JP7511040B2 - 酸素含有薄膜の制御された形成のためのプラズマ増強堆積プロセス - Google Patents
酸素含有薄膜の制御された形成のためのプラズマ増強堆積プロセス Download PDFInfo
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Description
本出願は、2017年5月5日に出願された米国仮特許出願第62/502,118号の優先権を主張する。
上記のように、および以下でより詳細に論じるように、いくつかの実施形態では、SiOC薄膜を、プラズマ増強原子堆積層(PEALD)プロセスによって反応空間内の基材上に堆積させることができる。いくつかの実施形態によれば、SiOC薄膜は、三次元形体、例えばFinFET用途を有する基材上にPEALDプロセスを用いて堆積される。いくつかの実施形態では、SiOC薄膜が三次元形体上に堆積される場合、特性、例えば形体の異なる表面上の堆積膜のステップカバレッジおよびWERRは、所定の範囲またはプラズマパワーから好適なプラズマパワーを選択することによって制御されることができる。いくつかの実施形態では、堆積膜の特性、例えば厚さまたはWERは、異なる面、例えば形体の垂直面および水平面で異なるように制御されることができる。いくつかの実施形態では、本明細書に記載のPEALDプロセスは、様々な用途に用いられることができる。例えば、本明細書に記載のPEALDプロセスは、ハードマスク層、犠牲層、保護層、またはlow-kスペーサーの形成に使用されてもよい。本明細書に記載のPEALDプロセスは、例えばメモリーデバイス用途で用いられてもよい。
本開示のPEALDプロセスにおいて、多くの異なる好適なSi前駆体を使用することができる。いくつかの実施形態では、好適なSi前駆体はシランを含んでもよい。
上記のように、本開示によるSiOCを堆積するための第二の反応物質は、酸素を含まないプラズマを含んでもよい。プラズマは、酸素を含まないガスにプラズマパワーを印加することにより生成されてもよい。いくつかの実施形態では、第二の反応物質は、反応種を含むことができる水素前駆体を含むことができる。いくつかの実施形態では、反応種は、ラジカル、プラズマ、および/または励起原子または種を含むが、これらに限定されない。このような反応種は、例えば、プラズマ放電、ホットワイヤ、または他の好適な方法によって生成されることができる。いくつかの実施形態では、反応種は、反応チャンバーから離れた場所で、例えば反応チャンバーの上流で生成されてもよい(「リモートプラズマ」)。いくつかの実施形態では、反応種は、反応チャンバー内で、基材のすぐ近傍で、または基材の直上で生成されることができる(「直接プラズマ」)。
本明細書で考察したいくつかの実施形態に従って堆積されるSiOC薄膜は、約3at%未満、約1at%未満、約0.5at%未満、または約0.1at%未満の不純物レベルまたは濃度を達成することができる。いくつかの薄膜では、水素を除く総不純物レベルは、約5at%未満、約2at%未満、約1at%未満、または約0.2at%未満であってもよい。いくつかの薄膜では、水素レベルは、約30at%未満、約20at%未満、約15at%未満、または約10at%未満であってもよい。本明細書で使用される場合、不純物は、Si、O、および/またはC以外の任意の要素とみなされてもよい。いくつかの実施形態では、薄膜はアルゴンを含まない。
いくつかの実施形態では、SiOC以外の材料を含む薄膜の形成は、本明細書に記載のプロセスによって堆積および/または制御されることができる。例えば、いくつかの実施形態では、金属酸化物薄膜および金属酸化物膜の形成は、酸素プラズマも励起酸素種も含まないPEALDプロセスにより、本明細書に記載のように制御されることができる。これらの実施形態では、本明細書に記載のプロセスのシリコン前駆体の代わりに異なる金属前駆体が用いられる。いくつかの実施形態では、酸化チタン、酸化ニオブ、酸化タンタル、酸化タングステン、TiO(CN)および/または酸化アルミニウム薄膜の形成は、本明細書に記載のPEALDプロセスによって制御されることができる。いくつかの実施形態では、酸化チタン、TiO(CN)、酸化ニオブ、酸化タンタル、酸化タングステン、および/または酸化アルミニウムの薄膜は、本明細書に記載のPEALDプロセスによって堆積されることができる。
Claims (16)
- 基材の三次元形体上のシリコン酸炭化物(SiOC)薄膜のステップカバレッジを制御する方法であって、前記方法は、プラズマ増強原子層堆積(PEALD)プロセスにより前記基材の前記三次元形体上に前記SiOC薄膜を堆積させることを含み、前記プロセスは:
前記基材を、酸素を含む気相シリコン前駆体に接触させることと;
前記基材を、酸素を含まないガス中で100W~650Wのプラズマパワーで生成されるプラズマからの反応種を含む第二の反応物質と接触させることと;を含む少なくとも一つの堆積サイクルを含み、
SiOC薄膜は、前記三次元形体上で20%以上のステップカバレッジを有し、
前記三次元形体は、1~10のアスペクト比を有し、
前記堆積させたSiOC膜を、H 2 、N 2 、O 2 、N 2 O、NO、NO 2 、NH 3 、CO、CO 2 、またはH 2 Oを含むガス中で形成されるプラズマによって生成される少なくとも一つの反応種に曝すことをさらに含み、
