JP5645047B2 - 半導体素子搭載用パッケージ基板とその製法及び半導体パッケージ - Google Patents
半導体素子搭載用パッケージ基板とその製法及び半導体パッケージ Download PDFInfo
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- JP5645047B2 JP5645047B2 JP2009222736A JP2009222736A JP5645047B2 JP 5645047 B2 JP5645047 B2 JP 5645047B2 JP 2009222736 A JP2009222736 A JP 2009222736A JP 2009222736 A JP2009222736 A JP 2009222736A JP 5645047 B2 JP5645047 B2 JP 5645047B2
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]
- H05K1/183—Components mounted in and supported by recessed areas of the printed circuit board
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09509—Blind vias, i.e. vias having one side closed
- H05K2201/09518—Deep blind vias, i.e. blind vias connecting the surface circuit to circuit layers deeper than the first buried circuit layer
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/0959—Plated through-holes or plated blind vias filled with insulating material
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/06—Lamination
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- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4053—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques
- H05K3/4069—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques for via connections in organic insulating substrates
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- H05K3/46—Manufacturing multilayer circuits
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Description
(1) キャビティ材とエラストマー材である接着剤とを備え、これらを貫通する開口及び貫通孔を有するキャビティ層と、前記接着剤を介して前記キャビティ層に積層されたベース層と、前記開口によって形成されたキャビティ部と、前記貫通孔によって形成されたキャビティ材と接着剤とを貫通する有底ビアと、を有する半導体素子搭載用パッケージ基板において、前記キャビティ層のキャビティ材と接着剤とを貫通する有底ビアに、前記ベース層上の接続パッドと前記キャビティ層上の接続端子Aとを接続する層間接続が設けられ、この層間接続が、前記キャビティ層の有底ビア内の前記接続パッド及び接着剤を含む内壁にめっきにより形成された金属被覆を有し、熱硬化性の導電樹脂が充填され、硬化されたものである半導体素子搭載用パッケージ基板。
(2) 上記(1)において、キャビティ層の層間接続が、ベース層のキャビティ層側の面に設けられた接続パッドと、この接続パッドを底面として前記キャビティ層に形成された有底ビアと、この有底ビア内に充填された導電樹脂と、この導電樹脂上に設けられた接続端子Aにより形成される半導体素子搭載用パッケージ基板。
