JP7242488B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 79
- 238000004519 manufacturing process Methods 0.000 title claims description 57
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 100
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 94
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 73
- 238000010438 heat treatment Methods 0.000 claims description 63
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 54
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 50
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 42
- 239000007789 gas Substances 0.000 claims description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 21
- 239000001569 carbon dioxide Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 16
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 130
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 53
- 229910052757 nitrogen Inorganic materials 0.000 description 46
- 239000012535 impurity Substances 0.000 description 42
- 229910052799 carbon Inorganic materials 0.000 description 29
- 125000004433 nitrogen atom Chemical group N* 0.000 description 27
- 229910052710 silicon Inorganic materials 0.000 description 27
- 239000000758 substrate Substances 0.000 description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 24
- 239000010703 silicon Substances 0.000 description 23
- 238000010586 diagram Methods 0.000 description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 18
- 125000004432 carbon atom Chemical group C* 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 14
- 238000007254 oxidation reaction Methods 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 12
- 230000007547 defect Effects 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 238000005468 ion implantation Methods 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 150000001721 carbon Chemical group 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000000059 patterning Methods 0.000 description 3
- 238000000206 photolithography Methods 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910005883 NiSi Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910021334 nickel silicide Inorganic materials 0.000 description 2
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 229910018540 Si C Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 229910052786 argon Inorganic materials 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
- 230000008901 benefit Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000002513 implantation Methods 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
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Description
第1の実施形態の半導体装置の製造方法は、炭化珪素層の表面に第1の酸化シリコン膜を形成し、窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、第1の熱処理の後に、第1の酸化シリコン膜の上にゲート電極を形成する。
第2の実施形態の半導体装置の製造方法は、第1の熱処理は、1300℃以上の第1のステップと、第1のステップよりも低温で第1のステップよりも時間の長い第2のステップを有する点で、第1の実施形態の半導体装置の製造方法と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第3の実施形態の半導体装置の製造方法は、第1の熱処理の後に、酸化性雰囲気で、第1の熱処理よりも低い温度の第2の熱処理を行う点で、第1の実施形態の半導体装置の製造方法と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第4の実施形態の半導体装置の製造方法は、第1の熱処理の後に、第1の酸化シリコン膜の上に第2の酸化シリコン膜を形成する点で、第1の実施形態の半導体装置の製造方法と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第5の実施形態の半導体装置の製造方法は、第1の酸化シリコン膜が熱酸化膜である点で、第1の実施形態の半導体装置の製造方法と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する。
第6の実施形態の半導体装置の製造方法は、トレンチ内にゲート電極を備えるトレンチゲート型のMOSFETの製造方法である点で、第1の実施形態と異なっている。また、炭化珪素層のゲート絶縁層に対向する面は、m面とのオフ角が8度以下の面である点で、第1の実施形態と異なっている。以下、第1の実施形態と重複する内容については、一部記述を省略する。
28 ゲート絶縁層(第1の酸化シリコン膜)
30 ゲート電極
100 MOSFET(半導体装置)
200 MOSFET(半導体装置)
Claims (12)
- 炭化珪素層の表面に第1の酸化シリコン膜を形成し、
窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、
前記雰囲気の二酸化炭素ガスの分圧は10%以上である半導体装置の製造方法。 - 前記第1の熱処理は1500℃以下である請求項1記載の半導体装置の製造方法。
- 炭化珪素層の表面に第1の酸化シリコン膜を形成し、
窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、
前記雰囲気の窒素ガスの分圧は30%以上である半導体装置の製造方法。 - 炭化珪素層の表面に第1の酸化シリコン膜を形成し、
窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、
前記雰囲気の酸素ガス、窒素酸化物ガス、及び、水蒸気の分圧は0.01%以下である半導体装置の製造方法。 - 前記第1の熱処理の後に、前記第1の酸化シリコン膜の上にゲート電極を形成する請求項1ないし請求項4いずれか一項記載の半導体装置の製造方法。
- 前記第1の酸化シリコン膜の厚さは30nm以上100nm以下である請求項1ないし請求項5いずれか一項記載の半導体装置の製造方法。
- 炭化珪素層の表面に第1の酸化シリコン膜を形成し、
窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、
前記第1の熱処理は、1300℃以上の第1のステップと、前記第1のステップよりも低温で前記第1のステップよりも時間の長い第2のステップを有する半導体装置の製造方法。 - 炭化珪素層の表面に第1の酸化シリコン膜を形成し、
窒素ガスと二酸化炭素ガスとを含む雰囲気で、1200℃以上の第1の熱処理を行い、
前記第1の熱処理の後に、酸化性雰囲気で、前記第1の熱処理よりも低い温度の第2の熱処理を行う半導体装置の製造方法。 - 前記第2の熱処理は、600℃以上1000℃以下である請求項8記載の半導体装置の製造方法。
- 前記第1の熱処理の後に、前記第1の酸化シリコン膜の上に第2の酸化シリコン膜を形成する請求項1ないし請求項9いずれか一項記載の半導体装置の製造方法。
- 前記表面がSi面とのオフ角が8度以下の面、又は、前記表面がa面とのオフ角が8度以下の面であり、
前記第1の酸化シリコン膜が熱酸化膜である請求項1ないし請求項10いずれか一項記載の半導体装置の製造方法。 - 前記表面がC面とのオフ角が8度以下の面、又は、前記表面がm面とのオフ角が8度以下の面であり、
前記第1の酸化シリコン膜が堆積膜である請求項1ないし請求項10いずれか一項記載の半導体装置の製造方法。
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