JP7005367B2 - ボロン系膜の成膜方法および成膜装置 - Google Patents
ボロン系膜の成膜方法および成膜装置 Download PDFInfo
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Description
最初に、本発明に至った経緯について説明する。
ボロン系膜はハードマスクとして有望視されており、従来、CVDにより成膜されている。ボロン系膜の中でも、特に、ボロン単独のボロン膜が優れた特性を有することがわかっている。
[成膜装置]
図1は、本発明の第1の実施形態に用いる成膜装置を示す断面図である。本例の成膜装置100は、ボロン膜を成膜するマイクロ波プラズマCVD装置として構成される。
次に、以上のように構成される成膜装置100において実施されるボロン系膜としてのボロン膜の成膜方法について説明する。
膜中にB-H結合を多く含む膜はH終端されているため、膜構造緩和が起こりやすくなるが、B-H結合が減りB-B結合が増え、さらにウエハWに高周波バイアスを印加すること等によって、B-B結合がB-H-B結合に変化することにより、H終端が減少し、膜の構造変化ができなくなり、膜応力が大きくなると考えられる。
[成膜装置]
図11は、本発明の第2の実施形態に用いる成膜装置を示す断面図である。本例の成膜装置200は、ボロン系膜としてボロン膜を成膜する容量結合型平行平板プラズマCVD装置として構成される。
次に、以上のように構成される成膜装置200において実施されるボロン系膜としてのボロン膜の成膜方法について説明する。
以上、本発明の実施の形態について説明したが、本発明は上記実施形態に限定されることなく本発明の思想の範囲内で種々変形可能である。
2,102;載置台
5,105;ヒーター
6,136;ガス供給機構
9,109;バイアス電圧印加用高周波電源
20;マイクロ波プラズマ源
24,124;排気装置
50,150;制御部
68,168;B2H6ガス供給源
69,169;Arガス供給源
70,170;Heガス供給源
100,200;成膜装置
107;プラズマ生成用高周波電源
110;シャワーヘッド
W;半導体ウエハ(被処理基板)
Claims (16)
- ボロン含有ガスを含む処理ガスのプラズマを用いたプラズマCVDにより基板上にボロンを主体とするボロン系膜を成膜し、その際に、プロセスパラメータを調整することにより、成膜するボロン系膜に圧縮応力が付与されるように膜応力を制御し、
調整する前記プロセスパラメータとして、前記処理ガスとして前記ボロン含有ガスとともに供給されるガスのガス種を用い、
前記処理ガス中の前記ボロン含有ガスとともに供給されるガスは希ガスであり、
前記希ガスはHeガスおよび/またはArガスからなり、HeガスとArガスの比率により前記ボロン系膜の圧縮応力を制御することを特徴とするボロン系膜の成膜方法。 - 前記希ガス中のArガスの割合が高くなるほど前記ボロン系膜の圧縮応力が低下し、HeガスとArガスの割合を調整することにより、圧縮応力が120MPa~1800MPaの範囲に制御されることを特徴とする請求項1に記載のボロン系膜の成膜方法。
- 調整する前記プロセスパラメータとして、さらに、前記ボロン系膜を成膜する際に、前記基板に印加する高周波電力によるバイアス電圧を用いることを特徴とする請求項1または請求項2に記載のボロン系膜の成膜方法。
- 前記バイアス電圧を与えるための高周波電力のパワーを上昇させることにより、前記ボロン系膜の圧縮応力が増加し、前記高周波電力のパワーを0~90Wまでの間で調整することにより、前記ボロン系膜の圧縮応力が2GPaまでの所定値に制御されることを特徴とする請求項3に記載のボロン系膜の成膜方法。
- 調整する前記プロセスパラメータとして、さらに、前記ボロン系膜を成膜する際の圧力および/または温度を用いることを特徴とする請求項1から請求項4のいずれか1項に記載のボロン系膜の成膜方法。
- 圧力が低いほど、また温度が高いほど、前記ボロン系膜の圧縮応力が大きくなることを特徴とする請求項5に記載のボロン系膜の成膜方法。
- 圧力が30mTorr(4Pa)~100mTorr(13.3Pa)の範囲、温度が200℃~300℃の範囲で、前記ボロン系膜の圧縮応力が100MPa~1500MPaの範囲に制御されることを特徴とする請求項6に記載のボロン系膜の成膜方法。
- 前記ボロン系膜は、ボロンと不可避的不純物とからなるボロン膜であることを特徴とする請求項1から請求項7のいずれか1項に記載のボロン系膜の成膜方法。
- 前記ボロン含有ガスとしてB2H6ガス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1項に記載のボロン系膜の成膜方法。
- 前記プラズマCVDは、マイクロ波プラズマにより行うことを特徴とする請求項1から請求項9のいずれか1項に記載のボロン系膜の成膜方法。
- 前記ボロン系膜の成膜は、圧力:5mTorr(0.67Pa)~250mTorr(33.3Pa)、温度:500℃以下で行うことを特徴とする請求項1から請求項10のいずれか1項に記載のボロン系膜の成膜方法。
- 基板上にボロンを主体とするボロン系膜を成膜する成膜装置であって、
基板を収容するチャンバと、
前記チャンバ内で基板を支持する載置台と、
前記チャンバ内にボロン含有ガスと、希ガスであるHeガスおよび/またはArガスとを供給するガス供給機構と、
前記チャンバ内を排気する排気装置と、
前記チャンバ内にプラズマを生成するプラズマ生成手段と、
前記基板上に成膜するボロン系膜に圧縮応力が付与されるように膜応力を制御する制御部と
を有し、
前記制御部は、HeガスとArガスの比率を調整することにより前記ボロン系膜の圧縮応力を制御することを特徴とする成膜装置。 - 前記成膜装置は、前記載置台に高周波電力を印加し、前記載置台上の前記基板にバイアス電圧を印加するバイアス電圧印加用高周波電源を有し、
前記制御部は、さらに、前記バイアス電圧印加用高周波電源のパワーを調整して前記ボロン系膜の圧縮応力を制御することを特徴とする請求項12に記載の成膜装置。 - 前記制御部は、前記バイアス電圧印加用高周波電源のパワーを0~90Wまでの間で調整することにより、前記ボロン系膜の圧縮応力を2GPaまでの所定値に制御することを特徴とする請求項13に記載の成膜装置。
- 前記プラズマ生成手段は、マイクロ波によりプラズマを生成することを特徴とする請求項12から請求項14のいずれか1項に記載の成膜装置。
