JP2001144125A - 半導体装置および半導体装置の形成方法 - Google Patents

半導体装置および半導体装置の形成方法

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Publication number
JP2001144125A
JP2001144125A JP32015999A JP32015999A JP2001144125A JP 2001144125 A JP2001144125 A JP 2001144125A JP 32015999 A JP32015999 A JP 32015999A JP 32015999 A JP32015999 A JP 32015999A JP 2001144125 A JP2001144125 A JP 2001144125A
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Japan
Prior art keywords
bump
semiconductor device
protective material
package
semiconductor
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Granted
Application number
JP32015999A
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English (en)
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JP3672297B2 (ja
Inventor
Takashi Hosaka
俊 保坂
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Seiko Instruments Inc
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Seiko Instruments Inc
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Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP32015999A priority Critical patent/JP3672297B2/ja
Priority to US09/639,709 priority patent/US6475897B1/en
Publication of JP2001144125A publication Critical patent/JP2001144125A/ja
Application granted granted Critical
Publication of JP3672297B2 publication Critical patent/JP3672297B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

(57)【要約】 【課題】 ICチップと同じ大きで高品質のICパッケ
ージを安価な製造方法で提供する。 【解決手段】 半導体素子が形成されている半導体基板
の電極パッドに凸形バンプが接着しており、凸型バンプ
の柱部分と水平部分の一部が露出し他の部分は保護材料
でおおわれているICパッケージである半導体装置とこ
の半導体装置を製造する方法。すなわち、保護材料の柱
部分の窓をあける時に、マスク材料を用いて、窓を写真
食刻法でパターニングし、保護材料をエッチング除去し
て行う。

