第11工程と、
前記第11工程の後、エッチング効果のあるガスと炭化珪素膜の原料となるガスとを含むガス雰囲気下での熱処理によって、前記炭化珪素半導体基体の一方の主面側に前記炭化珪素膜を成膜するとともに、複数の前記トレンチの側壁をエッチングすることにより前記空洞を形成する第12工程と、
を含むことを特徴とする請求項1に記載の炭化珪素半導体装置の製造方法。 - 前記第2工程では、前記炭化珪素半導体素子の面積が前記空洞の面積より小さくなるように、前記空洞上に前記炭化珪素半導体素子を形成することを特徴とする請求項1または2に記載の炭化珪素半導体装置の製造方法。
- 前記第3工程では、前記炭化珪素半導体基体を切断する切断面が前記空洞内を通ることを特徴とする請求項1〜3のいずれか一つに記載の炭化珪素半導体装置の製造方法。
- 前記炭化珪素半導体基体と平行な方向の前記空洞の幅は、10μm以上5mm以下であり、前記空洞の高さは、1μm以上20μm以下であり、前記幅と前記高さと直交する方向の前記空洞の奥行きは、10μm以上5mm以下であることを特徴とする請求項1〜4のいずれか一つに記載の炭化珪素半導体装置の製造方法。
- 前記第3工程より後に、
前記切り出した炭化珪素半導体素子に裏面電極を形成する第4工程をさらに含むことを特徴とする請求項1〜5のいずれか一つに記載の炭化珪素半導体装置の製造方法。 - 前記第4工程では、前記炭化珪素半導体基体の前記空洞と接する面に前記裏面電極を形成することを特徴とする請求項6に記載の炭化珪素半導体装置の製造方法。
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003095797A (ja) * | 2001-09-26 | 2003-04-03 | Toshiba Corp | 単結晶材料の製造方法及び電子装置の製造方法 |
JP2011023658A (ja) * | 2009-07-17 | 2011-02-03 | Fuji Electric Systems Co Ltd | 半導体装置の製造方法 |
JP2012243898A (ja) * | 2011-05-18 | 2012-12-10 | Fuji Electric Co Ltd | 半導体基板または半導体装置の製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2003095797A (ja) * | 2001-09-26 | 2003-04-03 | Toshiba Corp | 単結晶材料の製造方法及び電子装置の製造方法 |
JP2011023658A (ja) * | 2009-07-17 | 2011-02-03 | Fuji Electric Systems Co Ltd | 半導体装置の製造方法 |
JP2012243898A (ja) * | 2011-05-18 | 2012-12-10 | Fuji Electric Co Ltd | 半導体基板または半導体装置の製造方法 |
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