JP5664392B2 - 半導体装置、半導体装置の製造方法、及び配線基板の製造方法 - Google Patents
半導体装置、半導体装置の製造方法、及び配線基板の製造方法 Download PDFInfo
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- JP5664392B2 JP5664392B2 JP2011064837A JP2011064837A JP5664392B2 JP 5664392 B2 JP5664392 B2 JP 5664392B2 JP 2011064837 A JP2011064837 A JP 2011064837A JP 2011064837 A JP2011064837 A JP 2011064837A JP 5664392 B2 JP5664392 B2 JP 5664392B2
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Description
その後、図14Bに示すように、はんだ層202の融点以上の温度条件下で対向するはんだバンプ200を接触させ、はんだ層202間の接続を行う。このとき、フリップチップボンダーにより半導体装置205a、205b間の距離(ギャップ)を制御しながら、一方の半導体装置205aを他方の半導体装置205b側に接近させる。
1.第1の実施形態:半導体装置
1−1 半導体装置の構成
1−2 半導体装置の製造方法
1−3 変形例1
1−4 変形例2
2.第2の実施形態:半導体装置
3.第3の実施形態:配線基板の製造方法
まず、本開示の第1の実施形態に係る半導体装置、及びその半導体装置の製造方法について説明する。
図1に、本開示の第1の実施形態に係る半導体装置50のはんだバンプ1が形成された部分の断面構成を示す。図1に示すように、本実施形態例の半導体装置50は、半導体基板5の回路面上に形成された電極パッド部9と、電極パッド部9の周縁及び半導体基板5の回路面を覆う絶縁膜(以下パッシベーション膜)6とを備える。そして、電極パッド部9上に順に形成された密着層7及びシードメタル層8と、そのシードメタル層8上部に順に形成されたバリアメタル層2、及びはんだ層3とで構成されるはんだバンプ1を備える。さらに、はんだバンプ1を構成するバリアメタル層2上面にはストッパ膜4が形成されている。
パッシベーション膜6は、例えばSiN又はSiO2からなり、電極パッド部9の中央部分を露出する開口部10を有し、電極パッド部9の周縁及び半導体基板5表面を被覆するように形成されている。
シードメタル層8は、例えばCuからなり、密着層7上部に形成されている。シードメタル層8は、バリアメタル層2を電解めっきで形成するために設けられる層である。
図2A〜図5Kに、本実施形態例の半導体装置50の要部の製造工程図を示す。図2A〜図5Kを用いて、本実施形態例の半導体装置50の製造方法について説明する。
次に、図3Eに示すように、図2Aの工程において、パッシベーション膜6に露出された電極パッド部9の領域よりも少し大きい領域が開口されたマスク12を第1のフォトレジスト層11上部に形成し、露光する。
次に、図5Jに示すように、O2ガスを用いて第1及び第2のフォトレジスト層11、14をアッシングし除去する。このアッシング工程により、露出したバリアメタル層2表面にストッパ膜4となるNiの酸化膜が形成される。このNiの酸化膜は、はんだ層3に対して濡れ性の悪い膜であり、はんだ層3が横方向に流れるのを防ぐストッパ膜4として用いられる。その後、露出したシードメタル層8をウェットエッチングで除去し、続けて、露出した密着層7をウェットエッチングで除去する。
次に、本実施形態例で形成されたはんだバンプを備える半導体装置50同士をはんだバンプを介して接続する工程について説明する。図6A、Bは、本実施形態例で形成された2つの半導体装置をはんだバンプを介して接合する工程を示す図である。図6A、Bでは、半導体装置50において、半導体基板5と、その半導体基板5上に形成されるバリアメタル層2及びはんだ層3から成るはんだバンプ1のみを図示し、その他の構造は省略して示す。
ところで、上述したように、フリップチップボンダーに起因する上側半導体装置50aの傾きや反り、又は半導体装置50のグローバルな段差により、接合時に上側半導体装置50aと下側半導体装置50bとのギャップに差が出ることがある。図7Aに、ギャップ差が広い領域における断面の拡大図(図6Bのaに相当)を示し、図7Bに、ギャップ差が狭い領域における断面の拡大図(図6Bのbに相当)を示す。
このように、本実施形態例では、様々な接合方法に適用可能である。
図8A、Bに、変形例1に係る半導体装置と半導体装置の接合工程図を示す。変形例1では、本実施形態例で形成したはんだバンプ1を有する半導体装置50と、従来のはんだバンプ200を有する半導体装置205とを接合する例について説明する。
次に、図9A、Bに、変形例2に係る半導体装置と配線基板との接合工程図を示す。変形例2では、配線基板102に、本実施形態例のはんだバンプ1を有する半導体装置50を接合する例について説明する。図9Aに示すように、本実施形態例では、マウントされる側に配線基板102を配置し、マウントする側を本実施形態例のはんだバンプ1が形成された半導体装置50とする。
その他、第1の実施形態と同様の効果を得ることができる。
次に、本開示の第2の実施形態に係る半導体装置、及び半導体装置の製造方法について説明する。本実施形態例では、ストッパ膜を、はんだ層に対して濡れ性の悪い金属材料で形成する例である。
