JP7242631B2 - 酸化ケイ素上の超薄型アモルファスシリコン膜の連続性を向上させるための前処理手法 - Google Patents
酸化ケイ素上の超薄型アモルファスシリコン膜の連続性を向上させるための前処理手法 Download PDFInfo
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- JP7242631B2 JP7242631B2 JP2020503041A JP2020503041A JP7242631B2 JP 7242631 B2 JP7242631 B2 JP 7242631B2 JP 2020503041 A JP2020503041 A JP 2020503041A JP 2020503041 A JP2020503041 A JP 2020503041A JP 7242631 B2 JP7242631 B2 JP 7242631B2
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- 238000000034 method Methods 0.000 title claims description 214
- 229910021417 amorphous silicon Inorganic materials 0.000 title claims description 134
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims description 18
- 229910052814 silicon oxide Inorganic materials 0.000 title claims description 10
- 239000010410 layer Substances 0.000 claims description 152
- 230000008569 process Effects 0.000 claims description 145
- 239000000758 substrate Substances 0.000 claims description 140
- 239000007789 gas Substances 0.000 claims description 85
- 239000013545 self-assembled monolayer Substances 0.000 claims description 83
- 239000002094 self assembled monolayer Substances 0.000 claims description 80
- 239000002243 precursor Substances 0.000 claims description 62
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- 229910052710 silicon Inorganic materials 0.000 claims description 40
- 239000010703 silicon Substances 0.000 claims description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 39
- 125000006850 spacer group Chemical group 0.000 claims description 35
- 229910052739 hydrogen Inorganic materials 0.000 claims description 34
- 239000001257 hydrogen Substances 0.000 claims description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 26
- 239000012686 silicon precursor Substances 0.000 claims description 22
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- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 claims description 17
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- 229910052786 argon Inorganic materials 0.000 claims description 10
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 claims description 10
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
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- OWKFQWAGPHVFRF-UHFFFAOYSA-N n-(diethylaminosilyl)-n-ethylethanamine Chemical compound CCN(CC)[SiH2]N(CC)CC OWKFQWAGPHVFRF-UHFFFAOYSA-N 0.000 claims description 5
