JP4247690B2 - 電子部品及その製造方法 - Google Patents
電子部品及その製造方法 Download PDFInfo
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- JP4247690B2 JP4247690B2 JP2006165722A JP2006165722A JP4247690B2 JP 4247690 B2 JP4247690 B2 JP 4247690B2 JP 2006165722 A JP2006165722 A JP 2006165722A JP 2006165722 A JP2006165722 A JP 2006165722A JP 4247690 B2 JP4247690 B2 JP 4247690B2
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- metal layer
- barrier
- electrode
- pad electrode
- base metal
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Description
半導体基板211上にCVD法により酸化膜212を形成した後、LCDドライバICなどの半導体装置を形成する。スパッタ法などによりAlを全面に形成し、フォトリソ・エッチングによりAlをパターニングして、バンプ電極を形成すべき位置に、例えば、50μm×70μm程度の大きさのAl電極パッド213を形成する。CVD法によりSiO2などの絶縁膜を全面に、例えば、0.8〜1.4μm程度の膜厚で、表面保護膜214を形成した後、フォトリソ・エッチングによりAl電極パッド213上の表面保護膜214を除去して、そのAl電極パッド213上にスルーホール15を開孔する。
半導体基板211の表面全体にスパッタ法等により、複数の下地金属層を順次積層形成する。この下地金属層の構成としては、例えば、Alと密着性のよいTi/W216a、Auの拡散を防止するためのPd216bにより構成する。
下地金属層Ti/W216a、Pd216b上にポジ形の感光性樹脂膜を全面に25〜30μm程度の膜厚に被着した後、マスクを用いて、Al電極パッド213上の一部の感光性樹脂膜を露光し、感光性樹脂膜エッチング溶剤に浸して、露光した部位をエッチング(現像)し、Al電極パッド213よりも20μm程度内側のこのAl電極パッド213の上方に、30μm×50μm程度の欠損部を有するバンプ電極形成用パターン217を形成する。次に、下地金属層Ti/W216a、Pd216bを一方の陰極の共通電極として、半導体基板211をシアン化金カリウムまたは亜硫酸金ナトリウムなどのメッキ溶液に浸して、例えば、1A/cm2程度の一定の電流を供給することにより、Auメッキで、例えば、高さが15〜20μm程度のバンプ電極218を形成する。
マスクを用いてバンプ電極形成用パターン217の欠損部の周辺の感光性樹脂膜を、例えば、5μm程度露光し、感光性樹脂膜エッチング溶剤に浸して、露光した部位をエッチングして、そのバンプ電極形成用パターン217よりも各寸法が5μm程度大きい下地金属保護層形成用パターン217aを形成する。
再度、下地金属層Ti/W216a、Pd216bを一方の陰極の共通電極として、半導体基板211をメッキ溶液に浸して、一定の電流(例えば、1A/cm2)を供給することにより、Auメッキで、バンプ電極218の周囲の隙間に、1μm以下の膜厚(この膜圧は、下地金属層Ti/W216a、Pd216bの膜厚により決定する)の下地金属保護層219を形成する。この際に、バンプ電極218上にも同僚のAuメッキが施される。
感光性樹脂膜217aを除去溶剤等で除去し、更に、下地金属保護層219をマスクとして、下地金属層Pd216b、Ti/W216aをエッチング溶液に浸して、ウェットエッチング除去した後、下地金属保護層219を必要に応じてエッチング除去することにより最終的なバンプ電極構造が得られる。この時、下地金属層Pd216bは、下地金属保護層219により被覆されているので、下地金属層Pd216b、Ti/W216aのサイドエッチングが行われる部位がバンプ電極218の直下よりも外側となり、このバンプ電極218の下部の下地金属層Pd216bがエッチングされることがなくなる。そして、例えば、テープキャリアのインナーリードとバンプ電極218をインナーリードボンディングして、実装を終了する。
前記パッド電極を囲む環状パターンの障壁が前記パッド電極と同一面にその周方向に 沿って形成され、前記パッド電極と前記障壁との間に形成される環状の凹部が前記外部 接続用電極の周辺より内側に存在し、
前記パッシベーション層が前記凹部よりも内側位置の前記パッド電極上にまで被着さ れ、前記凹部と同一位置にこの凹部に追随した形状の環状の凹部を有し、