Description

【発明の詳細な説明】
【発明の属する技術分野】本発明はICチップと同じ大
きさの、いわゆるチップサイズパッケージの構造とその
製造方法に関する。
【従来の技術】これまでに作成されているチップサイズ
パッケージと呼ばれるものは、ICチップを一個に分離
してからICパッケージを作成していた。
【発明が解決しようとする課題】ICパッケージの中に
ICを入れるためには、かなりの余裕度を取らねばなら
ず、チップサイズパッケージといいながら、実際のサイ
ズはICチップよりかなり大きくなっていた。また、I
Cパッケージ製造の工程が複雑で長いため費用がかか
り、かつ作成期間が長かった。
【課題を解決するための手段】上記の問題点を解決する
ために、本発明はウエハ状態でICパッケージを作成
し、ICチップと同じ大きさのICパッケージを提供す
る。すなわち、ウエハ状態で電極パッドにバンプを接着
した後で、保護材料を塗布しマスク方法にてバンプ部分
を露出させる。その後、スクライブラインでウエハを切
断しICパッケージを完成させる。
【実施例】本発明は、集積回路(IC)チップと同じ大
きさのICパッケージを提供する技術に関するものであ
る。以下にこの発明の実施例を図面に基づいて説明す
る。図1は、ウエハサイズで形成された本発明の構造を
示すICパッケージの断面図を示す。半導体基板1の表
面に電極パッド2が形成されている。また、半導体基板
1の表面は保護膜3でおおわれている。半導体基板内に
は集積回路が形成されている。図1では半導体基板内の
集積回路は省略する。以上のようにしてICチップが構
成される。本発明は、このICチップの電極パッド2に
バンプ4が接着している。バンプ4の形状は図1に示す
ように凸形をしている。ICチップの表面は保護材料5
で覆われている。バンプ4の凸形部分の柱状部分4aは
露出しており、外部電極との接点となる。保護材料5は
バンプ4の凸形部分の水平部分4bで切れている。以上
のようなICパッケージは次のような特徴がある。 (1)ICチップと同じ大きさである。 (2)ICチップは完全に保護材料5でおおわれてい
る。この事により、ICチップへの外部環境からの異物
の浸入は阻止されている。たとえば、外部の水分の浸入
はないため、ICチップの水分による問題、たとえば電
極パッドの腐食は発生しない。 (3)バンプ4の柱部分4aは保護材料5より突出して
いるため、外部電極との接続が容易である。この事を図
2により説明する。図2(a)は、図1のウエハサイズで
形成されたICパッケージの集合体を個片にした状態の
1個のICパッケージの断面構造図である。図2(b)
は、図2(a)のICパッケージを実装基板に取付けた状
態を示す。実装基板16の表面に配線17が形成されて
いる。配線17とバンプ14の柱部分14aが接着して
いる。バンプ14の柱部分14aが保護材料15より突
出しているため、外部配線17との接続が容易となる。 (4)保護材料5はICチップを強固に保持しているた
め、ICパッケージの強度はICチップ単体の強度に比
較し格段に向上している。 (5)構造が簡単なため、材料費を含めた製造コストが
非常に安い。以上のように、本発明によるICパッケー
ジはチップサイズパッケージとして使用できる。 次に、本発明のICパッケージの製造方法について詳細
に述べる。図3(a)は、ICチップがまだ切断されてい
ない段階のウエハ状態を示す図である。ウエハ内には多
数のICが存在する。半導体基板21内には半導体素子
が多数形成されている。図中、半導体基板21は、シリ
コン(Si)半導体やガリウムひ素などの化合物半導体、
あるいは他の半導体である。電極パッド22の材料は、
アルミニウム(Al)やアルミニウムの合金や不純物元素
の入ったアルミニウム、あるいは銅(Cu)が銅の合金や
不純物の入った銅、あるいは他の金属などである。 保
護膜23の材料は、シリコン酸化膜(SiO2)やシリ
コン窒化膜(SiNx)やポリイミド膜、あるいは他の
絶縁膜などである。次に図3(b)に示すように、図1で
示されたICが多数形成されたウエハ状態のままで、電
極パッド22にバンプ24を接着する。図3(c)は、図
3(b)の電極パッド22の周辺を拡大した図である。バ
ンプ24の形状は図3(c)に示すように凸形の形状をな
るように形成する。バンプ24の形成方法の1つとし
て、ワイヤボンダー装置を用いる方法がある。その方法
を図7、図8を用いて説明する。図7(a)において、金
属線34の先にワイヤボンディング装置で丸い金属ボー
ル35を形成する。次に図7(b)に示すように、金属ボ
ール35をICの電極パッド 32に押し付け、熱圧着
か超音波圧着などの方法により、金属ボール35とIC
の電極パッド32を接着する。次に図8に示すように、
金属線34を適当な長さの所34aで切断して、バンプ
36とバンプ柱部分36aを形成する。以上の事をウエ
ハレベルで行うのであるが、ウエハサイズで見れば、バ
ンプ36の高さはばらつきがあるので全体の高さをそろ
えるために、図8の工程の後でベベリングという工程を
加える事もある。金属線34、金属ボール35、バンプ
36の材料として、金(Au)、パラジウム(Pd)、アル
ミニウム(Al)、銀(Ag)、 鉛(Pb)と錫(Sn)の
半田合金、銀(Ag)と錫(Sn)の合金、その他の金属など
がある。次に図4(a)に示すように、保護材料25を付
着する。図4(b)は、図4(a)のバンプ24の周辺を拡
大した図である。保護材料25は、液体状の材料でウエ
ハ全体に塗布する事ができる。塗布する時の液体状の保
護材料25の厚みは、最終的な厚みを考慮して決定しな
ければならない。すなわちバンプ24の柱24aの先よ
り、保護材料25の上面が最終的に上にならないよう
に、塗布する時の液体状の保護材料25の厚みを調整す