(3) 上記(1)又は(2)において、ベース層のキャビティ層と反対側の面に接続端子Bが設けられ、前記接続端子Aは接続端子Bよりもサイズ及びピッチが小さい半導体素子搭載用パッケージ基板。
(4) キャビティ材とエラストマー材である接着剤とを備えるキャビティ層に前記キャビティ材と接着剤とを貫通する開口と貫通孔を形成する工程と、前記キャビティ層に積層するベース層の一方の面に接続パッドを形成する工程と、前記貫通孔が接続パッドに塞がれて前記キャビティ材と接着剤とを貫通する有底ビアを形成するように、前記接着剤を介して前記キャビティ層とベース層とを積層する工程と、前記有底ビアに熱硬化性の導電樹脂を充填し硬化する工程と、前記導電樹脂上に接続端子Aを形成する工程と、を有し、前記有底ビアに導電樹脂を充填する前に、前記有底ビア内の前記接続パッド及び接着剤を含む内壁にめっき層を形成する半導体素子搭載用パッケージ基板の製造方法。
(5) キャビティ部を有する半導体素子搭載用パッケージ基板と、前記キャビティ部内に搭載された半導体素子と、この半導体素子を封止する封止剤と、前記半導体素子搭載用パッケージ基板の一方の面に形成された接続端子Aと、他方の面に形成された接続端子Bを有する半導体パッケージにおいて、前記キャビティ部が、キャビティ材とエラストマー材である接着剤とを備え、これらを貫通する開口及び貫通孔を有するキャビティ層と、前記接着剤を介して前記キャビティ層に積層されたベース層とによって形成され、前記キャビティ層に前記ベース層上の接続パッドと前記キャビティ層上の接続端子Aとを接続する層間接続が設けられ、この層間接続が導電樹脂により形成される半導体パッケージであって、前記キャビティ層の層間接続が、ベース層のキャビティ層側の面に設けられた接続パッドと、この接続パッドを底面として前記キャビティ層のキャビティ材と接着剤とを貫通するように形成された有底ビアと、この有底ビア内の前記接続パッド及び接着剤を含む内壁に形成された金属被覆と、前記有底ビア内に充填され硬化された熱硬化性の導電樹脂と、この導電樹脂上に設けられた接続端子Aにより形成される半導体パッケージ。
(6) 上記(5)において、前記封止剤の最上部が、前記半導体素子搭載用パッケージ基板の接続端子Aと同等以下の高さである半導体パッケージ。
(7) 上記(5)又は(6)において、接続端子Aが他の半導体素子搭載用パッケージ基板の接続端子と接続され、接続端子Bよりもサイズ及びピッチが小さい半導体パッケージ。
(8) 上記(5)から(7)の何れかにおいて、キャビティ部内に半導体素子が、複数重ねられて搭載される半導体パッケージ。
[キャビティ層の作製]
図3に示すように、キャビティ材7として、両面に厚さ12μmの銅箔を張合わせた厚さ0.2mmのエポキシ樹脂ガラス布銅張積層板であるMCL−E679F(日立化成工業株式会社製、商品名)を準備した。NCドリルマシンであるMARK−100(日立精工株式会社製、商品名)によって、ガイド孔(図示しない。)と貫通孔A24を孔明けした。
図4に示すように、ベース材a28として、両面に厚さ12μmの銅箔を張合わせた厚さ0.06mmのエポキシ樹脂ガラス布銅張積層板であるMCL−E679F(日立化成工業株式会社製、商品名)にNCドリルマシンであるMARK−100(日立精工株式会社製、商品名)によって、貫通孔B39を明けた。
次に、この貫通孔B39のデスミア処理を過マンガン酸ナトリウム水溶液に温度85℃で6分間の条件で行い、無電解銅めっきであるCUST201(日立化成工業株式会社製、商品名)、硫酸銅10g/L、EDTA40g/L、ホルマリン10ml/L、pH12.2)に温度24℃、時間30分の条件で、貫通孔B39内を含むベース材a28の全面に0.5μmの下地銅めっきを行った。次に、硫酸銅めっきで温度30℃、電流密度1.5A/dm2、時間60分の条件で、貫通孔B39内を含むベース材a28の全面に、めっき厚20μmの電気銅めっき41を形成した。
次に、図5に示すように、キャビティ層5の接着剤8を仮付けした面と、ベース層6の感光性樹脂層10(ソルダーレジスト23)を形成した面が向き合うように重ね合わせ、真空プレスを用いて、圧力3MPa、温度175℃、保持時間1.5時間の条件で加圧加熱して積層一体化し、半導体素子搭載用パッケージ基板1とした。このとき、キャビティ層5に設けられた貫通孔A24が、ベース層6に設けられた接続パッド11によって塞がれるように積層され、接続パッド11を底面とした有底ビア13が、キャビティ層5に形成される。