- 238000009616 inductively coupled plasma Methods 0.000 claims description 4
- LICVGLCXGGVLPA-UHFFFAOYSA-N disilanyl(disilanylsilyl)silane Chemical compound [SiH3][SiH2][SiH2][SiH2][SiH2][SiH3] LICVGLCXGGVLPA-UHFFFAOYSA-N 0.000 claims description 3
- GCOJIFYUTTYXOF-UHFFFAOYSA-N hexasilinane Chemical compound [SiH2]1[SiH2][SiH2][SiH2][SiH2][SiH2]1 GCOJIFYUTTYXOF-UHFFFAOYSA-N 0.000 claims description 3
- CVLHDNLPWKYNNR-UHFFFAOYSA-N pentasilolane Chemical compound [SiH2]1[SiH2][SiH2][SiH2][SiH2]1 CVLHDNLPWKYNNR-UHFFFAOYSA-N 0.000 claims description 3
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- 239000001272 nitrous oxide Substances 0.000 claims description 2
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 15
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Images
Classifications
-
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Description
集積回路は、単一チップ上に数百万個ものトランジスタ、コンデンサ、及びレジスタを含みうる、複雑なデバイスへと進化を遂げている。チップ設計の進化には、より高速な回路とより高い回路密度とが、始終必要とされる。より高い回路密度を有するより高速な回路に対する要求により、かかる集積回路の製造に使用される材料についても、相応な要求が課されている。特に、集積回路構成要素の寸法がサブミクロン単位まで小さくなるにつれ、かかる構成要素から好適な電気的性能を得るためには、今や低抵抗の導電性材料だけでなく、低誘電率の絶縁材料を使用することも必要になっている。しかし、このような低誘電率の絶縁材料は、粗さ(roughness)の問題に悩まされることが多く、これにより、後続して堆積される膜の粗さが増大し、膜同士の接着が影響を受けることもある。加えて、このような低誘電率の絶縁材料の一部は不連続であり、このことが、下層の酸化物材料の望ましくないエッチングにつながりうる。
化学式1
のものであってよく、ここでR1、R2、R3、及びR4は、同一であるか又は別々であり、それぞれ互いと関係なく、水素(H)、オプションで一又は複数のNH2基(例えばアルキルアミノ基)に置換されうる直鎖又は分枝のアルキル基(例えばメチル、エチル、プロピル、ブチルなど)、アルコキシ基(例えばメトキシ、エトキシ、プロポキシなど)、及び塩素含有基から選択される。
化学式2
のものであってよく、ここでR1、R2、及びR3は、同一であるか又は別々であり、それぞれ互いと関係なく、水素(H)、オプションで一又は複数のNH2基(例えばアルキルアミノ基)に置換されうる直鎖又は分枝のアルキル基(例えばメチル、エチル、プロピル、ブチルなど)、アルコキシ基(例えばメトキシ、エトキシ、プロポキシなど)、及び塩素含有基から選択される。
化学式3
のものであってよく、ここでR1、R2、及びR3は、同一であるか又は別々であり、それぞれ互いと関係なく、水素(H)、オプションで一又は複数のNH2基(例えばアルキルアミノ基)に置換されうる直鎖又は分枝のアルキル基(例えばメチル、エチル、プロピル、ブチルなど)、アルコキシ基(例えばメトキシ、エトキシ、プロポキシなど)、及び塩素含有基から選択される。
化学式4
のものであってよく、ここでR1、R2、及びR3は、同一であるか又は別々であり、それぞれ互いと関係なく、水素(H)、オプションで一又は複数のNH2基(例えばアルキルアミノ基)に置換されうる直鎖又は分枝のアルキル基(例えばメチル、エチル、プロピル、ブチルなど)、アルコキシ基(例えばメトキシ、エトキシ、プロポキシなど)、及び塩素含有基から選択される。
以下の非限定的な例は、本書に記載の実行形態をより詳しく例示するために提供されている。しかし、これらの例は、包括的であること、及び本書に記載の実行形態の範囲を制限することを、意図するものではない。
(態様A)
処理チャンバ内で基板上にアモルファスシリコン層を形成する方法であって、
処理空間内に配置された基板の上に、所定の厚さの犠牲誘電体層を堆積させることと、
前記犠牲誘電体層を部分的に除去して前記基板の上側表面を露出させることによって、パターニングされたフィーチャを前記基板上に形成することと、