- 前記ガス供給機構は、前記ボロン含有ガスとしてB2H6ガスを供給することを特徴とする請求項12から請求項15のいずれか1項に記載の成膜装置。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018018018A JP7005367B2 (ja) | 2018-02-05 | 2018-02-05 | ボロン系膜の成膜方法および成膜装置 |
| KR1020190011679A KR102157433B1 (ko) | 2018-02-05 | 2019-01-30 | 보론계 막의 성막 방법 및 성막 장치 |
| US16/263,236 US11145522B2 (en) | 2018-02-05 | 2019-01-31 | Method of forming boron-based film, and film forming apparatus |
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| JP2009505402A (ja) | 2005-08-08 | 2009-02-05 | アプライド マテリアルズ インコーポレイテッド | 低温で堆積された炭素含有ハードマスクを使用する半導体基板プロセス |
| JP2013533376A (ja) | 2010-05-24 | 2013-08-22 | アプライド マテリアルズ インコーポレイテッド | リソグラフィマスクの用途のためのホウ素リッチ膜のエンジニアリング |
| JP2013540359A (ja) | 2010-10-05 | 2013-10-31 | アプライド マテリアルズ インコーポレイテッド | 超高選択性ドープアモルファスカーボン剥離性ハードマスクの開発および集積 |
| US20170103893A1 (en) | 2015-10-09 | 2017-04-13 | Applied Materials, Inc. | Ultra-high modulus and etch selectivity boron-carbon hardmask films |
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| JPH05117086A (ja) * | 1991-10-28 | 1993-05-14 | Sumitomo Electric Ind Ltd | ダイヤモンド薄膜の製造方法およびダイヤモンド基板 |
| JP3226816B2 (ja) * | 1996-12-25 | 2001-11-05 | キヤノン販売株式会社 | 層間絶縁膜の形成方法、半導体装置及びその製造方法 |
| DE19826259A1 (de) * | 1997-06-16 | 1998-12-17 | Bosch Gmbh Robert | Verfahren und Einrichtung zum Vakuumbeschichten eines Substrates |
| US6383465B1 (en) * | 1999-12-27 | 2002-05-07 | National Institute For Research In Inorganic Materials | Cubic boron nitride and its gas phase synthesis method |
| CN101743631B (zh) * | 2007-07-13 | 2012-12-26 | 应用材料公司 | 硼衍生的材料的沉积方法 |
| US8007910B2 (en) * | 2007-07-19 | 2011-08-30 | City University Of Hong Kong | Ultrahard multilayer coating comprising nanocrystalline diamond and nanocrystalline cubic boron nitride |
| US8247332B2 (en) * | 2009-12-04 | 2012-08-21 | Novellus Systems, Inc. | Hardmask materials |
| US10388524B2 (en) * | 2016-12-15 | 2019-08-20 | Tokyo Electron Limited | Film forming method, boron film, and film forming apparatus |
| JP7049883B2 (ja) * | 2018-03-28 | 2022-04-07 | 東京エレクトロン株式会社 | ボロン系膜の成膜方法および成膜装置 |
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| JP2009505402A (ja) | 2005-08-08 | 2009-02-05 | アプライド マテリアルズ インコーポレイテッド | 低温で堆積された炭素含有ハードマスクを使用する半導体基板プロセス |
| JP2013533376A (ja) | 2010-05-24 | 2013-08-22 | アプライド マテリアルズ インコーポレイテッド | リソグラフィマスクの用途のためのホウ素リッチ膜のエンジニアリング |
| JP2013540359A (ja) | 2010-10-05 | 2013-10-31 | アプライド マテリアルズ インコーポレイテッド | 超高選択性ドープアモルファスカーボン剥離性ハードマスクの開発および集積 |
| US20170103893A1 (en) | 2015-10-09 | 2017-04-13 | Applied Materials, Inc. | Ultra-high modulus and etch selectivity boron-carbon hardmask films |
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| JP2019135739A (ja) | 2019-08-15 |
| KR102157433B1 (ko) | 2020-09-17 |
| US11145522B2 (en) | 2021-10-12 |
| KR20190095130A (ko) | 2019-08-14 |
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