前記堆積させたSiOC膜を前記少なくとも一つの反応種に曝すことにより、前記三次元形体の水平面上の前記SiOC膜の厚さを低減させ、前記三次元形体の垂直面上に堆積される前記SiOC膜の前記厚さを増加させる、方法。 - 前記基材を前記気相シリコン前駆体と接触させた後、前記基材を前記第二の反応物質と接触させる前に、過剰な気相シリコン前駆体を除去することをさらに含む、請求項1に記載の方法。
- 前記堆積サイクルが繰り返されて、所望の厚さのSiOC膜を形成する、請求項1に記載の方法。
- 前記気相シリコン前駆体は酸素を含み、前記堆積サイクルで用いられる他の反応物質は酸素を含まない、請求項1に記載の方法。
- 前記シリコン前駆体は少なくとも一つのアルコキシ基を含む、請求項1に記載の方法。
- 前記シリコン前駆体は、3-メトキシプロピルトリメトキシシラン(MPTMS)を含む、請求項5に記載の方法。
- 前記第二の反応物質は水素原子、水素ラジカル、または水素イオンを含む、請求項1に記載の方法。
- 前記ステップカバレッジは、20%~1000%である、請求項1に記載の方法。
- 前記三次元形体の垂直面上に形成される前記SiOC膜のウェットエッチング速度の、前記三次元形体の水平面上に形成される前記SiOC膜のウェットエッチング速度に対する比は、0.2~15である、請求項1に記載の方法。
- 前記堆積させたSiOC膜を前記少なくとも一つの反応種に曝すことにより、前記三次元形体の垂直面上の前記SiOC膜のウェットエッチング速度(WER)を低減させる、請求項1に記載の方法。
- 前記堆積させたSiOCをエッチングすることをさらに含む、請求項1に記載の方法。
- 三次元形体の第二の垂直面に対して基材上の前記三次元形体の第一の水平面上にSiOCを選択的に形成するプロセスであって、前記プロセスは:
前記基材を、酸素を含むシリコン前駆体、および水素を含み、酸素を含まないガス中で形成されるプラズマを含む第二の反応物質と、交互に順次接触させることを含む、プラズマ増強原子層堆積(PEALD)プロセスによって前記三次元形体の水平面および垂直面上にSiOCを堆積させることであって、前記水平面上に堆積される前記SiOCは、前記垂直表面上に堆積される前記SiOCのエッチング速度よりも遅いエッチング速度を有する、堆積させることと;
前記堆積させたSiOCをエッチングすること;を含み、
前記堆積させたSiOCをエッチングすることは、前記堆積させたSiOCを所望の期間、0.5wt%の希釈HFに曝すことを含む、プロセス。 - 前記シリコン前駆体はシリコンアルコキシドを含む、請求項12に記載のプロセス。
- 前記プラズマはH2およびArを含むガス中で形成される、請求項12に記載のプロセス。
- 前記堆積させたSiOCをエッチングすることは、前記堆積させたSiOCを所望の期間、0.5wt%の希釈HFに曝すことを含む、請求項12に記載のプロセス。
- 前記堆積させたSiOCをエッチングすることは、前記堆積させたSiOCをラジカル、イオン、プラズマ、またはそれらの組み合わせに曝すことを含む、請求項12に記載のプロセス。
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| CN110546302B (zh) | 2017-05-05 | 2022-05-27 | Asm Ip 控股有限公司 | 用于受控形成含氧薄膜的等离子体增强沉积方法 |
| US11501965B2 (en) | 2017-05-05 | 2022-11-15 | Asm Ip Holding B.V. | Plasma enhanced deposition processes for controlled formation of metal oxide thin films |
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| KR102805403B1 (ko) | 2025-05-13 |
| JP7249952B2 (ja) | 2023-03-31 |
| TW202235660A (zh) | 2022-09-16 |
| US11776807B2 (en) | 2023-10-03 |
| JP2020519007A (ja) | 2020-06-25 |
| US20200395211A1 (en) | 2020-12-17 |
| TWI835151B (zh) | 2024-03-11 |
| TWI769248B (zh) | 2022-07-01 |
| WO2018204709A1 (en) | 2018-11-08 |
| KR102627238B1 (ko) | 2024-01-19 |
| CN114875388A (zh) | 2022-08-09 |
| US20220044931A1 (en) | 2022-02-10 |
| JP2023075174A (ja) | 2023-05-30 |
| CN110546302A (zh) | 2019-12-06 |
| CN110546302B (zh) | 2022-05-27 |
| TW201843734A (zh) | 2018-12-16 |
| KR20240010760A (ko) | 2024-01-24 |
| KR20200004317A (ko) | 2020-01-13 |
| US11158500B2 (en) | 2021-10-26 |
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