JP5026267B2 - 低温プラズマ接合のためのシステムおよび方法 - Google Patents
低温プラズマ接合のためのシステムおよび方法 Download PDFInfo
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Description
図1Aおよび図1Bに、1つまたは複数の接合される界面を含む、複数の例示的なMEMS構造を示す。図1Aに示すように、光学MEMS構造(100)は、コンタクトパッド(125)のような複数の素子を支持するベース基板(145)と、電極(140)と、電極に隣接して配置されている画素プレート(135)と、ベース基板上に形成されているテトラエチルオルソシリケート酸化シリコン(TEOS)部材(120)とを備えていてよい。接合材料(115)およびガラス蓋(110)がTEOS部材(120)に接合されている。さらに、ガラス蓋(110)上に反射防止コーティング(105)を形成して、MEMSデバイス(100)の光学特性を高めることができる。また図1Aには、水分が、画素プレート(135)のようなMEMS構造(100)の内部構成要素に接触して悪影響を及ぼすのを防ぐために、TEOS部材(120)内に配置される誘電体プラグ(130)も示す。図1Aに示す、MEMS構造(100)の複数の構成要素が互いに接合され、これにより、本発明のシステムおよび方法から利益を享受できる。
図2は、1つの例示的な実施形態による、プラズマ活性化および水和で低温接合を実施するために用いることができるプラズマ処理システム(200)を示す簡単なブロック図である。図2に示すように、プラズマ処理システム(200)は一般的に、ガス源(220)および水蒸気源(230)に接続されている試料ホルダ(210)を有する。さらに、真空ポンプ(240)が、試料ホルダ(210)に流体連通している。さらに、プラズマ処理システム(200)は一般に、整合回路網(250)を介して試料ホルダ(210)に接続される無線周波数(RF)発生器(260)を備えている。さらに、上記の発生器(260)に加えて、第2のRF発生器(図示せず)を用いて、上流に高密度プラズマを生成することもできる。この例示的な実施形態によれば、ガスプラズマまたは水プラズマおよび基板バイアスは、個別に制御することができる。さらに、本発明のプラズマ処理システム(200)の個々の構成要素のさらなる詳細については、後述の通りである。
1つの例示的な実施形態によれば、図2に示すプラズマ処理システム(200)を用いて、O2プラズマまたはN2プラズマとともに水プラズマで接合界面を処理して、プラズマ強化接合のために接合界面を水和する。水プラズマ処理は、N2またはO2プラズマ活性化工程中に、またはその後に実行することができる。これにより、従来用いられてきたポストプラズマ湿式処理プロセスを用いずに、十分な接合表面エネルギーが維持される。それゆえ、本発明のシステムおよび方法は、MEMSへの応用および乾燥剤を含む応用に非常に適している。
Si−OH..HO−Si→ Si−O−Si+(H2O)n 式1
水分子(510)が接着界面(500)から拡散するとき、基板表面(540、550)間でシラノール基が多数のシロキサン結合(520)に変化し、それにより、第1の表面と第2の表面との間の間隙(G)が小さくなる。図5Cに示すように、水分子(510、図5B)の実質的に全てが接合界面(500、図5A)から追い出されると、多数のシロキサン結合(520)が接合界面に沿って形成される。したがって、2つの基板(440、450;図4)間に高い表面エネルギーを低温で達成することができる。1つの例示的な実施形態では、親水性Si/SiO2界面の表面エネルギーは、200℃において2J/m2以上に達する。
表面における濡れ性および高いシラノール基密度が良好であることの指標を評価するための一般的な方法は接触角である。1つの例示的な実施形態によれば、シリコン(Si)の切取試片を、N2プラズマ活性化および水プラズマ処理の両処理後に、接触角により表面濡れ性を試験した。水プラズマにより、Si切取試片の濡れ性は大幅に改善された。43°の接触角を有する処理されなかったSi切取試片とは対照的に、240秒間水プラズマ処理された試料は、約1〜5°まで接触角が減少し、これは、水プラズマが、N2プラズマ処理されたSi表面を親水化するのに極めて有効に作用し、これにより、その場所のシラノール基密度を大幅に高めることを示す。
Claims (10)
- Si又はSiO 2 の複数の基板(145、440、450)を接合する方法であって、
前記複数の基板(145、440、450)の各々の表面(540、550)を平滑化し、
前記平滑化の後、前記複数の基板(145、440、450)上でガスプラズマ処理を実施し、
