JP2010118395A - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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- JP2010118395A JP2010118395A JP2008288861A JP2008288861A JP2010118395A JP 2010118395 A JP2010118395 A JP 2010118395A JP 2008288861 A JP2008288861 A JP 2008288861A JP 2008288861 A JP2008288861 A JP 2008288861A JP 2010118395 A JP2010118395 A JP 2010118395A
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- electrode pad
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Abstract
【解決手段】半導体装置は、複数の第1チップ12(第2チップ16)が、それらの各々が有するパッド形成面の連結電極パッドPが配線21(25)により電気的に接続されるかたちで積層されるブロック15(19)を有するとともに、それらブロック15,19が積層されてなる。このとき、下層になる第1チップ12のパッド形成面には、中継配線23によりその連結電極パッドPと接続された中継電極パッドRPが、上層になる第2チップ16に露出されるかたちでさらに備えられる。そして、実装基板10の基板端子BPにその連結電極パッドPを介して電気的に接続された前記下層の第1チップ12の中継電極パッドRPと前記上層の第2チップ16の連結電極パッドPとが配線27により電気的に接続される。
【選択図】図1
Description
記一方向に沿って拡大してしまう。その結果、規格で定められたサイズがある電子機器、特にSDカードやマイクロSDカードのような電子機器では、上述するような方法が採用され難くなる。
ックに積層されて、前記中継電極パッドと前記第2の連結電極パッドとが前記上層配線により連結されることを要旨とする。
このような構成によれば、中継配線が絶縁層を挟む多層構造に形成されることから、パッド形成面上で交差する複数の中継配線が必要とされる場合であっても、それらが絶縁層により絶縁されるかたちとなる。その結果、中継電極パッドの配置の自由度や中継配線の形状の自由度が高められ、これによって同中継電極パッドに接続される半導体基板の配置の自由度も高められるようになる。したがって、複数の半導体基板における積層態様の自由度が向上される。
拡張されるようになる。ゆえに、各半導体基板の連結電極パッドが配線により連結されるという構造上の制約があれども、上層の半導体基板が実装面の面方向で変位可能であるため、複数の半導体基板からなる積層体のサイズを実装面の面方向で縮小することができる。よって、半導体基板の積層態様が変更可能であるため、半導体基板の占有面積が規格などにより限られる実装基板に対しても、複数の半導体基板を搭載させることができる。
が可能にもなる。
このような方法によれば、中継配線が絶縁層を挟む多層構造に形成されることから、パッド形成面上で交差する複数の中継配線が必要とされる場合であっても、それらが絶縁層により絶縁されるかたちとなる。その結果、中継電極パッドの配置の自由度や中継配線の形状の自由度が高められ、これによって同中継電極パッドに接続される半導体基板の配置の自由度も高められるようになる。したがって、複数の半導体基板における積層態様の自由度が向上される。
以下、本発明の半導体装置を具体化した第1の実施形態について図1〜図5を参照して説明する。図1は半導体装置の正面断面構造を説明するための部分断面図である。図2は半導体装置の一部の斜視構造を示す斜視図であり、(a)は複数の半導体基板である半導体チップの各々がその下層に対して一方向にずれて積層される図であり、(b)は(a)に対応する積層体の上に、さらに複数の半導体チップの各々がその下層に対して前記一方向の反対方向にずれて積層される図である。また、図3は複数の半導体チップの各々がその下層に対して一方向にずれて積層される第1ブロックの平面構造を示す図であり、図4は同第1ブロックに形成される下層配線の平面構造を示す図である。また、図5は複数の半導体チップの各々がその下層に対して前記一方向の反対方向にずれて積層された第2ブロックに形成される上層配線の平面構造を示す図である。
