JP5486848B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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Description
第1の半導体素子基板の表面に形成した凸形状の金属性導体バンプと第2の半導体素子基板の表面に形成した凸形状の金属性導体バンプとを互いに接合させる。その際、前記第1の半導体素子基板の表面に形成した第1の凸形状金属性導体バンプは、あらかじめその先端を尖らせておく。一方、前記第2の半導体素子基板の表面に形成した第2の凸形状金属性導体バンプはその頂部、側壁部、および本体部の少なくとも3種類の材質からなる複合構造とし、その本体部は軟性金属とする。さらに、先端の尖った前記第1の凸形状金属性導体バンプの先端部分が前記第2の凸形状金属性導体バンプの本体部分である軟性金属層に圧入された構造とする。このような構造、構成により、半導体チップを積層してなるチップ積層構造体が実現できる。
Claims (15)
- 第1の半導体素子基板と、
第2の半導体素子基板とを備え、
前記第1の半導体素子基板と、第2の半導体素子基板とを接合してなる半導体装置であって、
前記第1の半導体素子基板は、その表面に形成した金属性導体の第1のバンプを有し、
前記第2の半導体素子基板は、その表面に形成した金属性導体の第2のバンプを有し、
前記第2のバンプの本体部は頂部に酸化防止膜を備える軟性金属層であって、
前記第1のバンプが、前記第2のバンプの本体部である軟性金属層に前記酸化防止膜を備えた領域から圧入された構造であることを特徴とする半導体装置。 - 請求項1において、
前記第2のバンプの軟性金属層は、ブリュネル硬度が50MPa以下であることを特徴とする半導体装置。 - 請求項2において、
前記第2のバンプの軟性金属層は、In層であることを特徴とする半導体装置。 - 請求項3において、
前記In層の頂部にAg膜を備え、
前記Ag膜を備えた領域から、前記第1のバンプが前記第2のバンプに圧入されていることを特徴とする半導体装置。 - 請求項1または請求項4において、
前記第2のバンプの表面であり、前記酸化防止膜または前記Ag膜を設けていない位置
に、前記軟性金属層の酸化膜を備え、
前記第1の半導体素子基板と前記第2の半導体素子基板との間であり、前記酸化膜に接する位置に、樹脂を備えたことを特徴とする半導体装置。 - 請求項5において、
前記樹脂は、アンダーフィルであることを特徴とする半導体装置。 - 請求項1において、
前記第1のバンプの高さは、前記第2のバンプの高さの10%以上95%以下の範囲であることを特徴とする半導体装置。 - 請求項1において、
前記第1のバンプは、シェア硬度が50MPa以上であることを特徴とする半導体装置。 - 請求項8において、
前記第1のバンプは、Cuを主成分とすることを特徴とする半導体装置。 - 請求項1、請求項8または請求項9において、
前記第1のバンプは、先端付近の外表面が前記半導体基板の面と形成する角度が35〜55度であることを特徴とする半導体装置。 - 複数の基板と、
複数の前記基板の一主面に形成された第1のバンプと、
前記一主面の反対の面に形成された第2のバンプとを備え、
前記第1のバンプは、シェア硬度が50MPa以上であり、
前記第2のバンプは、頂部に酸化防止膜を備え、ブリュネル硬度が50MPa以下の軟性金属であり、
複数の前記基板を積層し、前記第1のバンプが、前記第2のバンプの本体部である軟性金属層に前記酸化防止膜を備えた領域から圧入された構造であることを特徴とする半導体素子基板。 - 請求項11において、
前記第1のバンプの主成分はCuであり、
前記第2のバンプの主成分はInであることを特徴とする半導体素子基板。 - 第1の半導体素子基板上に、第1のバンプを形成する工程と、
第2の半導体素子基板上に、軟性金属である第2のバンプを形成する工程と、
前記第1のバンプを、前記第2のバンプに、常温で圧入する工程とを有し、
前記第2のバンプを形成する工程は、
前記第2のバンプ本体を形成する工程と、
前記第2のバンプ本体上に、酸化防止膜を形成する工程と、
前記酸化防止膜を形成後、前記第2のバンプの表面を酸化させ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。 - 請求項13において、
前記圧入する工程では、前記第1のバンプを前記酸化防止膜を通じて前記第2のバンプに圧入することを特徴とする半導体装置の製造方法。 - 請求項14において、
前記圧入する工程の後に、前記第1の半導体素子基板と前記第2の半導体素子基板との間であり、前記第2のバンプの酸化した表面に接する位置に、アンダーフィルを形成する工程を有することを特徴とする半導体装置の製造方法。
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