この環状の凹部に追随した表面形状に前記下地金属層が形成されている
ことを特徴とする、電子部品に係るものである。
前記パッド電極を囲む環状パターンの障壁を前記パッド電極と同一面にその周方向に 沿って形成し、この際、前記パッド電極と前記障壁との間に形成される環状の凹部を前 記外部接続用電極の周辺より内側に存在させ、
前記パッシベーション層を前記凹部よりも内側位置の前記パッド電極上にまで被着し 、この際、前記凹部と同一位置にこの凹部に追随した形状の環状の凹部を前記パッシベ ーション層に形成し、
この環状の凹部に追随した表面形状に前記下地金属層を形成する
ことを特徴とする、電子部品の製造方法に係るものである。
第1の実施の形態では、パッド電極14を囲む環状の障壁30の形成を行い、パッド電極及び障壁の上方にバンプ電極(突起電極)の形成を行う。ここで障壁は、以下の各実施の形態と同様に、下地金属層が連続して続く部分の距離及び面積を延長させるためのものであり、サイドエッチングの発生の影響を抑制するために設けるものである。この障壁の形成の形態は、以下の各実施の形態によって異なり、それぞれ各実施の形態において詳述される。
図3(A)で説明したように、半導体基板10上に形成された絶縁層12上に、パッド電極14と、パッド電極14を囲む外周層(障壁リング30によって形成される。)とが形成される。パッド電極14の径は、バンプ電極28の径よりも小さい。
障壁リング30は、パッド電極14と同じ材質で同じ厚さで形成してもよい。また、障壁リング30は、絶縁性材料で形成することもできる。
図3(B)に示すように、全面に、HDPによってHDP−酸化シリコン16a、更に、この上に窒化シリコン18が形成される。パッシベーション層(表面保護層)20はHDP−酸化シリコン(SiO2)16a及び窒化シリコン18によって形成される。
図3(C)の平面図、Z−Z部の断面図に示すように、エッチングによってパッシベーション層に開口部15aが形成される。この結果、パッド電極14の一部が露出される(開口部15aの径はパッド電極14の径よりも小さい。)。
図3(D)の平面図、Z−Z部の断面図に示すように、スパッタ法等によって下地金属層22(黒く塗りつぶして図示している。)が全面に形成される。パッシベーション層20の凹部21aの内部にも下地金属層22が形成されるので、下地金属層22にも凹部21aが形成され段差を生じることになる。なお、下地金属層22は、パッシベーション層20とよく接合し、上面の金属メッキ層のためのシード層(下地)として形成され、金属メッキ層を形成する際の電極として使用される。また、下地金属層22の不要部分は、後工程でウェットエッチングによって除去される。
フォトレジスト24を全面塗布する。
バンプ電極形成用のパターンを露光する。
図3(E)のZ−Z部の断面図に示すように、現像して、バンプ電極(矢印で示すバンプ電極の径28aをもつ。)28の形成用の開口部15cを、フォトレジスト24に形成する。
図3(F)のZ−Z部の断面図に示すように、開口部15cの内部に露出された下地金属層22上に、バリア金属層26が電解メッキによって形成される。なお、バリア金属層26は、金属材料の拡散防止や相互反応防止のために用いられ、隣接する母材との密着性がよい材料が用いられる。
図3(F)に示すように、バンプ電極28が電解メッキによってバリア金属層26上に形成される。
図4(A)のZ−Z部の断面図に示すように、フォトレジスト24を剥離する。
図4(A)とその部分拡大断面図に示すように、バリア金属層26をマスクとして、バリア金属層26の下部を除き、バリア金属層26の外側にある下地金属層22をウェットエッチングによって除去する。この時、ウェットエッチングによって、バリア金属層26の下方にある下地金属層22も、同時にエッチングされてしまう。この結果、バリア金属層26の下方に存在していた下地金属層22が除去されてしまい、サイドエッチング部分36が生じてしまう。
図4(B)のZ−Z部の断面図に示すように、バンプ電極28に半田フラックスを塗布する。
図4(B)に示すように、リフロー炉で加熱処理しバンプ電極28の組成、形状を均一化させる。
図4(B)に示すように、フラックスを洗浄除去して、バンプ電極28の形成工程が終了する。
図7(A)の平面図、X−X部の断面図に示すように、第1の実施の形態と同様に、半導体基板10上に形成された絶縁層12上に、パッド電極14(パッド電極14の形状は第1の実施の形態と同じであるが、径はバンプ電極28の径と同じである。)を形成した後に、全面にパッシベーション層20(酸化シリコン16b、窒化シリコン18からなる。)が形成される。酸化シリコン16bを、HDPに比して密度の低いプラズマを用いて形成したCVD−SiO2膜(例えば、TEOS/O2−CVDや、SiH4/N2O−CVD)としたが、第1の実施の形態と同じようにHDP−SiO2としてもよい。
