JP2009503852A - ドライエッチプロセスを使用してアンダーバンプメタル層を効率的にパターニングする技術 - Google Patents
ドライエッチプロセスを使用してアンダーバンプメタル層を効率的にパターニングする技術 Download PDFInfo
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- JP2009503852A JP2009503852A JP2008523978A JP2008523978A JP2009503852A JP 2009503852 A JP2009503852 A JP 2009503852A JP 2008523978 A JP2008523978 A JP 2008523978A JP 2008523978 A JP2008523978 A JP 2008523978A JP 2009503852 A JP2009503852 A JP 2009503852A
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Abstract
Description
さらに、プラズマベースのドライエッチプロセスが与える利点により、バンプのパターン密度に対するパターニングプロセスの依存度が大幅に低減することから、独創的な技術により、コンタクト層を設計するためのフレキシビリティ度が増す。その結果、本発明は、生産コストを減らす、および/または生産歩留まりを増加する、および/またはデバイス性能を高める可能性を与える。
本発明は、様々な改良を行い、また、他の形態で実施することができるが、ここに説明されている特定の実施形態は、例示として示したものであり、以下にその詳細を記載する。しかし当然のことながら、ここに示した特定の実施形態は、本発明を開示されている特定の形態に限定するものではなく、むしろ本発明は添付の請求項によって規定されている発明の範疇に属するすべての改良、均等物、および変形例をカバーするものである。
例示的実施形態では、この層は、チタンタングステン層として供給され得る。チタンタングステン層は、非常に複雑なウェット化学エッチプロセスを必要とし、これにより、生産コストが増加し、従来のウェット化学エッチプロセスにより分離したチタンタングステンリングなどのエッチ残留物により、歩留まりが抑えられる。このような残留物により、はんだボールの高さの均一性が低下するおそれがある。最後のアンダーバンプメタル層のプラズマベースパターニングプロセスにより、パターン密度とバンプ寸法への依存度が非常に低下する。これにより、はんだバンプの電気、熱および化学的特徴などの、デバイスによって異なる要件をさらに実効的に検討することができるよう、設計上のフレキシビリティを強化することが可能となる。他方、プラズマベースエッチプロセスの、領域に依存した効果、たとえば、露出したチタン/タングステン材料の量や、最後のアンダーバンプメタル層の任意の他の材料などは、これに対応してプラズマベースのエッチレシピを適応させることで、たとえば、これに対応して全体の処理時間を適応させることで、容易に考慮することができる。ここでは、プラズマベースのパターニングプロセスを確実に終了するために、非常に実効的な終点検出プロシージャを用いることができる。したがって、非常に複雑なウェット化学エッチプロセスには従来必要であった化学物質に関しては、実質的にコストを抑えることができ、さらに、従来のエッチプロセスの制御および監視に通常伴う分析プロシージャにおいての試み(effort)を減らすことができる。さらに、一般的には、プラズマベースのパターニングプロセスを用いることで、処理時間を減らすことができる。さらに、はんだバンプは一般に、従来技術ではバンプ構造とバンプサイズに依存し得るエッチ速度の変動が減ることで、さらに精密に形成することができる。これにより、最終的に、はんだボールをダイに対してさらにコントロールして結合することができる。さらに、プラズマベースのパターニングプロセスは実質的にはバンプ寸法、配列、およびバンプピッチとは無関係であるので、デバイスのさらなるスケーリングを実現することができる。バンプ寸法に加えてバンプピッチは、将来のデバイス世代にも適切となるように縮小することができる。
Claims (11)
- アンダーバンプメタル積層(105)上に形成された複数のバンプ(106)の存在下で、電気化学エッチプロセス(107)により前記アンダーバンプメタル積層(105)の第1層(105A)をパターニングするステップと、
ドライエッチプロセス(111)により前記アンダーバンプメタル積層(105)の第2層(105B)をパターニングするステップとを含む方法。 - 前記第2層(105B)をパターニングする前に前記第2層(105B)を洗浄するステップをさらに含む、請求項1記載の方法。
- 前記第2層(105B)を洗浄するステップ(110)は、前記第2層(105B)から粒子(109)を除去するステップを含む、請求項2記載の方法。
- 前記第2層(105B)の洗浄ステップ(110)は、少なくとも、前記電気化学エッチプロセス(107)の間に実行される第1洗浄プロセス(110)と、前記電気化学エッチプロセス(107)後に実行される第2ウェット洗浄プロセス(110A)とを含む、請求項3記載の方法。
- 前記第2層(105B)のパターニングステップは、化学反応性構成要素と、前記第2層を照射する物理的構成要素とを含むプラズマ環境を構築するステップを含む、請求項1記載の方法。
- 前記第2層(105B)をパターニングした後、前記アンダーバンプメタル積層(105)下方の保護層(103)から炭素残留物(112)を除去するために、プラズマ洗浄プロセス(113)を実行するステップをさらに含む、請求項1記載の方法。