前記ガスプラズマ処理の後又はそれと同時に、前記複数の基板(145、440、450)上で水プラズマ処理を実施し、当該水プラズマ処理が、前記複数の基板(145、440、450)の各々の表面(540、550)を水和するように構成されており、これにより、シラノール基が形成され、前記複数の基板(145、440、450)の各々の表面(540、550)が水和され、
前記水プラズマ処理の後、前記複数の基板(145、440、450)を物理的に接合させ、
前記結合させた複数の基板(145、440、450)をアニールし、それにより、前記基板の表面間にシロキサン結合を形成する
ことを含む、方法。 - 前記ガスプラズマ処理が、N2、O2、アルゴンまたは空気のうちの1つを含む、請求項1に記載の方法。
- 前記複数の基板(145、440、450)上で水プラズマ処理を実施することが、
基板ハウジング内に所定量の水蒸気を導入すること、および
前記基板ハウジングに、水プラズマを生成しかつ前記複数の基板(145、440、450)の各々の表面(540、550)を水和するに十分な無線周波数電力を導入すること
を含む、請求項1に記載の方法。 - 前記平滑化によって、前記表面(540、550)が、2μm×2μmの面積にわたって、20Årms未満の平滑度を有する、請求項1に記載の方法。
- 前記水プラズマ処理が、前記ガスプラズマ処理と同時に実施される、請求項1に記載の方法。
- 前記水プラズマ処理が、前記ガスプラズマ処理の後に実施される、請求項1に記載の方法。
- 前記ガスプラズマ処理が、前記複数の基板(145、440、450)の表面(540、550)上の界面化学種の密度を高めるように構成されている、請求項1に記載の方法。
- 前記複数の基板(145、440、450)が乾燥剤を含む、請求項1に記載の方法。
- 前記複数の基板(145、440、450)が、微小電気機械システムを含む、請求項1に記載の方法。
- 前記複数の基板(145、440、450)の各々の表面(540、550)を平滑化することが、前記複数の基板(145、440、450)上で化学機械平坦化操作を実施することを含む、請求項1に記載の方法。
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US10/917,807 | 2004-08-13 | ||
US10/917,807 US7261793B2 (en) | 2004-08-13 | 2004-08-13 | System and method for low temperature plasma-enhanced bonding |
PCT/US2005/027139 WO2006020439A2 (en) | 2004-08-13 | 2005-07-29 | A system and method for low temperature plasma-enhanced bonding |
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JP2008513975A JP2008513975A (ja) | 2008-05-01 |
JP5026267B2 true JP5026267B2 (ja) | 2012-09-12 |
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US (3) | US7261793B2 (ja) |
EP (1) | EP1787322B1 (ja) |
JP (1) | JP5026267B2 (ja) |
TW (1) | TWI372723B (ja) |
WO (1) | WO2006020439A2 (ja) |
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US20060032582A1 (en) | 2006-02-16 |
EP1787322A2 (en) | 2007-05-23 |
US7261793B2 (en) | 2007-08-28 |
WO2006020439A2 (en) | 2006-02-23 |
TWI372723B (en) | 2012-09-21 |
TW200607751A (en) | 2006-03-01 |
WO2006020439A3 (en) | 2006-08-31 |
US20070272349A1 (en) | 2007-11-29 |
JP2008513975A (ja) | 2008-05-01 |
US20060033188A1 (en) | 2006-02-16 |
EP1787322B1 (en) | 2011-06-29 |
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