、基板端子BPは、インクジェット法により実装基板10表面に形成されており、同インクジェット法に利用されるインクとしては、導電性微粒子の分散系からなる液状体としての導電性インクが用いられる。導電性インクに含まれるパターン形成材料である導電性微粒子は、数nm〜数十nmの粒径を有する微粒子であり、例えば金、銀、銅、白金、パラジウム、ロジウム、オスミウム、ルテニウム、イリジウム、鉄、錫、コバルト、ニッケル、クロム、チタン、タンタル、タングステン、インジウム等の金属、あるいはこれらの合金を用いることもできる。また分散媒としては、上記導電性微粒子を均一に分散させるものであればよく、例えば水や水を主成分とする水溶液系、あるいはテトラデカン等の有機溶剤を主成分とする有機系を用いることができる。なお、本実施形態の導電性インクにおいては、導電性粒子として銀を用い、分散媒として水を用いている。
形状に形成されている。第1ブロック15において、上下に隣接する2つの第1チップ12は、下層の第1チップ12の表面に形成された絶縁層13と、上層の第1チップ12の裏面に形成された絶縁膜との間に形成される図示しない接着層により所定のずれ長ΔLを有しつつ、各連結電極パッドPが露出されるように相互に接着固定される。これにより、例えば各ずれ長ΔLの長さを250μmとする場合、6枚の第1チップ12が積層された第1ブロック15の縦方向の長さは、1枚の第1チップ12の縦方向の長さCLと、そこにずれ長ΔLだけずれて積層された5枚分の第1チップ12の全ずれ長さ1250μm(=250×5)とが加算された第1ブロック長L11となる。なお本実施形態では、接着層の厚みが5〜10μmであるが、その厚みは5μmより薄くても、10μmより厚くてもよい。
基板10の基板端子BPとそれに対応する各第1チップ12の連結電極パッドPとを各第1チップ12の積層方向に接続する主配線22を有している。さらに、第1の配線21は、第1ブロック15における最上層の第1チップ12である連結用チップ12aのパッド形成面上に、その連結電極パッドPから縦方向に延びる中継配線23を有している。そして、各中継配線23の先端には、第1の配線21とともにインクジェット法により一体的に形成される中継電極パッドRPが接続されている。
(1)連結用チップ12aのパッド形成面には、そこに積層される第2チップ16の連
結電極パッドPに接続される中継電極パッドRPが、第2チップ16よりも基板端子BPから離れた方向に露出されるようにした。そして連結用チップ12aの中継電極パッドRPとそこに積層される第2チップ16の連結電極パッドPとを配線により電気的に接続した。これにより、連結用チップ12aにおける連結電極パッドPと中継電極パッドRPとが連結用チップ12aを構成する第1チップ12に対して180°変更された相対位置に応じて、第1チップ12の上層となる第2チップ16の連結電極パッドPと実装基板10の基板端子BPとの相対位置が、実装面の面方向において180°変位するようになる。つまり、下層になる第1チップ12と上層になる第2チップ16との相対位置が、連結電極パッドPと中継電極パッドRPとの相対位置に応じて、実装面の面方向において変位するようになる。これによりチップ積層体11においては、各半導体チップ12,16の積層態様の自由度が拡張されるようになる。ゆえに、各半導体チップ12,16の連結電極パッドPが配線により連結されるという構造上の制約があれども、上層の半導体チップが実装面の面方向で変位可能であるため、複数の半導体チップからなるチップ積層体のサイズを実装面の面方向で縮小することができる。よって、半導体チップの積層態様が変更可能であるため、半導体チップの占有面積が規格などにより限られる実装基板に対しても、複数の半導体チップを搭載させることができる。
(第2の実施形態)
以下、本発明の半導体装置を具体化した第2の実施形態について図6及び図7を参照して説明する。図6は半導体装置の一部の平面構造を示す図であり、(a)は複数の半導体チップの各々がその下層に対して一方向にずれて積層された状態を示す図であり、(b)は(a)で積層された半導体チップの上に配線が形成された状態を示す図である。図7も半導体装置の一部の平面構造を示す図であり、(a)は図6(a)で形成された配線の上に絶縁層が形成された状態を示す図であり、(b)は(a)で形成された絶縁層の上にさらに配線が形成された状態を示す図である。なお、第1の実施形態と同様の部材には同一の符号を付しその説明を省略する。
2が第2の中継電極パッドRPに接続されるかたちで形成されている。
