JP6041292B2 - 炭化珪素半導体素子の製造方法 - Google Patents
炭化珪素半導体素子の製造方法 Download PDFInfo
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 153
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 147
- 239000004065 semiconductor Substances 0.000 title claims description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title description 25
- 239000000758 substrate Substances 0.000 claims description 101
- 239000010410 layer Substances 0.000 claims description 78
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims description 21
- 229910003468 tantalcarbide Inorganic materials 0.000 claims description 21
- 239000002344 surface layer Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 12
- 229920002120 photoresistant polymer Polymers 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- 238000001312 dry etching Methods 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000004380 ashing Methods 0.000 description 3
- 238000005468 ion implantation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 241000286209 Phasianidae Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- YNAAFGQNGMFIHH-UHFFFAOYSA-N ctk8g8788 Chemical compound [S]F YNAAFGQNGMFIHH-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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Description
本発明の実施の形態1にかかる炭化珪素半導体素子の製造方法について説明する。図1は、本発明の実施の形態1にかかる炭化珪素半導体素子の製造途中の状態を示す説明図である。図1(a)は、図1(b)の切断線A−A’における断面構造を示す断面図であり、アライメントマーク10のp-型エピタキシャル層2形成後の状態を示す要部断面図である。図1(b)は、アライメントマーク10の平面形状を示す平面図である。
次に、実施の形態2にかかる炭化珪素半導体素子の製造方法について説明する。実施の形態2にかかる炭化珪素半導体素子の製造方法が実施の形態1にかかる炭化珪素半導体素子の製造方法と異なる点は、n-型炭化珪素基板の主表面に十字状の平面形状で凸状に成長させた炭化珪素エピタキシャル層をアライメントマークとする点である。具体的には、実施の形態2にかかる炭化珪素半導体素子の製造方法においては、次のようにアライメントマークを形成する。
次に、実施の形態3にかかる炭化珪素半導体素子の製造方法について説明する。実施の形態3にかかる炭化珪素半導体素子の製造方法が実施の形態1にかかる炭化珪素半導体素子の製造方法と異なる点は、n-型炭化珪素基板の主表面から凹状に凹んだアライメントマークを形成し、アライメントマークを含む領域を炭化タンタル膜で被覆する点である。具体的には、実施の形態3にかかる炭化珪素半導体素子の製造方法においては、次のようにアライメントマークを形成する。
次に、本発明の実施の形態にかかる炭化珪素半導体素子の製造方法によって製造された炭化珪素半導体素子のセルピッチについて検証した。まず、実施の形態1にしたがいアライメントマークを形成し、当該アライメントマークを複数枚のフォトマスクの位置合わせに使用する位置認識用ターゲットとしてMOSFETを作製した(以下、実施例1とする)。また、比較として、従来のアライメントマークを位置認識用ターゲットとしてMOSFETを作製した(以下、従来例とする)。
2 p-型エピタキシャル層
10 アライメントマーク
10a {0001}面テラス部
X アライメントマークのn-型炭化珪素基板の主表面に平行な幅
Y p-型エピタキシャル層の膜厚
θ n-型炭化珪素基板1のオフ角
w1 アライメントマークの十字状の平面形状を構成する矩形の短手方向の幅
w2 アライメントマークの十字状の平面形状を構成する矩形の長手方向の幅
Claims (3)
- 炭化珪素基板の<0001>c軸が当該炭化珪素基板の主面の法線方向から<11−20>方向にθだけ傾いている面を主面とし、アライメントマークが形成される領域の周囲を囲むように前記炭化珪素基板の主表面層を除去して凸状の前記アライメントマークを残す工程と、
前記炭化珪素基板の主表面に、前記アライメントマークを覆うようにエピタキシャル層を成長させる工程と、
を含み、
前記アライメントマークの前記炭化珪素基板の主表面に平行な幅Xは、前記エピタキシャル層の膜厚Yとの関係においてY≧X・tanθを満たすことを特徴とする炭化珪素半導体素子の製造方法。 - 炭化珪素基板の<0001>c軸が当該炭化珪素基板の主面の法線方向から<11−20>方向にθだけ傾いている面を主面とし、前記炭化珪素基板の主表面の、アライメントマークが形成される領域以外の領域を炭化タンタル膜で被覆する工程と、
前記炭化タンタル膜で被覆された側の前記炭化珪素基板の主表面に、前記アライメントマークとなる凸状の第1エピタキシャル層を成長させる工程と、
前記炭化タンタル膜を除去する工程と、
前記炭化珪素基板の主表面に、前記アライメントマークを覆うように第2エピタキシャル層を成長させる工程と、
を含み、
前記アライメントマークの前記炭化珪素基板の主表面に平行な幅Xは、前記第2エピタキシャル層の膜厚Yとの関係においてY≧X・tanθを満たすことを特徴とする炭化珪素半導体素子の製造方法。 - 前記アライメントマークを、長手方向が<11−20>方向に対して45度傾いた2つの矩形が直交する十字状の平面形状となるように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素子の製造方法。
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JP2012104236A JP6041292B2 (ja) | 2012-04-27 | 2012-04-27 | 炭化珪素半導体素子の製造方法 |
US14/397,141 US9236248B2 (en) | 2012-04-27 | 2013-03-18 | Fabrication method of silicon carbide semiconductor element |
PCT/JP2013/057744 WO2013161450A1 (ja) | 2012-04-27 | 2013-03-18 | 炭化珪素半導体素子の製造方法 |
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JP2015032611A (ja) * | 2013-07-31 | 2015-02-16 | 住友電気工業株式会社 | 炭化珪素半導体装置の製造方法 |
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