る。そして、塗布した後で適当な温度でベークして液体
状の保護材料25を固形化する。次に図5(a)に示すよ
うに、感光性材料のフォトレジストなどの材料を塗布
し、写真食刻法を用いマスク26を作成する。次に図5
(b)に示すように、マスク26に沿って保護材料25を
除去する。図5(c)は、図5(b)のバンプ24の周辺部
分を拡大した図である。マスク26は、バンプ24の柱
部分24aを露出させ、かつバンプ24の水平部分24
bの所で切れるようにする。保護材料25を除去する方
法として、マスク26をエッチングしにくく、保護材料
25をエッチングしやすいエッチング方法を用いればよ
い。あるいは、乾式エッチング方法を用いて、マスク2
6のパターンがあいている所から保護材料25をエッチ
ング除去しても良い。さらにまた、ウエハをICパッケー
ジ毎に切断する時のためにウエハ内のスクライブライン
の保護材料25も除去しておく事が望ましい。この時、
スクライブライン部分のマスク26は前もって開いてい
る。次に図6(a)に示すように、マスク26を取り除
く。図6(b)は、図6(a)のバンプ24の周辺部分を拡
大した図である。バンプ24の柱部分24aと水平部分
24bの一部は露出した状態にある。この状態のウエハ
を高温でアニールする事により、保護材料25はより安
定した保護材料となり、ICを機械的・化学的に強化す
る。これでウエハの中に多数のICパッケージが完成し
たわけであるが、次にこれらをひとつひとつ分離する工
程について述べる。すなわち、図6(a)において、ウエ
ハ内のスクライブライン27に沿って、ダイシング装置
を用いて切断し、ICパッケージを分離する。このIC
パッケージの切断の時に、切断すべきウエハ内の場所、
すなわちスクライブライン27の所の保護材料25を前
もって除去しておけば、比較的簡単にスクライブライン
27に沿って切断できる。次に、バンプの高さ、保護材
料の厚さについて述べる。これらは、ICパッケージの
使用環境によって異なる。図9において、電極パッド5
2の開口部の大きさをa、電極パッド52の部分の保護
膜53の厚みをb、バンプ54の平坦部分54bの高さ
をc、バンプ54の平坦部分54bの大きさをd、バン
プ54の柱部分54aの高さをe、柱部分54aの大き
さをf、保護材料55の厚みをgとする。バンプ54の
平坦部分54bの大きさdは、一般的には電極パッド5
2の開口部の大きさaより小さい。ただし、バンプ54
が電極パッド52を完全に被うことができれば、dはa
より大きくても良い。バンプ54の柱部分54aの大き
さfは、バンプの54の平坦部分54bの大きさdより
小さい。保護材料55の開口部とバンプ柱部分との距離
hは限りなくゼロで良いが、バンプ54の柱部分54a
にかぶると外部配線との接続不良を起こす恐れがあるの
で、マスクの合わせ余裕度とバンプ54の位置の精度と
保護材料のエッチング精度とサイドエッチ量などを考え
て値を決める必要がある。バンプ54の平坦部分54b
の端と保護材料55の開口部との距離iも原理的にはゼロ
で良いが、この部分からの水分など外部環境の異物が浸
入する可能性が最も大きいので、保護材料55はバンプ
54の平坦部分54bに確実にかかっている必要があ
る。たとえばバンプ54の位置精度がxミクロンm、マ
スクの合わせ誤差yミクロンm、保護材料55のエッチ
ングの精度zミクロンm、サイドエッチ量wミクロンm
とするとiはx+y+z+wより大きくなければならな
い。バンプ54の柱部分54aの大きさfは、ワイヤボ
ンディングで形成する場合は、金属線の太さで決まる。
このfは、外部配線と接続するので、その点からの設計
も必要となる。次にバンプ54の平坦部分54bの高さ
cは、ICパッケージをどの程度の強度を持たせるか、
どの程度の信頼性を要求するかで決定される。一般的に
は10ミクロンm〜50ミクロンmあれば良い。また、
バンプ54の柱部分54aの高さeは、保護材料55の
厚みgからcを引いた値より大きくし、保護材料55よ
り上にバンプの頭を出す必要がある。どのくらい頭を出
すかは、このICパッケージを実装する技術によるが、
10ミクロンm以上出しておけば実装側からは安全であ
ろう。保護材料の厚みgは、バンプ54の平坦部分54
bをおおうのでcよりは大きくなければならない。一般
的には、gは12ミクロンm〜70ミクロンmとする。
尚、図5、図6では、水平部分に保護材料の端が来るよ
うにしたが、マスクおよびエッチング条件を選ぶことに
より、バンプの柱部分だけを露出するようにできること
はいうまでもない。
【発明の効果】以上、説明したようにウエハ状態でIC
パッケージを作成するので、工程がかなり少なくなり大
幅な費用削減と大幅な納期短縮ができる。また、凸形バ
ンプを使用し保護材料がバンプの水平部分をおおってい
るので、信頼性と品質が非常に高い。
【図面の簡単な説明】
【図1】本発明の半導体装置であるウエハサイズのIC
パッケージの構造を示す図である。
【図2】本発明の半導体装置を実装状態を示す図であ
る。
【図3】本発明の半導体装置の製造方法を示す図であ
る。
【図4】本発明の半導体装置の製造方法を示す図であ
る。
【図5】本発明の半導体装置の製造方法を示す図であ
る。
【図6】本発明の半導体装置の製造方法を示す図であ
る。
【図7】本発明の半導体装置に用いるバンプを作成する
方法を示す図である。
【図8】本発明の半導体装置に用いるバンプを作成する
方法を示す図である。
【図9】本発明の半導体装置の寸法を説明する図であ
る。
【符号の説明】
1、11、21、31、51 半導体基板 2、12、22、32、52 電極パッド 3、13、23、33、53 保護膜 4、14、24、36、54 バンプ 5、15、25、55 保護材料 4a、14a、24a、54a バンプの柱部分

