JP5049684B2 - 積層型半導体装置及びその製造方法 - Google Patents
積層型半導体装置及びその製造方法 Download PDFInfo
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- JP5049684B2 JP5049684B2 JP2007188915A JP2007188915A JP5049684B2 JP 5049684 B2 JP5049684 B2 JP 5049684B2 JP 2007188915 A JP2007188915 A JP 2007188915A JP 2007188915 A JP2007188915 A JP 2007188915A JP 5049684 B2 JP5049684 B2 JP 5049684B2
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- semiconductor element
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Description
しかし、図11に示す様に、半導体素子100,100の各周縁近傍に設けられた電極端子と配線基板102のパッドとをワイヤボンディングして電気的に接続することは、金ワイヤ106,106・・を保護すべく、金ワイヤ106,106・・等を樹脂封止することが必要となり、最終的に得られる積層型半導体装置が大型化する。
このため、複数の半導体素子を三次元に配置した積層型半導体装置の小型化を図るべく、下記特許文献1には、図12に示す積層型半導体装置200が提案されている。
図12に示す積層型半導体装置200は、配線基板202の一面側に積層した複数の半導体素子204,204・・の側面に、半導体素子204,204・・の各々の各電極端子と配線基板202のパッドとを電気的に接続する側面配線206,206・・が形成されている。
しかしながら、図12に示す積層型半導体装置200を構成する半導体素子204,204・・としては、その側面側に電極端子が形成されている半導体素子を用いなければならず、一面側に電極端子が形成されている通常の半導体素子を用いることができない。
更に、図12に示す積層型半導体装置200の側面配線206,206・・は、半導体素子204,204・・を回路基板202の一面側に積層した後、半導体素子204,204・・の側面に蒸着法とリフトオフ法とを用いて形成しており、積層型半導体装置200の製造工程を煩雑化している。
ところで、半導体素子204,204・・として、その一面側に電極端子が形成されている半導体素子を用いた場合、半導体素子の側面側に電極端子に一端が接続された再配線を引き出すことを要し、積層型半導体装置200の製造工程を更に煩雑化する。
また、再配線に代えて、半導体素子の電極端子に一端を接続した金ワイヤを側面側に延出しようとしても、金ワイヤが半導体素子の角部で切断されてしまうことが判明した。金ワイヤの半導体素子の角部に相当する部分に、応力が集中され易いためと考えられる。
そこで、本発明の課題は、一面側に電極端子が形成されている通常の半導体素子を用いることができず、且つ半導体装置の製造工程を複雑化する、複数の半導体素子を積層した従来の積層型半導体装置及びその製造方法の課題を解決し、一面側に電極端子が形成されている通常の半導体素子を用いることができ、且つ積層型半導体装置の製造工程の複雑化を防止できる積層型半導体装置及びその製造方法を提供することにある。
また、本発明は、四角形状の半導体素子であって、その各辺に沿って形成された角部のうち、少なくとも前記電極端子が形成された電極端子面側の角部が面取りされてテーパ面に形成された複数の半導体素子を用い、前記半導体素子の各々の各電極端子に一端を接続した金属ワイヤを、前記テーパ面に延出した後、前記半導体素子の各々を、その電極端子形成面が他の半導体素子との接着面又は露出面となるように回路基板の一面側に順次積層し、次いで、前記半導体素子の各テーパ面に延出されている金属ワイヤの少なくとも一部と接触するように、積層された複数の半導体素子の側面に導電性粒子を含有する導電性ペーストを塗布し、前記半導体素子の各電極と回路基板のパッドとを電気的に接続する側面配線を形成することを特徴とする積層型半導体装置の製造方法でもある。