(5)中継配線が絶縁層30を挟む多層構造に形成されることにより、第1〜第8の配線31を構成しておりパッド形成面上で交差するそれら各配線の中継配線が絶縁層30により絶縁されるかたちに形成された。これにより、中継電極パッドRPの配置の自由度や中継配線の形状の自由度が高められ、これによって同中継電極パッドRPに接続される半導体チップの配置の自由度も高められるようになる。したがって、複数の半導体チップにおける積層態様の自由度が向上される。
(第3の実施形態)
以下、本発明の半導体装置を具体化した第3の実施形態について図8を参照して説明する。図8は半導体チップが積層されて形成される半導体装置の平面構造を示す図である。図8において、(a)は上層の半導体チップが下層の半導体チップに対して一方向にずれて積層された状態を示す図であり、(b)は(a)で積層された半導体チップの上に配線が形成された状態を示す図であり、(c)は(b)で積層され半導体チップの上に、さらに他の半導体チップが積層された状態を示す図である。
の配線により接続される。したがって、この半導体装置によれば、第1チップ12を一方向に連続して積層した場合と同様の電気的な接続結果が確保される。そのうえ、実装面の法線方向から見て、第2ブロックの積層方向が第2ブロックの積層方向に対して右回りに回転しているため、同じ数の半導体チップを積層する上では、半導体チップの占有面積が実装面の面方向において縮小される。
(7)複数の第3チップ41から構成される第1ブロックに対して、第3チップ41が実装面の面方向に沿って右回りに90°だけ回転移動された一対のミラーチップ(第4チップ42)で構成される第2ブロックを、各中継電極パッドRPを露出させるかたちに積層した。これにより、第1ブロックに対して90°の角度においても第2ブロックを積層することができる。すなわち、第4チップ42の下層となる第3チップ41における連結電極パッドPと中継電極パッドRPとの相対位置を90°として、第3チップ41の上層となる第4チップ42の連結電極パッドPと実装基板10の基板端子BPとの相対位置が、実装面の面方向において90°変位するようになる。つまりこれによっても、下層になる第3チップ41と上層になる第4チップ42との相対位置が、連結電極パッドPと中継電極パッドRPとの相対位置に応じて、実装面の面方向において変位するようになる。これによりチップ積層体においては、各半導体チップ41,42の積層態様の自由度がより拡張されるようになる。ゆえに、各半導体チップの連結電極パッドが配線により連結されるという構造上の制約があれども、上層の半導体チップが実装面の面方向で変位可能であるため、複数の半導体チップからなるチップ積層体のサイズを実装面の面方向で縮小することができる。よって、半導体チップの積層態様が変更可能であるため、半導体チップの占有面積が規格などにより限られる実装基板に対しても、複数の半導体チップをより多く搭載させることができるようにもなる。
・上記各実施形態では、実装基板10は可撓性を有するフレキシブル基板であったが、これに限られるものではなく、非可撓性であり剛性を有するリジッド基板などであってもよい。この場合、絶縁体基材からなる基板の基材としては、低温焼結基材としてのガラス系、無機質系としてのセラミック、高温焼結基材系、高熱伝導性基材(単価ケイ素系等)、誘電体材料、抵抗体材料等からなる。これにより、実装基板10の選択の自由度が広げられ、このような半導体装置の用途が高められるようになる。
・上記第2の実施形態では、絶縁層30がインクジェット法により形成されたが、これに限らず、貫通孔が形成された絶縁部材、例えばフレキシブル基板のようなものが積層されて形成されもよい。これにより絶縁層の形成の自由度が高められるとともに、絶縁層の形成に必要とされる時間だけ、半導体チップを実装するために必要とされる時間が短縮されるようになる。
半導体チップの形状は任意の形状、例えば矩形以外の多角形状や円形、楕円形などの形状でもよい。すなわちどのような形状であれ、パッド形成面に形成された電極が露出されるように階段状にずらして積層されるものであれば、このような積層方法により半導体装置が基板上で占有する面積を減少させることができるようになる。
Claims (10)
- 複数の半導体基板の各々が有するパッド形成面の連結電極パッドが配線により電気的に接続されるかたちで前記複数の半導体基板を積層させた半導体装置であって、
下層になる前記半導体基板のパッド形成面には、中継配線によりその連結電極パッドと接続された中継電極パッドが、上層になる前記半導体基板に露出されるかたちでさらに備えられ、
