JP2021072441A - 半導体基板の製造方法及び半導体基板 - Google Patents
半導体基板の製造方法及び半導体基板 Download PDFInfo
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- JP2021072441A JP2021072441A JP2020170262A JP2020170262A JP2021072441A JP 2021072441 A JP2021072441 A JP 2021072441A JP 2020170262 A JP2020170262 A JP 2020170262A JP 2020170262 A JP2020170262 A JP 2020170262A JP 2021072441 A JP2021072441 A JP 2021072441A
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- single crystal
- semiconductor
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- silicon
- silicon nitride
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- 239000000758 substrate Substances 0.000 title claims abstract description 196
- 239000004065 semiconductor Substances 0.000 title claims abstract description 170
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 51
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- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 115
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 115
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 110
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 108
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- 239000007789 gas Substances 0.000 claims description 16
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical group Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 claims description 9
- 239000005052 trichlorosilane Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
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- 239000000463 material Substances 0.000 description 5
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- 239000002019 doping agent Substances 0.000 description 3
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Abstract
Description
まず、本発明に係る半導体基板について説明する。図1(c)に、本発明に係る半導体基板10を示す。本発明に係る半導体基板10は、少なくとも、シリコン単結晶基板1の表面に、絶縁膜として、エピタキシャルな関係を保持した窒化シリコン膜2と、該窒化シリコン膜2上の半導体単結晶層3とを有するものである。
次に、本発明に係る半導体基板の製造方法を、図1を参照しながら説明する。
シリコンウェーハ(シリコン単結晶基板)の表面に、シリコンウェーハとエピタキシャルな関係を保持した窒化シリコン膜(絶縁膜)、該窒化シリコン膜上のSiエピタキシャル成長層(半導体単結晶層/SOI層)を有するSOIウェーハ(半導体基板)を作製し、構造の評価を行った。製造条件は、以下のとおりである。
Siウェーハ : 直径200mm、面方位(100)、
p型、10Ωcm
絶縁膜 : 窒化シリコン
SOI層 : Siエピタキシャル成長層
熱処理装置 : 枚葉式エピタキシャル成長装置
窒化シリコン膜 : N2 24slm + H2 34slm
熱処理温度1190℃
熱処理時間300秒
Si(SOI)層: トリクロロシラン 10slm
+ H2 34slm
成長温度1070℃
成長時間600秒
成長速度2.4μm/min
(SOIウェーハの構成)
Siウェーハ : 直径150mm、面方位(111)、
p型、50Ωcm
絶縁膜 : 窒化シリコン
SOI層 : Siエピタキシャル成長層
熱処理装置 : 枚葉式エピタキシャル成長装置
窒化シリコン膜 : N2 24slm + H2 34slm
熱処理温度1190℃
熱処理時間300秒
Si(SOI)層: トリクロロシラン 10slm
+ H2 34slm
成長温度1130℃
成長時間15秒
成長速度3.8μm/min
10…半導体基板。
Claims (14)
- シリコン単結晶基板の表面に、絶縁膜と、半導体単結晶層とを順次形成することによって、前記絶縁膜上に前記半導体単結晶層を有する半導体基板を製造する方法であって、少なくとも、
シリコン単結晶基板を、窒素ガス含有雰囲気下で熱処理し、絶縁膜として前記シリコン単結晶基板の表面に、前記シリコン単結晶基板とエピタキシャルな関係を保持した窒化シリコン膜を形成する工程と、
前記窒化シリコン膜上に半導体単結晶層をエピタキシャル成長する工程と、
を有することを特徴とする半導体基板の製造方法。 - 前記窒素ガス含有雰囲気下で熱処理する温度を800℃以上とすることを特徴とする請求項1に記載の半導体基板の製造方法。
- 前記熱処理装置としてエピタキシャル成長装置を用い、前記窒化シリコン膜を形成した後、前記エピタキシャル成長装置内の雰囲気ガスを半導体単結晶層成長用ガスに切り替えて前記エピタキシャル成長を行うことを特徴とする請求項1又は請求項2に記載の半導体基板の製造方法。
- 前記半導体単結晶層を、Si層、SiGe層、Ge層、化合物半導体層のいずれかとすることを特徴とする請求項1から請求項3のいずれか一項に記載の半導体基板の製造方法。
- 前記半導体単結晶層をSi層とし、該Si層のエピタキシャル成長用ガスをトリクロロシランとすることを特徴とする請求項4に記載の半導体基板の製造方法。
- 前記窒化シリコン膜の膜厚を2nm以下とすることを特徴とする請求項1から請求項5のいずれか一項に記載の半導体基板の製造方法。
- 前記窒化シリコン膜と前記半導体単結晶層とを交互に複数層形成することを特徴とする請求項1から請求項6のいずれか一項に記載の半導体基板の製造方法。
- 前記シリコン単結晶基板として、あらかじめ窒素又は酸素をドープしたシリコン単結晶基板を用いることを特徴とする請求項1から請求項7のいずれか一項に記載の半導体基板の製造方法。
- 前記シリコン単結晶基板として、面方位が(111)のシリコン単結晶基板を用いることを特徴とする請求項1から請求項8のいずれか一項に記載の半導体基板の製造方法。
- シリコン単結晶基板の表面に、絶縁膜と、該絶縁膜上の半導体単結晶層とを有する半導体基板であって、
前記絶縁膜は、前記シリコン単結晶基板とエピタキシャルな関係を保持した窒化シリコン膜であり、
前記半導体単結晶層は、エピタキシャル成長層であることを特徴とする半導体基板。 - 前記半導体単結晶層がSi層、SiGe層、Ge層、化合物半導体層のいずれかであることを特徴とする請求項10に記載の半導体基板。
- 前記窒化シリコン膜の膜厚が2nm以下であることを特徴とする請求項10又は請求項11に記載の半導体基板。
- 前記窒化シリコン膜と前記半導体単結晶層とを交互に複数層有するものであることを特徴とする請求項10から請求項12のいずれか一項に記載の半導体基板。
- 前記シリコン単結晶基板の面方位が(111)であることを特徴とする請求項10から請求項13のいずれか一項に記載の半導体基板。
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