かかる本発明において、金属ワイヤを、半導体素子のテーパ面を越えて側面側に延出することによって、金属ワイヤと側面配線との接合を向上できる。
また、半導体素子として、電極形成面側の辺に沿って形成された角部が面取りされてテーパ面に形成されていると共に、前記電極形成面に対して反対側の辺に沿って形成された角部も面取りされてテーパ面に形成されている半導体素子を用いることによって、積層された複数の半導体素子の側面に塗布した導電性ペーストがテーパ面に入り込み、金ワイヤと側面配線との接触を良好とすることができる。特に、金属ワイヤを、両テーパ面に延出することによって、金属ワイヤと側面配線との接合を更に一層向上できる。
この様に、本発明に係る積層型半導体装置では、半導体素子の電極端子に一端が接続された金属ワイヤを、半導体素子のテーパ面に延出しているため、半導体素子の一面側に電極端子が形成されている通常の半導体素子を用いることができる。
また、本発明に係る積層型半導体装置では、導電性粒子を含有する導電性ペーストを塗布して側面配線を形成するため、側面配線を蒸着法とリフトオフ法とを用いて形成する従来の半導体装置に比較して、その側面配線を容易に形成できる。
この様に、金属ワイヤと導電性ペーストとを接触した場合、金属ワイヤの導電性ペーストとの濡れ性が良好であるため、導電性ペーストが金属ワイヤの周面に集合され易く、隣接する側面配線との接触が避けられ、最終的に得られる積層型半導体装置の信頼性を向上できる。
しかも、積層した複数の半導体素子の側面には、半導体素子のテーパ面から成る開口部が開口されている。このため、積層した複数の半導体素子の側面に塗布した導電性ペーストの一部は開口部内に容易に進入でき、テーパ面に延出された金属リードと接触する。その結果、半導体素子の電極端子に一端が接続された金属リードは側面配線と確実に接触でき、積層型半導体装置の信頼性を更に向上できる。
かかる半導体素子16,16の各々は、四角形状で且つ一面側に電極端子18,18・・を形成した半導体素子である。この半導体素子16の各辺に沿って形成された角部のうち、電極端子18,18・・を形成した電極端子面側の角部が面取りされてテーパ面20に形成されている。
更に、半導体素子16,16のテーパ面20には、一端が電極端子18に接続されている金属ワイヤとしての金ワイヤ22が、テーパ面20に延出されている。
この側面配線24の一部は、図1(a)に示す様に、積層した複数の半導体素子16,16の側面に開口されている、テーパ面20から成る凹溝の開口部内に進入し、テーパ面20に延出した金ワイヤ22と接触している。このため、半導体素子16,16の各々の電極端子18に一端が接続された金ワイヤ22は、側面配線24と確実に接触できる。
次いで、図2(b)に示すV字溝33の最深部を通り且つウェーハ30の面に垂直な直線(点線34で示す)上をダイシングブレードで切断し、テーパ面20が一面側の角部に形成された半導体素子16を得ることができる。
かかる金ワイヤ22の半導体素子16の電極端子18への接続及び延出は、ワイヤボンダーを用いて行う。
先ず、図3(a)に示す様に、ワイヤボンダーのキャピラリー40の先端から引き出した金ワイヤ22の先端をトーチで溶融してボール22aを形成した後、ボール22aを電極端子18上に圧着する。
更に、キャピラリー40をテーパ面20と反対方向に移動してキャピラリー40から所定長さの金ワイヤ22を引き出した後、図3(b)に示す様に、キャピラリー40をテーパ面20の方向への移動を開始する。
引き続いて、図3(c)に示す様に、キャピラリー40をテーパ面20に沿って、テーパ面20の一端縁側から他端縁側方向に移動し、電極端子18に一端が接続された金ワイヤ22の他端がテーパ面20の他端縁まで延出されたとき、図3(d)に示す様に、キャピラリー40によって金ワイヤ22を引き千切る。