次に、図5に示すように、半導体素子2を、半導体素子搭載用パッケージ基板1のキャビティ部9内に、ダイボンディングフィルム(図示しない。)を用いて固定した後、この半導体素子2の上に、もう一つの半導体素子2をダイボンドフィルムを用いて固定した。その後、上段及び下段の半導体素子2と半導体素子搭載用パッケージ基板1のワイヤボンド端子12とをボンディングワイヤ4で接続した。このとき、ボンディングワイヤ4を含む上段の半導体素子2の最上部は、半導体素子搭載用パッケージ基板1の接続端子A14と同等以下の高さであった。
次に、接続端子A14にはんだペーストを印刷し、図6に示すように、上記実施例の半導体パッケージ36をボトムパッケージ35として使用し、トップパッケージ34の接続端子と位置合わせした後、リフローによって半導体パッケージ同士を接合した。このとき、半導体素子搭載用パッケージ基板1のキャビティ部9内に封止剤3のほぼ全体が収納され、ほとんど飛び出していないので、半導体パッケージ同士の接合のためのはんだボール径は、封止剤3の高さを考慮する必要がない。このため、はんだボール径はφ0.3mm以下で接合が可能であった。この結果、ボトムパッケージ35の封止剤3の最上部が、接続端子A14の上に設けられたはんだボール(φ0.3mm)の1/3以下の高さとなる状態で(即ち端子間距離44の1/3以下の高さである0.1mm以下程度で)、トップパッケージ34と接合することが可能であった。
[キャビティ層の作製]
キャビティ材7として、実施例1のキャビティ材7より厚い、厚さ0.3mmのエポキシ樹脂ガラス布銅張積層板であるMCL−E679F(日立化成工業株式会社製、商品名)を用いた以外は、実施例1と同様にしてキャビティ材を作製した。
実施例1と同様に作製した。
半導体素子搭載用パッケージ基板1の有底ビア13が、実施例よりアスペクト比が大きい(穴径φ約0.2mm、深さ約0.35mm)こと以外は、実施例1と同様である。
[キャビティ層の作製]
キャビティ材7として、実施例1のキャビティ材7より厚い、厚さ0.4mmのエポキシ樹脂ガラス布銅張積層板であるMCL−E679F(日立化成工業株式会社製、商品名)を用いた以外は、実施例1と同様にしてキャビティ材を作成した。
実施例1と同様に作製した。
半導体素子搭載用パッケージ基板1の有底ビア13が、実施例1よりアスペクト比が大きい(穴径φ約0.2mm、深さ約0.45mm)こと以外は、実施例1と同様である。
[キャビティ層の作製]
キャビティ材7として、実施例1のキャビティ材7より厚い、厚さ0.5mmのエポキシ樹脂ガラス布銅張積層板であるMCL−E679F(日立化成工業株式会社製、商品名)を用いた以外は、実施例1と同様にしてキャビティ材を作成した。
実施例1と同様に作製した。
半導体素子搭載用パッケージ基板1の有底ビア13が、実施例1よりアスペクト比が大きい(穴径φ約0.2mm、深さ約0.55mm)こと以外は、実施例1と同様である。
[キャビティ層の作製]
実施例1と同様にしてキャビティ層5を作成した。
実施例1と同様にしてベース層6を作製した
層間接続31を形成する際に、有底ビア13内にフィルドビアめっきを行ったこと以外は、実施例1と同様である。半導体素子搭載用パッケージ基板1の有底ビア13は穴径φ約0.2mm、深さ約0.25mmであり、実施例1と同様であるが、フィルドビアめっきでは、十分に有底ビア13内にめっきが完全には充填されなかった。このため、有底ビア13の直上には接続端子A14が形成できなかった。
[キャビティ層の作製]
実施例1と同様にしてキャビティ層5を作成した。
実施例1と同様にしてベース層6を作製した。
層間接続31を形成する際に、有底ビア13内にめっきによる金属被覆18のみを行い、導電樹脂17を充填しなかった。また、このため、有底ビア13の直上ではない位置に接続端子A14を形成したこと以外は、実施例1と同様である。
[キャビティ層の作製]
実施例1と同様にしてキャビティ層5を作成した。
実施例1と同様にしてベース層6を作製した。
層間接続31を形成する際に、有底ビア13内にめっきによる金属被覆18を形成しないで、導電樹脂17の充填のみを行ったこと以外は、実施例1と同様である。
