JP6290987B2 - 半導体パッケージ基板及びその製造方法 - Google Patents
半導体パッケージ基板及びその製造方法 Download PDFInfo
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- JP6290987B2 JP6290987B2 JP2016143293A JP2016143293A JP6290987B2 JP 6290987 B2 JP6290987 B2 JP 6290987B2 JP 2016143293 A JP2016143293 A JP 2016143293A JP 2016143293 A JP2016143293 A JP 2016143293A JP 6290987 B2 JP6290987 B2 JP 6290987B2
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Description
以下の実施例及び図においては、本発明と直接に係わりのない部分については省略し、図示もしておらず、図中における各部の相対的な大きさの関係は、説明を容易にするためであって、実際の比率に制限を加えるものではない。
図1を参照する。図1は、本発明に係る半導体パッケージ基板の第一の実施例を示す模式図である。図1で示すように、半導体パッケージ基板10は、主に誘電層12と、少なくとも一つのパターン化導体層14を含む。パターン化導体層14は、誘電層12の内部に埋められ、且つパターン化導体層14が少なくとも一つの第一の導体部と、少なくとも一つの第二の導体部とを含む。このうち、第一の導体部と第二の導体部の間は、誘電層12を介して分離される。
誘電層12は、少なくとも一つの開口溝18を有し、これにより、第一の導体部が露出されて第一の導体部が上下両端のいずれも開放式になる。つまり、第一の導体部は、上下両端が誘電層12の外部に露出されている開放端を有し、これにより、第一の導体部を上下層に導電させる導体柱14aとすることができる。また、第二の導体部は、一端が開放するのみ、同層で回路配布(配線)に使用される導線14bとして、誘電層12の外部に露出されている。また、導線14bの一部は、電子素子と接続するための電気接続パッドとしてもよい。
また、パターン化導体層14は、誘電層12の内部に埋められ、パターン化導体層14の一側を覆うための高度を僅かに増加すればよいので、誘電層12の高度は、パターン化導体層14の高度に極近似できる。これにより、基板全体の厚さを大幅に小さくすることができる。
チップ22は、フリップチップ接合の方式で少なくとも一つの接続バンプ23によって保護層16を介して半導体パッケージ基板10における導線14bと電気的に接続されている。シール層24は、チップ22と、チップ22側にあって誘電層12の外部に露出される導体柱14aと、導線14bと、保護層16とを同時に覆うようにシールし、これにより、湿気が外部から進入することを防止できる。スズボール26は、続いて回路板(図示しない)と電気的に接点接続するための電子ピンとして、導体柱14aがシール層24でシールされていない開口溝18に設置されている。
誘電層12の材料は、チップパッケージ用キャスティング化合物、例えば、ノボラック樹脂、エポキシ樹脂、シリコン樹脂或いは他の適切なキャスティング化合物から選ばれるが、これらに限られず、また、キャスティング化合物には、適切な充填剤、例えば粉状の二酸化ケイ素を含んでもよい。
まず、図4Aで示すように、分離できる仮基板40を提供し、前記仮基板40の表面に、複数の開孔422を有するパターン化レジスト層42を形成する。パターン化レジスト層42は、フォトリソグラフィ技術で形成される。本実施例において、仮基板40の材料は、鉄、ニッケル、銅などの金属で、或いは前記金属と誘電材料とを組合わせて形成される。もちろん、異なる技術の必要に応じて任意な変更を行ってもよい。
続いて、図4Dで示すように、キャスティング技術によってパターン化導体層14を覆う誘電層12を形成する。本実施例において、真空プレス成形技術或いはキャスティング技術によって誘電層12を形成することができる。キャスティング技術を使用すると、誘電層12の材料としてチップパッケージ用キャスティング化合物、例えば、ノボラック樹脂、エポキシ樹脂、シリコン樹脂或いは他の適切なキャスティング化合物から選ばれるが、これらに限られず、また、キャスティング化合物は適切な充填剤、例えば粉状の二酸化ケイ素を含んでもよい。
この実施例と第一の実施例の差異は、半導体パッケージ基板50の誘電層12の開口溝18において、更に導電層52が埋め込まれるように設置され、これにより、導体柱14aと導電層52との合計高度が、誘電層12の高度と略一致する点である。
図6で示されるように、パッケージ構造60は、チップ22と、シール層24とを含む。チップ22は接続バンプ23によって、フリップチップ接合方式で保護層16を介して半導体パッケージ基板50における外部に露出される導線14bと電気的に接続される。
シール層24は、チップ22と、チップ側にあって誘電層12から露出される導線14bを覆うようにシールし、湿気が外部から進入することを防止する。パッケージに関するプロセスは公知技術であるので、これについての説明はここで省略する。もちろん、図7で示すように、チップ22を固定ペースト25で半導体パッケージ基板50に仮に固定し、次にワイヤーボンディングによって金属配線32で保護層16を介して半導体パッケージ基板50の上にある導体柱14aと電気的に接続してもよい。
まず、図8Aで示すように、分離式の仮基板40を提供し、この仮基板40の表面に、複数の開孔422を有するパターン化レジスト層42を形成する。
12 誘電層
14 パターン化導体層
14a 導体柱
14b 導線
16 保護層
18 開口溝
20、60 パッケージ構造
22 チップ
23 接続バンプ
24 シール層
25 固定膠
26 スズボール
32 金属配線
40 仮基板
42 パターン化レジスト層
422 開孔
44 導体材料
52 導電層
Claims (5)
- 仮基板の一つの表面にパターン化導体層を形成する工程と、
前記仮基板の前記表面に前記パターン化導体層を覆う誘電層を形成する工程と、
前記誘電層の上に前記パターン化導体層の一部を露出させる開口溝を少なくとも一つ形成する工程と、
前記仮基板を除去して前記パターン化導体層の一側及び前記誘電層の一部を露出させる工程と、を含み、
前記パターン化導体層の一部が前記開口溝から露出されて上下に両端が開放するのは導体柱であり、
前記パターン化導体層の一端のみ開放するのは導線である、
半導体パッケージ基板の製造方法。 - 前記誘電層を形成する工程は、キャスティング化合物を提供することと、前記キャスティング化合物を液体になるまで加熱することと、液体になった前記キャスティング化合物を注いで前記パターン化導体層を包むことと、液体になった前記キャスティング化合物を固化して前記誘電層を形成することと、を含む請求項1に記載の半導体パッケージ基板の製造方法。
- 前記パターン化導体層を形成する工程は、前記仮基板の前記表面に、複数の開孔を有するパターン化レジスト層を形成することと、前記開孔において導体材料を形成することと、前記パターン化レジスト層を除去して前記パターン化導体層を形成することと、を含む請求項1に記載の半導体パッケージ基板の製造方法。
- 少なくとも一つの開口溝を有する誘電層と、
少なくとも一つの、前記誘電層の内部に埋められるパターン化導体層と、を含み、
前記パターン化導体層の一部が前記開口溝から露出されて上下に両端が開放するのは導体柱であり、
前記パターン化導体層の一端のみ開放するのは導線であり、前記導体柱及び前記導線は、前記誘電層によって互いに電気絶縁され、前記導体柱の高さは、前記導線の高さと統一であることを特徴とする、
半導体パッケージ基板。 - 前記請求項4に記載の半導体パッケージ基板からなるパッケージ構造であって、
前記基板表面に設置されるチップと、
前記チップを覆うようにシールするシール層と、を含む、
パッケージ構造。
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