- 前記プラズマ洗浄(113)の終点を光学的に検出するステップをさらに含む、請求項6記載の方法。
- 前記先行するドライエッチプロセス(111)の副産物を除去するために、ウェット化学洗浄プロセス(114)を実行するステップをさらに含む、請求項1記載の方法。
- 前記第2層(105B)をパターニングするステップはさらに、前記バンプ(106)をエッチマスクとして使用しながら、前記露出した第2層(105B)をドライエッチする(111)ステップをさらに含む、請求項1記載の方法。
- 前記ドライエッチプロセス(111)を光学的に検出するステップをさらに含む、請求項1記載の方法。
- 下方の保護層(103)にエッチングによって形成される少なくとも1つの揮発性化合物の適切なモニタ波長を判断するステップをさらに含む、請求項10記載の方法。
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DE102005035772A DE102005035772A1 (de) | 2005-07-29 | 2005-07-29 | Technik zum effizienten Strukturieren einer Höckerunterseitenmetallisierungsschicht unter Anwendung eines Trockenätzprozesses |
US11/382,135 US7585759B2 (en) | 2005-07-29 | 2006-05-08 | Technique for efficiently patterning an underbump metallization layer using a dry etch process |
PCT/US2006/028194 WO2007015938A2 (en) | 2005-07-29 | 2006-07-20 | Method for patterning an underbump metallizattion layer using a dry etc process |
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JP2012114148A (ja) * | 2010-11-22 | 2012-06-14 | Fujitsu Semiconductor Ltd | 半導体装置の製造方法 |
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TW200735198A (en) * | 2006-03-01 | 2007-09-16 | Advanced Semiconductor Eng | The method for removing the residual flux |
JP2007317979A (ja) * | 2006-05-29 | 2007-12-06 | Toshiba Corp | 半導体装置の製造方法 |
JP2008262953A (ja) * | 2007-04-10 | 2008-10-30 | Sharp Corp | 半導体装置の製造方法 |
TWI446843B (zh) * | 2007-12-11 | 2014-07-21 | Unimicron Technology Corp | 線路板及其製程 |
US20090200675A1 (en) * | 2008-02-11 | 2009-08-13 | Thomas Goebel | Passivated Copper Chip Pads |
US9773744B2 (en) * | 2011-07-12 | 2017-09-26 | Globalfoundries Inc. | Solder bump cleaning before reflow |
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EP3729496A4 (en) * | 2017-12-19 | 2021-11-03 | INTEL Corporation | BARRIER MATERIALS BETWEEN BOSSES AND PELLETS |
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TWI397957B (zh) | 2013-06-01 |
KR20080038199A (ko) | 2008-05-02 |
CN100559562C (zh) | 2009-11-11 |
CN101248521A (zh) | 2008-08-20 |
TW200713444A (en) | 2007-04-01 |
EP1915776B1 (en) | 2010-12-29 |
WO2007015938A3 (en) | 2007-03-29 |
WO2007015938A2 (en) | 2007-02-08 |
US7585759B2 (en) | 2009-09-08 |
KR101186347B1 (ko) | 2012-09-26 |
DE102005035772A1 (de) | 2007-02-01 |
EP1915776A2 (en) | 2008-04-30 |
DE602006019266D1 (de) | 2011-02-10 |
US20070023928A1 (en) | 2007-02-01 |
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