前記パターニングされたフィーチャ上に自己組織化単分子層(self-assembled monolayer:SAM)を形成することであって、前記SAMは、ビス(ジエチルアミノ)シラン(BDEAS)、ヘキサクロロジシラン(HCDS)、(3-アミノプロピル)トリエトキシシラン(APTES)、及びオクタデシルトリクロロシラン(ODTS)を含む群から選択されるSAM前駆体から形成される、SAMを形成することと、
前記SAM上及び前記基板の露出した前記上側表面上に、アモルファスシリコン層を堆積させることと、
前記アモルファスシリコン層から形成された側壁スペーサの中に前記パターニングされたフィーチャが充填されている状態にするために、異方性エッチングプロセスを使用して、前記パターニングされたフィーチャの上側表面及び前記基板の前記上側表面から、前記アモルファスシリコン層を選択的に除去することとを含む、
方法。
(態様B)
前記SAM上及び前記パターニングされたフィーチャ上及び前記基板の前記露出した上側表面上に前記アモルファスシリコン層を堆積させることが、水素を含むアウトガス可能な化学種を有するアモルファスシリコン層を形成するために、前記パターニングされたフィーチャをケイ素前駆体に曝露することを含む、態様Aに記載の方法。
(態様C)
前記アモルファスシリコン層から前記アウトガス可能な化学種を除去してガス抜きされたアモルファスシリコン層を形成するために、前記アモルファスシリコン層を不活性ガス抜き環境に曝露することを更に含む、態様Bに記載の方法。
(態様D)
前記アモルファスシリコン層が、約10オングストロームから約100オングストロームの範囲の厚さを有する、態様Aに記載の方法。
Claims (12)
- アモルファスシリコン層を形成する方法であって、
処理空間内に配置された基板の上に、所定の厚さの酸素含有犠牲誘電体層を堆積させることと、
前記酸素含有犠牲誘電体層を部分的に除去して前記基板の上側表面を露出させることによって、パターニングされたフィーチャを前記基板上に形成することと、
前記パターニングされたフィーチャにプラズマ処理を実施することであって、
前記処理空間に、アンモニア、亜酸化窒素またはそれらの組み合わせを含む処理ガスを流入させることと、
前記基板の前記パターニングされたフィーチャを処理するために、前記処理空間内でプラズマを生成することと
を含む、プラズマ処理を実施することと、
前記パターニングされたフィーチャ上に自己組織化単分子層(self-assembled monolayer:SAM)を形成することであって、前記SAMは、ビス(ジエチルアミノ)シラン(BDEAS)、ヘキサクロロジシラン(HCDS)、(3-アミノプロピル)トリエトキシシラン(APTES)、及びオクタデシルトリクロロシラン(ODTS)を含む群から選択されるSAM前駆体から形成される、SAMを形成することと、
前記SAM上及び前記基板の露出した前記上側表面上に、アモルファスシリコン層を堆積させることと、
前記アモルファスシリコン層から形成された側壁スペーサの中に前記パターニングされたフィーチャが充填されている状態にするために、異方性エッチングプロセスを使用して、前記パターニングされたフィーチャの上側表面及び前記基板の前記上側表面から、前記アモルファスシリコン層を選択的に除去することとを含む、
方法。 - 前記処理ガスがアルゴンをさらに含む、請求項1に記載の方法。
- 前記処理ガスが水素をさらに含む、請求項1に記載の方法。
- 前記パターニングされたフィーチャに前記プラズマ処理を実施することが処理チャンバで実施され、前記パターニングされたフィーチャ上及び前記基板の前記露出した上側表面上に前記アモルファスシリコン層を堆積させることとが、同じ処理チャンバ内で実施される、請求項1に記載の方法。
- 前記酸素含有犠牲誘電体層が酸化ケイ素を含む、請求項1に記載の方法。
- 前記SAM上及び前記基板の前記露出した上側表面上に前記アモルファスシリコン層を堆積させることが、水素を含むアウトガス可能な化学種を有するアモルファスシリコン層を形成するために、前記パターニングされたフィーチャをケイ素前駆体に曝露することを含む、請求項1に記載の方法。
- 前記アモルファスシリコン層から前記アウトガス可能な化学種を除去してガス抜きされたアモルファスシリコン層を形成するために、前記アモルファスシリコン層を不活性ガス抜き環境に曝露することを更に含む、請求項6に記載の方法。
- 前記不活性ガス抜き環境が実質的に不活性ガスから成る、請求項7に記載の方法。
- 前記ケイ素前駆体が、ジシラン、トリシラン、テトラシラン、イソテトラシラン、ネオペンタシラン、シクロペンタシラン、ヘキサシラン、シクロヘキサシラン、及びこれらの組み合わせ、のうちの一又は複数を含む、請求項7に記載の方法。
- 前記ケイ素前駆体がジシランである、請求項9に記載の方法。
- 前記プラズマが、容量結合プラズマ(CCP)、誘導結合プラズマ(ICP)、又はCCPとICPとの組み合わせである、請求項1に記載の方法。
- 前記SAM上及び前記基板の前記露出した上側表面上に堆積されたアモルファスシリコン層が10オングストロームから100オングストロームの範囲の厚さを有する、請求項1に記載の方法。
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