この様に、回路基板12の一面側に積層された半導体素子16,16の側面には、図4に示す様に、銀粒子、銅粒子或いはカーボン粒子等の導電性粒子を含有する導電性ペースト25を塗布する。この導電性ペースト25は、塗布装置42を構成する導電性ペーストが充填された充填槽42bから窒素圧等の気体圧によってノズル42aから積層された半導体素子16,16の側面に吐出して塗布する。この際に、塗布装置42を、積層された半導体素子16,16の下方から上方(図4に示す矢印方向)に移動することによって、導電性ペースト25を半導体素子16,16の側面に帯状に形成できる。この帯状の導電性ペースト25の一端は、回路基板12のパッド26と接触している。
このため、回路基板及び半導体素子16,16を加熱炉に挿入して加熱処理することによって、半導体素子16,16の側面に側面配線24を形成でき、半導体素子16,16各々の電極端子18に一端が接続された金ワイヤ22は、側面配線24によって回路基板12のパッド26と電気的に接続できる。
ここで、導電性ペースト25は、金ワイヤ22との濡れ性が良好であるため、導電性ペースト25は金ワイヤ22の周面に集合し易く、隣接する金ワイヤ22に塗布された導電性ペースト22との接触を避けることができ、半導体素子16,16との電気的接続信頼性を向上できる。
図1〜図4に示す積層型半導体装置10では、半導体素子16の電極端子18に一端が接続された金ワイヤ22の他端がテーパ面20に延出されていたが、図5に示す様に、金ワイヤ22のテーパ面20を越えて側面側に延出されていてもよい。
この場合、半導体素子16の電極端子18に一端が接続された金ワイヤ22の延出を、図3に示す様に、ワイヤボンダーのキャピラリー40を用いて行う。この際に、半導体素子16の側面の途中で金ワイヤ22を引き千切ってもよいが、図5に示す様に、半導体素子16の下面側の角部を利用して金ワイヤ22を引き千切ってもよい。
ここで、金ワイヤ22の切断箇所に予めクランプ等によって傷を付けておくことによって、金ワイヤ22を所定箇所で容易に引き千切ることができる。
かかる図6に示す半導体素子16を用いた場合には、電極端子18に一端が接続された金ワイヤ22を、テーパ面20,20を横切るように延出することによって、回路基板12の一面側に積層した半導体素子16,16の側面に形成される側面配線24の一部がテーパ面20,20に進入し、側面配線24と金ワイヤ22との接触を更に向上できる。
更に、図7(b)に示す様に、ウェーハ30の他面側にも、一面側に形成したV字溝33に対応する箇所に、ベベルカット用刃32によってV字溝33を形成する。
次いで、ウェーハ30の両面側に形成したV字溝33,33をダイシングブレードで切断することによって、電極端子形成面側の角部と電極端子形成面に対して反対側面側の角部との各々にテーパ面20,20が形成された半導体素子16を形成できる。
先ず、図8に示す様に、吸着板50上にアルミ箔等の金属箔52を載置すると共に、金属箔52に形成した貫通孔54上に半導体素子16を載置する。金属箔52に載置された半導体素子16は、その電極端子18が形成された電極端子形成面が上面となるように載置される。
かかる金属箔52及び半導体素子16は、吸着板50の吸着力の発現によって、吸着板50の所定箇所に各々吸着固定される。この際に、半導体素子16は、金属箔52の貫通孔54を介して吸着板50の所定箇所に吸着固定される。
この様に、吸着板50の吸着力で固定されている金属箔52の半導体素子16の近傍に、ワイヤボンダーによって金ワイヤ22の一端を接続した後、金ワイヤ22をキャピラリー40から引き出して半導体素子16の電極端子18上に金ワイヤ22の他端を接続して引き千切る。
このため、図9(b)に示す様に、半導体素子16を金ワイヤ22の方向[図6(b)の矢印方向]に移動し、金ワイヤ22が半導体素子16のテーパ面20,20を横切るように、半導体素子16の側面を金ワイヤ22に当接させる。
