JP6163904B2 - 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 description 93
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 92
- 239000004065 semiconductor Substances 0.000 title claims description 66
- 238000004519 manufacturing process Methods 0.000 title claims description 35
- 238000000034 method Methods 0.000 title claims description 32
- 239000012535 impurity Substances 0.000 claims description 214
- 238000002513 implantation Methods 0.000 claims description 46
- 239000000758 substrate Substances 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 210000000746 body region Anatomy 0.000 description 81
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229920005591 polysilicon Polymers 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 238000005468 ion implantation Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- -1 phosphorus ions Chemical class 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 238000000342 Monte Carlo simulation Methods 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 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
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- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
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- H01L21/0455—Making n or p doped regions or layers, e.g. using diffusion
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- H01L21/0455—Making n or p doped regions or layers, e.g. using diffusion
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- Electrodes Of Semiconductors (AREA)
Description
(1)本発明に従った炭化珪素半導体装置の製造方法は、第1の面(主面10a)を有し、第1の導電型を有する第1の不純物領域(ドリフト領域12)を含む炭化珪素基板10を準備する工程(S10)と、第1の面(主面10a)の少なくとも一部を覆う調整膜2と、調整膜2が少なくとも部分的に表出する開口パターンを有するマスク膜1とを形成する工程(S20)と、マスク膜1をマスクとして用いて、調整膜2を介して第1の面(主面10a)に不純物を注入することにより、第1の不純物領域(ドリフト領域12)に第2の導電型を有する第2の不純物領域(pボディ領域13)を形成する工程(S30)と、調整膜2の少なくとも一部を除去する工程(S40)とを備える。さらに、調整膜2の少なくとも一部を除去する工程(S40)の後に、マスク膜1をマスクとして用いて、第1の面(主面10a)に不純物を注入することにより、第2の不純物領域(pボディ領域13)に第1の導電型を有する第3の不純物領域(n+ソース領域14)を形成する工程(S50)を備える。
まず、図1を参照して、本実施の形態に係る炭化珪素半導体装置の構造を説明する。本実施の形態に係る炭化珪素半導体装置100は、MOSFETとして構成されている。
<検討方法>
膜厚が0.2μmであり、ポリシリコンで構成される調整膜で覆われている炭化珪素基板の主面に対して不純物を注入したときに形成される不純物領域について、不純物の注入エネルギーを10eV以上1000eV以下程度としたときの主面の面内方向の拡がりと垂直な方向における主面からの深さを計算した。計算には、モンテカルロ法を用いた。
計算結果を図12および図13に示す。図12の横軸は注入エネルギー(単位:keV)であり、縦軸は炭化珪素基板の主面の面内方向における不純物領域の拡がり幅(単位:μm)である。図13の横軸は炭化珪素基板の主面からの不純物領域の深さ(単位:μm)であり、縦軸は炭化珪素基板の主面の面内方向の拡がり幅(単位:μm)である。図12を参照して、不純物の注入エネルギーを高くしていくにつれて、主面の面内方向において不純物領域が拡がっていく傾向が確認された。また、図13を参照して、主面の面内方向において不純物領域が拡がっていくにつれて、当該不純物領域の主面からの深さは深くなっていく傾向が確認された。
Claims (7)
- 第1の面を有し、第1の導電型を有する第1の不純物領域を含む炭化珪素基板を準備する工程と、
前記第1の面の少なくとも一部を覆う調整膜と、前記調整膜が少なくとも部分的に表出する開口パターンを有するマスク膜とを形成する工程と、
前記マスク膜をマスクとして用いて、前記調整膜を介して前記第1の面に不純物を注入することにより、前記第1の不純物領域に第2の導電型を有する第2の不純物領域を形成する工程と、
前記調整膜の少なくとも一部を除去する工程と、
前記調整膜の少なくとも一部を除去する工程の後、前記マスク膜をマスクとして用いて、前記第1の面に不純物を注入することにより、前記第2の不純物領域に第1の導電型を有する第3の不純物領域を形成する工程とを備え、
前記除去する工程では、前記第1の面上に前記調整膜の一部が残存するように前記調整膜の膜厚を減少させる、炭化珪素半導体装置の製造方法。 - 前記第2の不純物領域を形成する工程における不純物の注入エネルギーは、前記第3の不純物領域を形成する工程における不純物の注入エネルギーよりも高い、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1の不純物領域と前記第3の不純物領域とに挟まれる前記第2の不純物領域の一部分に、電圧を印加する電極を形成する工程をさらに備える、請求項1または請求項2に記載の炭化珪素半導体装置の製造方法。
- 前記調整膜を構成する材料は、多結晶シリコン、チタン、および二酸化珪素からなる群から選択される、請求項1〜請求項3のいずれか1項に記載の炭化珪素半導体装置の製造方法。
- 前記第2の不純物領域を形成する工程において、前記調整膜の厚みは0.05μm以上1.0μm以下であり、前記第3の不純物領域を形成する工程において、前記調整膜の厚みは0.95μm以下である、請求項1〜請求項4のいずれか1項に記載の炭化珪素半導体装置の製造方法。
- 前記第1の導電型はn型であり、前記第2の導電型はp型であり、
前記第2の不純物領域を形成する工程では、不純物としてアルミニウムまたはホウ素を注入し、
前記第3の不純物領域を形成する工程では、不純物としてリンを注入する、請求項1〜請求項5のいずれか1項に記載の炭化珪素半導体装置の製造方法。 - 前記第2の不純物領域を形成する工程における不純物の注入エネルギーは10keV以上1000keV以下であり、前記第3の不純物領域を形成する工程における不純物の注入エネルギーは10keV以上500keV以下である、請求項1〜請求項6のいずれか1項に記載の炭化珪素半導体装置の製造方法。
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JP2013128506A JP6163904B2 (ja) | 2013-06-19 | 2013-06-19 | 炭化珪素半導体装置の製造方法 |
US14/899,310 US20160133707A1 (en) | 2013-06-19 | 2014-05-09 | Silicon carbide semiconductor device and method for manufacturing same |
PCT/JP2014/062425 WO2014203645A1 (ja) | 2013-06-19 | 2014-05-09 | 炭化珪素半導体装置およびその製造方法 |
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JP7407472B2 (ja) | 2020-05-26 | 2024-01-04 | 株式会社レーベン | 保護具付き装着品及び保護具 |
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JP4193596B2 (ja) * | 2003-06-09 | 2008-12-10 | 三菱電機株式会社 | 炭化珪素半導体装置の製造方法 |
JP4627272B2 (ja) * | 2006-03-09 | 2011-02-09 | 三菱電機株式会社 | 炭化珪素半導体装置および炭化珪素半導体装置の製造方法 |
JP2011159797A (ja) * | 2010-02-01 | 2011-08-18 | Mitsubishi Electric Corp | 半導体装置 |
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JP2015005556A (ja) | 2015-01-08 |
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