JP6861479B2 - プラズマ成膜方法およびプラズマ成膜装置 - Google Patents
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Description
を提供する。
図1は本発明の一実施形態に係るプラズマ成膜方法が適用可能なプラズマ成膜装置の一例を示す断面図である。図1のプラズマ処理装置は、RLSA(登録商標)マイクロ波プラズマ成膜装置として構成されており、被処理体である半導体ウエハ(以下単に「ウエハ」と記す)にプラズマCVDにより窒化珪素(SiN)膜を成膜するようになっている。
次に、このように構成されるプラズマ成膜装置100を用いたプラズマ成膜方法の一実施形態について図2のフローチャートを参照して説明する。
マイクロ波発生装置39からの所定のパワーのマイクロ波を、マッチング回路38を経て導波管37に導く。導波管37に導かれたマイクロ波は、矩形導波管37bをTEモードで伝播される。TEモードのマイクロ波はモード変換器40でTEMモードにモード変換され、TEMモードのマイクロ波が同軸導波管37aをTEMモードで伝播される。そして、TEMモードのマイクロ波は、遅波材33、平面アンテナ31のスロット32、およびマイクロ波透過板28を透過し、チャンバー1内に放射される。
処理温度(サセプタ2表面の温度):250〜550℃
処理圧力:6.5〜100Pa(50〜750mTorr)
Heガス流量:100〜400mL/min(sccm)
SiH4ガス流量:10〜200mL/min(sccm)
N2ガス流量:10〜200mL/min(sccm)
マイクロ波パワー密度:0.01〜0.04W/cm2
次に、実験例について説明する。
ここでは、図1に示すプラズマ成膜装置を用いてプラズマCVDによりSiN膜を成膜するにあたり、プラズマ生成ガスとしてHeガスを添加しない場合とHeガスを添加した場合について膜厚均一性を比較した。
SiH4ガス流量:90sccm
N2ガス流量:70sccm
マイクロ波パワー密度:2.78W/cm2
処理時間:80sec
SiH4ガス流量:10〜200sccm
N2ガス流量:5〜200sccm
マイクロ波パワー密度:2.43〜3.34W/cm2
処理時間:10〜200sec
以上、添付図面を参照して本発明の実施形態について説明したが、本発明は、上記の実施の形態に限定されることなく、本発明の思想の範囲内において種々変形可能である。
2;サセプタ
5;ヒーター
15;ガス導入部
16;ガス供給機構
24;排気機構
28;マイクロ波透過板
31;平面アンテナ
32;スロット
33;遅波材
37;導波管
38;マッチング回路
39;マイクロ波発生装置
40;モード変換器
50;制御部
100;プラズマ成膜装置
W;半導体ウエハ(被処理体)
Claims (8)
- チャンバー内に被処理体を配置し、前記チャンバー内に成膜ガスを供給するとともに、前記チャンバー内にプラズマを生成させ、前記プラズマにより前記成膜ガスを励起させて被処理体上に所定の膜を成膜するプラズマ成膜方法であって、
前記成膜ガスとして、シリコン原料ガスおよび窒素含有ガスを用い、前記プラズマはマイクロ波プラズマであり、前記チャンバー内に、前記成膜ガスとともにプラズマ生成ガスとしてヘリウムガスを、前記成膜ガスと前記ヘリウムガスとの分圧比率が0.15〜2.5の範囲となるように供給し、前記チャンバー内に前記マイクロ波プラズマとしてヘリウムガスを含むプラズマを生成させ、これにより、プラズマを安定化しつつ、前記所定の膜として、所望の膜厚均一性および膜質均一性を有する窒化珪素膜を成膜することを特徴とするプラズマ成膜方法。 - 前記マイクロ波プラズマは、RLSA(登録商標)マイクロ波プラズマ処理装置により生成されたものであることを特徴とする請求項1に記載のプラズマ成膜方法。
- 前記被処理体の処理温度は、250〜550℃の範囲であることを特徴とする請求項1または請求項2に記載のプラズマ成膜方法。
- 前記チャンバー内の処理圧力は、6.5〜100Paの範囲であることを特徴とする請求項1から請求項3のいずれか1項に記載のプラズマ成膜方法。
- 被処理体が収容されるチャンバーと、
前記チャンバー内で被処理体が保持される基板保持部材と、
前記チャンバー内にガスを供給するガス供給機構と、
前記チャンバー内を排気する排気機構と、
前記チャンバー内にマイクロ波プラズマを生成させるプラズマ生成手段と
を有し、
前記ガス供給機構は、前記被処理体上にシリコン原料ガスおよび窒素含有ガスを含む成膜ガスと、プラズマ生成ガスとしてのヘリウムガスとを、前記成膜ガスと前記ヘリウムガスとの分圧比率が0.15〜2.5の範囲となるように前記チャンバー内に供給し、