図7(A)に示すように、パッド電極14上のパッシベーション層20に、中央の第1の開口部15a(例えば、円形の開口部15a)とこれを囲むように障壁を形成するために第2の開口部15b(例えば、円環状の開口部15b)を同時に形成する。第1の開口部15aの径、第2の開口部15bの外径はパッド電極14の径よりも小さい。
従って、下地金属層22の不要部分をウェットエッチングで除去する際に、サイドエッチング部分36が生じても、バリア金属層26の下部に、サイドエッチングされることなく残る下地金属層22の面積が、第1の実施の形態、従来技術よりも大きくなり、バリア金属層26と下地金属層22との接合面積を、第1の実施の形態、従来技術よりも更に大きく確保して、バンプ電極28と半導体基板10との接合強度を保持することができ、信頼性をより向上させることができる。
図10(A)の平面図、Y−Y部の断面図に示すように、第1の実施の形態と同様に、半導体基板10上に形成された絶縁層12上に、パッド電極14(パッド電極14の形状は第1の実施の形態と同じであるが、径はバンプ電極28の径と同じである。)を形成した後に、全面にパッシベーション層20(酸化シリコン16b、窒化シリコン18からなる。)が形成される。酸化シリコン16bを、HDPに比して密度の低いプラズマを用いて形成したCVD−SiO2膜(例えば、TEOS/O2−CVDや、SiH4/N2O−CVD)としたが、第1の実施の形態と同じようにHDP−SiO2としてもよい。
図10(A)に示すように、パッド電極14の径よりも小さい外径をもち、パッド電極14の一部を露出させるためにパッシベーション層20に形成される開口部15aの径よりも大きな内径をもつ、例えば、円形リング状の凸部を感光性樹脂等により絶縁物リングを形成し、障壁リング34とする。この障壁リング34は、パッシベーション層20上に凸部として形成され、下地金属層が連続して続く部分の距離及び面積を延長させるためのものであり、サイドエッチングの発生の影響を抑制するためのものである。また、障壁リング34を導電性材料によって形成してもよいし、酸化シリコン、窒化シリコン等で形成してもよい。
図10(A)に示すように、パッド電極14上のパッシベーション層20に、障壁リング34の内径よりも小さく、パッド電極14の径よりも小さな径をもつ開口部15aを形成する。なお、S1eの工程とS1cの工程とを入れ換えて実行してもよい。
従って、この例では、下地金属層22の不要部分をウェットエッチングで除去する際に、サイドエッチング部分36が生じても、バリア金属層26の下部に、サイドエッチングされることなく残る下地金属層22の面積が、従来技術よりも大きくなり、第1の実施の形態と同様の効果を生じる。
この例では、第1の実施の形態及び参考例において、複数の障壁、例えば、二重の障壁を形成してバンプ電極の形成を行う。
この例では、第1の実施の形態及び参考例における異なるタイプの障壁30、32、34を組み合わせて、二重の障壁を形成してバンプ電極の形成を行う。
障壁30、32、34、バンプ28の形成手順は、第1の実施の形態等を参照すれば、明らかである。
図14は、本発明の各実施の形態及び参考例におけるサイドエッチング36の比較を説明するZ−Z部の断面図である。
図14(E)は、図10の例において、障壁34の高さを高くした場合のサイドエッチング36の発生状況を示している。下地金属層22とバリア金属層26との接合面積が、図10の例の場合よりも増大するので、サイドエッチング36の影響は、図10の例の場合よりも少なくなる。
15a、15b、15c…開口部、16a…HDP−酸化シリコン、
16b…酸化シリコン、20…パッシベーション層、21a…凹部、
21b、21c…凸部、22…下地金属層、24…レジスト、26…バリア金属層、
28…バンプ電極、28a…バンプ電極の径、30、32、34…障壁リング、
30a…欠落部、36…サイドエッチング部分
Claims (4)
- パッド電極と、このパッド電極の一部を露出させる開口部以外を被覆するパッシベーション層と、前記パッド電極上及び前記パッシベーション層上に形成された下地金属層と、前記下地金属層上に形成され、外部接続用電極に対するバリア金属層とを有する電子部品において、
前記パッド電極を囲む環状パターンの障壁が前記パッド電極と同一面にその周方向に 沿って形成され、前記パッド電極と前記障壁との間に形成される環状の凹部が前記外部 接続用電極の周辺より内側に存在し、
前記パッシベーション層が前記凹部よりも内側位置の前記パッド電極上にまで被着さ れ、前記凹部と同一位置にこの凹部に追随した形状の環状の凹部を有し、
この環状の凹部に追随した表面形状に前記下地金属層が形成されている