前記複数の半導体基板が実装される実装面の実装電極パッドと前記下層の連結電極パッドとが配線により電気的に接続されるとともに、前記上層の連結電極パッドと前記下層の中継電極パッドとが配線により電気的に接続されることを特徴とする半導体装置。 - 複数の第1の半導体基板の各々が有するパッド形成面の第1の連結電極パッドが前記パッド形成面の法線方向に露出され、かつ連結電極パッドに連結された前記中継電極パッドを有する中継用の基板が最上層になるかたちで前記複数の第1の半導体基板と前記中継用の基板とが積層されるとともに、前記中継用の基板の連結電極パッドと前記各第1の連結電極パッドとが下層配線で前記実装電極パッドに連結された第1ブロックと、
複数の第2の半導体基板の各々が有するパッド形成面の第2の連結電極パッドが前記パッド形成面の法線方向に露出されるかたちで前記複数の第2の半導体基板が積層されるとともに、前記各第2の連結電極パッドが上層配線で連結された第2ブロックとを備え、
前記第2ブロックにおける最下層の半導体基板が前記中継用の基板の連結電極パッドを覆い、かつ前記中継電極パッドを露出するかたちで、前記第2ブロックが前記第1ブロックに積層されて、前記中継電極パッドと前記第2の連結電極パッドとが前記上層配線により連結される
請求項1に記載の半導体装置。 - 前記上層のパッド形成面と前記下層のパッド形成面との間の段差を緩和するかたちで各パッド形成面をつなぐ連続面を有した絶縁性の傾斜部を備え、
前記上層配線及び前記下層配線は、
前記上層の連結電極パッドと前記下層の連結電極パッドとの間を連結して前記連続面に積層された金属膜である
請求項2に記載の半導体装置。 - 前記中継配線が絶縁層を挟む多層構造に形成される
請求項1〜3のいずれか一項に記載の半導体装置。 - 複数の半導体基板の各々が有するパッド形成面の連結電極パッドが配線により電気的に接続されるかたちで前記複数の半導体基板が積層される半導体装置の製造方法であって、
下層になる前記半導体基板のパッド形成面に、中継配線によりその連結電極パッドと接続された中継電極パッドが形成された後、上層になる前記半導体基板が前記中継電極パッドを露出するかたちで前記下層に積層される工程と、
前記複数の半導体基板が実装される実装面の実装電極パッドと前記下層の連結電極パッドとを電気的に接続する配線が形成される工程と、
前記下層に前記上層が積層されてから、前記上層の連結電極パッドと前記下層の中継電極パッドとを連結する配線が形成される工程と
を有することを特徴とする半導体装置の製造方法。 - 複数の第1の半導体基板の各々が有するパッド形成面の第1の連結電極パッドが前記パッド形成面の法線方向に露出され、かつ連結電極パッドに連結された前記中継電極パッドを有する中継用の基板が最上層になるかたちで前記複数の第1の半導体基板と前記中継用の基板とが積層されるとともに、前記中継用の基板の連結電極パッドと前記各第1の連結
電極パッドとが下層配線で前記実装電極パッドに連結されることにより第1ブロックが形成されて、
複数の第2の半導体基板の各々が有するパッド形成面の第2の連結電極パッドが前記パッド形成面の法線方向に露出されるかたちで前記複数の第2の半導体基板が積層されるとともに、前記各第2の連結電極パッドが上層配線で連結されることにより第2ブロックが形成されて、
前記第2ブロックにおける最下層の半導体基板が前記中継用の基板の連結電極パッドを覆い、かつ前記中継電極パッドを露出するかたちで、前記第2ブロックが前記第1ブロックに積層されて、前記中継電極パッドと前記第2の連結電極パッドとが前記上層配線により連結される
請求項5に記載の半導体装置の製造方法。 - 前記上層のパッド形成面と前記下層のパッド形成面との間の段差を緩和するかたちで各パッド形成面をつなぐ連続面を有した絶縁性の傾斜部が形成されて、
前記上層の連結電極パッドと前記下層の連結電極パッドとの間が前記連続面を介して連結されるかたちで導電性微粒子を含む液状体が吐出されて、該液状体が乾燥して焼成されることにより、前記連結電極パッド間を連結する前記配線が形成される
請求項6に記載の半導体装置の製造方法。 - 前記連結電極パッドと前記中継電極パッドとの間が連結されるかたちで、導電性微粒子を含む液状体が吐出されて、該液状体が乾燥して焼成されることにより、前記中継配線が形成される
請求項5〜7のいずれか一項に記載の半導体装置の製造方法。 - 前記中継配線が絶縁層を挟む多層構造に形成される
請求項5〜8のいずれか一項に記載の半導体装置の製造方法。 - 絶縁層形成材料が含まれる液状体が前記パッド形成面に向けて吐出されて、該液状体が乾燥することにより、前記絶縁層が形成される
請求項9に記載の半導体装置の製造方法。
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