有底ビア13の断面を、光学顕微鏡で観察し、導電樹脂17やめっきが、有底ビア13の底部から入り口まで、隙間なく充填されている場合を合格(○)とした。
各実施例及び比較例で作製した導体素子搭載用パッケージ基板1を使用して、−55〜125℃の冷熱サイクル試験(それぞれ15分)を行い、100サイクルごとに有底ビア13の層間接続31を通した接続抵抗を測定し、1000サイクル後の接続不良の有無を確認した。接続抵抗が、初期値に比べて10%以上増加したものを不合格(×)とした。
Claims (8)
- キャビティ材とエラストマー材である接着剤とを備え、これらを貫通する開口及び貫通孔を有するキャビティ層と、前記接着剤を介して前記キャビティ層に積層されたベース層と、前記開口によって形成されたキャビティ部と、前記貫通孔によって形成されたキャビティ材と接着剤とを貫通する有底ビアと、を有する半導体素子搭載用パッケージ基板において、
前記キャビティ層のキャビティ材と接着剤とを貫通する有底ビアに、前記ベース層上の接続パッドと前記キャビティ層上の接続端子Aとを接続する層間接続が設けられ、
この層間接続が、前記キャビティ層の有底ビア内の前記接続パッド及び接着剤を含む内壁にめっきにより形成された金属被覆を有し、熱硬化性の導電樹脂が充填され、硬化されたものである半導体素子搭載用パッケージ基板。 - 請求項1において、
キャビティ層の層間接続が、
ベース層のキャビティ層側の面に設けられた接続パッドと、
この接続パッドを底面として前記キャビティ層に形成された有底ビアと、
この有底ビア内に充填された導電樹脂と、
この導電樹脂上に設けられた接続端子Aにより形成される半導体素子搭載用パッケージ基板。 - 請求項1又は2において、
ベース層のキャビティ層と反対側の面に接続端子Bが設けられ、
前記接続端子Aは接続端子Bよりもサイズ及びピッチが小さい半導体素子搭載用パッケージ基板。 - キャビティ材とエラストマー材である接着剤とを備えるキャビティ層に前記キャビティ材と接着剤とを貫通する開口と貫通孔を形成する工程と、前記キャビティ層に積層するベース層の一方の面に接続パッドを形成する工程と、前記貫通孔が接続パッドに塞がれて前記キャビティ材と接着剤とを貫通する有底ビアを形成するように、前記接着剤を介して前記キャビティ層とベース層とを積層する工程と、前記有底ビアに熱硬化性の導電樹脂を充填し硬化する工程と、前記導電樹脂上に接続端子Aを形成する工程と、を有し、
前記有底ビアに導電樹脂を充填する前に、前記有底ビア内の前記接続パッド及び接着剤を含む内壁にめっき層を形成する半導体素子搭載用パッケージ基板の製造方法。 - キャビティ部を有する半導体素子搭載用パッケージ基板と、前記キャビティ部内に搭載された半導体素子と、この半導体素子を封止する封止剤と、前記半導体素子搭載用パッケージ基板の一方の面に形成された接続端子Aと、他方の面に形成された接続端子Bを有する半導体パッケージにおいて、
前記キャビティ部が、キャビティ材とエラストマー材である接着剤とを備え、これらを貫通する開口及び貫通孔を有するキャビティ層と、前記接着剤を介して前記キャビティ層に積層されたベース層とによって形成され、
前記キャビティ層に前記ベース層上の接続パッドと前記キャビティ層上の接続端子Aとを接続する層間接続が設けられ、
この層間接続が導電樹脂により形成される半導体パッケージであって、
前記キャビティ層の層間接続が、
ベース層のキャビティ層側の面に設けられた接続パッドと、
この接続パッドを底面として前記キャビティ層のキャビティ材と接着剤とを貫通するように形成された有底ビアと、
この有底ビア内の前記接続パッド及び接着剤を含む内壁に形成された金属被覆と、
前記有底ビア内に充填され硬化された熱硬化性の導電樹脂と、
この導電樹脂上に設けられた接続端子Aにより形成される半導体パッケージ。 - 請求項5において、
前記封止剤の最上部が、前記半導体素子搭載用パッケージ基板の接続端子Aと同等以下の高さである半導体パッケージ。 - 請求項5又は6において、
接続端子Aが他の半導体素子搭載用パッケージ基板の接続端子と接続され、接続端子Bよりもサイズ及びピッチが小さい半導体パッケージ。 - 請求項5から7の何れかにおいて、
キャビティ部内に半導体素子が、複数重ねられて搭載される半導体パッケージ。
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