Claims (7)

    【特許請求の範囲】
  1. 【請求項1】 半導体素子が形成されている半導体基板
    の電極パッドに凸形バンプが接着しており、凸形バンプ
    の水平部分の一部と柱部分が露出し他の部分は保護材料
    でおおわれている半導体装置。
  2. 【請求項2】 凸形バンプ柱部分は保護材料より飛び出
    している請求項1記載の半導体装置。
  3. 【請求項3】 半導体素子が形成されている半導体基板
    の電極パッドに凸形バンプが接着しており、凸形バンプ
    の柱部分が露出し他の部分は保護材料でおおわれている
    半導体装置。
  4. 【請求項4】 半導体基板の中に半導体素子を形成した
    後に、半導体素子の電極パッドにバンプを接着する工程
    と半導体素子を保護する材料を塗布する工程と、前記バ
    ンプの水平部分の一部と柱部分を露出する工程とを含む
    請求項1および請求項2記載の半導体装置の製造方法。
  5. 【請求項5】 半導体基板の中に半導体素子を形成した
    後に、半導体素子の電極パッドにバンプを接着する工程
    と半導体素子を保護する材料を塗布する工程と前記バン
    プの柱部分を露出する工程とを含む請求項3記載の半導
    体装置の製造方法。
  6. 【請求項6】 凸形バンプはワイヤボンディング装置を
    用いて形成する請求項4および請求項5記載の半導体装
    置の製造方法。
  7. 【請求項7】 半導体基板の中に半導体素子を形成した
    後に、半導体素子の電極パッドにバンプを接着する工程
    と半導体素子を保護する感光性の材料を塗布する工程と
    写真食刻法を用い前記バンプの柱部分を露出する工程と
    を含む請求項2、請求項3、および請求項5記載の半導
    体装置の製造方法。
JP32015999A 1999-11-10 1999-11-10 半導体装置の製造方法 Expired - Fee Related JP3672297B2 (ja)

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JP3146345B2 (ja) * 1996-03-11 2001-03-12 アムコー テクノロジー コリア インコーポレーティド バンプチップスケール半導体パッケージのバンプ形成方法
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