次に、図11Dに示すように、図4Hと同様にして、はんだ層3が形成される部分のみを開口する第3のフォトレジスト層22を形成する。その後、電解めっき法を用い、第3のフォトレジスト層22の開口に露出したバリアメタル層2上部にSnからなるはんだ層3を2〜10μmの厚みに形成する。
その後、第3のフォトレジスト層22を除去し、第1の実施形態と同様にしてシードメタル層8、及び密着層7を除去することにより、半導体基板5上にはんだバンプ1が形成される。
また、本実施形態例の半導体装置50では、ストッパ膜20が金属材料で形成されるため、酸化膜でストッパ膜20を形成する場合よりもはんだ層3がぬれ広がりにくくなる。
その他、第1の実施形態と同様の効果を得ることができる。
次に、本開示の第3の実施形態に係る配線基板の製造方法について説明する。本実施形態例では、プリント配線基板に形成された電極パッド部(以下、配線ランド)に、はんだ層をパターニング形成する例である。図12A〜図12Dに、本実施形態例の配線基板の製造工程を示す
その他、第1の実施形態と同様の効果を得ることができる。
(1)
基板の電極パッド部上に形成されたバリアメタル層と、
前記バリアメタル層上面の中央部に形成され、外径よりも小さい外径を有して形成されたはんだ層とからなるはんだバンプ
を備える半導体装置。
(2)
前記バリアメタル層上面のはんだ層が形成されていない面には、溶融したはんだ層に対して濡れ性の悪い材料からなるストッパ膜が形成されている
(1)に記載の半導体装置。
(3)
ストッパ膜は、酸化膜からなる
(2)に記載の半導体装置。
(4)
ストッパ膜は、金属材料からなる
(2)に記載の半導体装置。
(5)
基板に形成された電極パッド部上部に、バリアメタル層を形成する工程と、
前記バリアメタル層上部に、前記バリアメタル層の外径よりも小さい外径のはんだ層を形成する工程と、
を含む半導体装置の製造方法。
(6)
前記バリアメタル層は、電極パッド部の中央部が開口した第1のフォトレジスト層を介して形成し、
前記はんだ層は、前記バリアメタル層の中央部が開口され、前記第1のフォトレジスト層の開口の内径よりも小さい内径の開口を有する第2のフォトレジスト層を介して形成する
(5)記載の半導体装置の製造方法。
(7)
さらに、前記バリアメタル層上面のはんだ層が形成されない領域に、前記はんだ層に対して濡れ性の悪い材料からなるストッパ膜を形成する工程を有する
(6)に記載の半導体装置の製造方法。
(8)
アッシングにより、前記第1及び第2のフォトレジスト層を除去する工程を有し、
前記ストッパ膜は、前記アッシングによって前記バリアメタル層上面に形成される酸化膜によって構成する
(7)に記載の半導体装置の製造方法。
(9)
前記ストッパ膜は、前記はんだ層を形成する前に、前記バリアメタル層上面の周縁に形成する
(7)に記載の半導体装置の製造方法。
(10)
前記ストッパ膜は、の金属材料で形成する
(9)に記載の半導体装置の製造方法。
(11)
基板に形成された電極パッド部の中央部を開口するフォトレジスト層を形成する工程と、
前記フォトレジスト層を介して前記電極パッド部上部にはんだ層を形成する工程と、
を含む配線基板の製造方法。
Claims (3)
- 基板の電極パッド部上に形成されたバリアメタル層と、
前記バリアメタル層上面の中央部に形成され、外径よりも小さい外径を有して形成されたはんだ層とからなるはんだバンプとを備え、
前記バリアメタル層上面のはんだ層が形成されていない面には、溶融したはんだ層に対して濡れ性の悪い材料からなるストッパ膜が形成されており、前記ストッパ膜は、前記バリアメタル層及び前記はんだ層を形成する際に用いたフォトレジスト層をアッシングにより除去する工程で前記バリアメタル層上面に形成された酸化膜で構成されている
半導体装置。 - 基板に形成された電極パッド部上部に、電極パッド部の中央部が開口した第1のフォトレジスト層を介してバリアメタル層を形成する工程と、
前記バリアメタル層上部に、前記バリアメタル層の中央部が開口され、前記第1のフォトレジスト層の開口の内径よりも小さい内径の開口を有する第2のフォトレジスト層を介して前記バリアメタル層の外径よりも小さい外径のはんだ層を形成する工程と、
前記バリアメタル層上面のはんだ層が形成されない領域に、前記はんだ層に対して濡れ性の悪い材料からなるストッパ膜を形成する工程と、を有し、
前記第1及び第2のフォトレジスト層はアッシングにより除去され、前記ストッパ膜は、前記アッシングによって前記バリアメタル層上面に形成される酸化膜によって形成する
半導体装置の製造方法。 - 基板に形成された電極パッド部の中央部を開口するフォトレジスト層を形成する工程と、
前記フォトレジスト層を介して前記電極パッド部上部にはんだ層を形成する工程と、
前記電極パッド部上面のはんだ層が形成されない領域に、前記はんだ層に対して濡れ性の悪い材料からなるストッパ膜を形成する工程と、を有し、
前記フォトレジスト層はアッシングにより除去され、前記ストッパ膜は、前記アッシングによって前記電極パッド部上面に形成される酸化膜によって形成する
配線基板の製造方法。
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JP2012204391A (ja) | 2012-10-22 |
US9066457B2 (en) | 2015-06-23 |
CN102693951A (zh) | 2012-09-26 |
KR20120109309A (ko) | 2012-10-08 |
TW201243971A (en) | 2012-11-01 |
TWI495024B (zh) | 2015-08-01 |
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