ことを特徴とする、電子部品。 - 前記開口部の外周囲の全域に亘って、前記凹部が形成されている、請求項1に記載の電子部品。
- 前記凹部が、前記パッド電極の外周囲に形成された前記障壁としての導体パターンと前記パッド電極との間の間隙によって形成され、環状をなしている、請求項1に記載の電子部品。
- パッド電極の一部を露出させる開口部をもつパッシベーション層を形成する工程と、前記パッド電極上及び前記パッシベーション層上に下地金属層を形成する工程と、前記下地金属層上に、外部接続用電極に対するバリア金属層を形成する工程とを有する、請求項1〜3のいずれか1項に記載した電子部品の製造方法において、
前記パッド電極を囲む環状パターンの障壁を前記パッド電極と同一面にその周方向に 沿って形成し、この際、前記パッド電極と前記障壁との間に形成される環状の凹部を前 記外部接続用電極の周辺より内側に存在させ、
前記パッシベーション層を前記凹部よりも内側位置の前記パッド電極上にまで被着し 、この際、前記凹部と同一位置にこの凹部に追随した形状の環状の凹部を前記パッシベ ーション層に形成し、
この環状の凹部に追随した表面形状に前記下地金属層を形成する
ことを特徴とする、電子部品の製造方法。
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JP2830903B2 (ja) | 1995-07-21 | 1998-12-02 | 日本電気株式会社 | 半導体デバイスの製造方法 |
JP3561582B2 (ja) | 1996-09-18 | 2004-09-02 | 沖電気工業株式会社 | 半導体装置の製造方法 |
JPH10189606A (ja) | 1996-12-24 | 1998-07-21 | Miyazaki Oki Electric Co Ltd | 半導体装置のバンプ及びその製造方法 |
JPH10247651A (ja) | 1997-03-04 | 1998-09-14 | Oki Electric Ind Co Ltd | フリップチップ半導体装置の端子構造及びその製造方法 |
JP2958520B2 (ja) | 1998-01-07 | 1999-10-06 | カシオ計算機株式会社 | 半導体装置の接合方法 |
KR100306842B1 (ko) | 1999-09-30 | 2001-11-02 | 윤종용 | 범프 패드에 오목 패턴이 형성된 재배치 웨이퍼 레벨 칩 사이즈 패키지 및 그 제조방법 |
JP2004228295A (ja) | 2003-01-22 | 2004-08-12 | Matsushita Electric Ind Co Ltd | 半導体装置およびその製造方法 |
JP4188752B2 (ja) | 2003-05-23 | 2008-11-26 | 株式会社フジクラ | 半導体パッケージ及びその製造方法 |
JP3794403B2 (ja) | 2003-10-09 | 2006-07-05 | セイコーエプソン株式会社 | 半導体装置 |
JP2005183641A (ja) | 2003-12-19 | 2005-07-07 | Matsushita Electric Ind Co Ltd | 半導体装置およびその製造方法 |
JP4348538B2 (ja) | 2004-05-07 | 2009-10-21 | セイコーエプソン株式会社 | 半導体ウエハ及び半導体チップの製造方法 |
US7176583B2 (en) * | 2004-07-21 | 2007-02-13 | International Business Machines Corporation | Damascene patterning of barrier layer metal for C4 solder bumps |
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TWI346988B (ja) | 2011-08-11 |
TW200814208A (en) | 2008-03-16 |
US20070290343A1 (en) | 2007-12-20 |
CN101136383A (zh) | 2008-03-05 |
JP2007335629A (ja) | 2007-12-27 |
KR20070119553A (ko) | 2007-12-20 |
KR101376429B1 (ko) | 2014-03-20 |
US7728431B2 (en) | 2010-06-01 |
CN100555616C (zh) | 2009-10-28 |
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