その後、図9(c)に示す様に、金属箔52の一部を折り曲げて、半導体素子16の電極端子形成面に対して反対側面側に延出されている金ワイヤ22を露出し、反対側面に形成されたテーパ面20を超えて延出されている金ワイヤ22の部分[図9(c)の矢印で示す部分]をカッター等で切断することによって、電極端子18に一端が接続された金ワイヤ22がテーパ面20,20を横切るように延出された半導体素子16を得ることができる。
図6〜図9に示す半導体素子16では、半導体素子16の電極端子18に一端を接続した金ワイヤ22を、両テーパ面20,20を横切るように延出して、電極端子形成面に対して反対側面まで延出しているが、電極端子形成面側のテーパ面20を越えて側面の下端又は途中まで金ワイヤ22を延出してもよい(この場合、電極端子形成面に対して反対側面側のテーパ面20には、金ワイヤ20を延出しない)。
図10に示す積層型半導体装置では、テーパ面20によって形成された開口部内に、側面配線24の一部が進入し、テーパ面20を横切る金ワイヤ22が側面配線24と接触し、金ワイヤ22と側面配線24との接続を確実とすることができる。
また、図1〜図10に示す積層型半導体装置では、半導体素子16,16の電極端子形成面が同一方向を向くように積層されているが、電極端子形成面が互いに対向するように半導体素子16,16を積層してもよい。
12 回路基板
14,14 接着層
16 半導体素子
18 電極端子
20 テーパ面
22 金ワイヤ
24 側面配線
25 導電性ペースト
26 パッド
30 ウェーハ
32 ベベルカット用刃
33 V字溝
40 キャピラリー
42 塗布装置
50 吸着板
52 金属箔
54 貫通孔
Claims (8)
- 四角形状の複数の半導体素子が回路基板に積層されていると共に、前記半導体素子の各電極端子と回路基板に形成されたパッドとを電気的に接続する側面配線が形成された積層型半導体装置であって、
前記半導体素子の各辺に沿って形成された角部のうち、少なくとも前記電極端子が形成された電極端子面側の角部が面取りされて形成されたテーパ面に、前記電極端子に一端が接続された金属ワイヤが延出され、
且つ前記半導体素子の各々の電極端子からテーパ面に延出された金属ワイヤの少なくとも一部が、導電性粒子を含有する導電性ペーストを塗布して形成された側面配線に接触して電気的に接続されていることを特徴とする積層型半導体装置。 - 金属ワイヤが、前記半導体素子のテーパ面を越えて側面側に延出されている請求項1記載の積層型半導体装置。
- 半導体素子が、電極形成面側の辺に沿って形成された角部が面取りされてテーパ面に形成されていると共に、前記電極形成面に対して反対側の辺に沿って形成された角部も面取りされてテーパ面に形成されている請求項1又は請求項2記載の積層型半導体装置。
- 金属ワイヤが、両テーパ面に延出されている請求項3記載の積層型半導体装置。
- 四角形状の半導体素子であって、その各辺に沿って形成された角部のうち、少なくとも前記電極端子が形成された電極端子面側の角部が面取りされてテーパ面に形成された複数の半導体素子を用い、
前記半導体素子の各々の各電極端子に一端を接続した金属ワイヤを、前記テーパ面に延出した後、
前記半導体素子の各々を、その電極端子形成面が他の半導体素子との接着面又は露出面となるように回路基板の一面側に順次積層し、
次いで、前記半導体素子の各テーパ面に延出されている金属ワイヤの少なくとも一部と接触するように、積層された複数の半導体素子の側面に導電性粒子を含有する導電性ペーストを塗布し、前記半導体素子の各電極と回路基板のパッドとを電気的に接続する側面配線を形成することを特徴とする積層型半導体装置の製造方法。 - 金属ワイヤを、前記半導体素子のテーパ面を越えて側面側に延出する請求項5記載の積層型半導体装置の製造方法。
- 半導体素子として、電極形成面側の辺に沿って形成された角部が面取りされてテーパ面に形成されていると共に、前記電極形成面に対して反対側の辺に沿って形成された角部も面取りされてテーパ面に形成されている半導体素子を用いる請求項5又は請求項6記載の積層型半導体装置の製造方法。
- 金属ワイヤを、両テーパに延出する請求項7記載の積層型半導体装置の製造方法。
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