前記プラズマ生成手段により、前記チャンバー内に前記マイクロ波プラズマとしてヘリウムガスを含むプラズマを生成させ、該プラズマにより、プラズマを安定化しつつ、前記成膜ガスを励起させて前記被処理体上に所望の膜厚均一性および膜質均一性を有する窒化珪素膜を成膜することを特徴とするプラズマ成膜装置。 - 前記プラズマ生成手段は、マイクロ波を発生させるマイクロ波発生装置と、マイクロ波を放射するスロットを有する平面アンテナと、前記チャンバーの天壁を構成する誘電体からなるマイクロ波透過板とを有し、前記平面アンテナの前記スロットおよび前記マイクロ波透過板を介してマイクロ波を前記チャンバー内に放射させ、前記チャンバー内にマイクロ波プラズマを供給し、前記チャンバー内にマイクロ波プラズマを生成させることを特徴とする請求項5に記載のプラズマ成膜装置。
- 前記被処理体の処理温度を制御する手段を有し、前記被処理体の温度が250〜550℃の範囲に制御されることを特徴とする請求項5または請求項6に記載のプラズマ成膜装置。
- 前記チャンバー内の処理圧力を制御する手段を有し、前記チャンバー内の処理圧力が6.5〜100Paの範囲に制御されることを特徴とする請求項5から請求項7のいずれか1項に記載のプラズマ成膜装置。
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| JP2016125087A JP6861479B2 (ja) | 2016-06-24 | 2016-06-24 | プラズマ成膜方法およびプラズマ成膜装置 |
| KR1020170078124A KR102047160B1 (ko) | 2016-06-24 | 2017-06-20 | 플라즈마 성막 방법 및 플라즈마 성막 장치 |
| US15/627,583 US10190217B2 (en) | 2016-06-24 | 2017-06-20 | Plasma film-forming method and plasma film-forming apparatus |
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| JP7489905B2 (ja) * | 2020-11-30 | 2024-05-24 | 東京エレクトロン株式会社 | チャンバーコンディションの診断方法及び基板処理装置 |
| JP2024020777A (ja) | 2022-08-02 | 2024-02-15 | 東京エレクトロン株式会社 | SiN膜の形成方法及びプラズマ処理装置 |
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| US5976623A (en) * | 1996-12-03 | 1999-11-02 | Lucent Technologies Inc. | Process for making composite films |
| US6287643B1 (en) * | 1999-09-30 | 2001-09-11 | Novellus Systems, Inc. | Apparatus and method for injecting and modifying gas concentration of a meta-stable or atomic species in a downstream plasma reactor |
| US20030134499A1 (en) * | 2002-01-15 | 2003-07-17 | International Business Machines Corporation | Bilayer HDP CVD / PE CVD cap in advanced BEOL interconnect structures and method thereof |
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| JP2009246129A (ja) | 2008-03-31 | 2009-10-22 | Tokyo Electron Ltd | プラズマcvd窒化珪素膜の成膜方法及び半導体集積回路装置の製造方法 |
| JP2011077323A (ja) * | 2009-09-30 | 2011-04-14 | Tokyo Electron Ltd | 窒化珪素膜の成膜方法および半導体メモリ装置の製造方法 |
| JP2012216667A (ja) * | 2011-03-31 | 2012-11-08 | Tokyo Electron Ltd | プラズマ処理方法 |
| JP2013033828A (ja) * | 2011-08-01 | 2013-02-14 | Tokyo Electron Ltd | 成膜方法 |
| US9117668B2 (en) | 2012-05-23 | 2015-08-25 | Novellus Systems, Inc. | PECVD deposition of smooth silicon films |
| JP2013249530A (ja) * | 2012-06-04 | 2013-12-12 | National Institute Of Advanced Industrial Science & Technology | グラフェンの製造方法及びグラフェン |
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