JP2017059636A - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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Abstract
【解決手段】互いに対向する第1及び第2の主面を持つ半導体基板1の第1の主面に第1の主電極9を形成する。半導体基板1の第2の主面に第2の主電極13を形成する。第1及び第2の主電極9、13の表面を活性化する表面活性化処理を行う。第1及び第2の主電極9、13の表面を清浄化する表面清浄化処理を行う。表面活性化処理及び表面清浄化処理の後に、第1及び第2の主電極9、13上にそれぞれ2%以上の結晶性Niを含む第1及び第2のNi膜14、15を湿式成膜法により同時に形成する。
【選択図】図6
Description
図1は、本発明の実施の形態1に係る半導体装置の製造方法のフローチャートである。図2〜図6は、本発明の実施の形態1に係る半導体装置の製造工程を示す断面図である。本実施の形態では、表裏導通型の半導体装置の一例としてトレンチ型IGBT(絶縁ゲート型バイポーラトランジスタ)の表裏面にはんだ付け用の電極を形成する。
図10は、本発明の実施の形態2に係る半導体装置の製造方法のフローチャートである。図11は、本発明の実施の形態2に係る半導体装置の製造工程を示す断面図である。まず、実施の形態1と同様にステップS1〜S7を行う。次に、図11に示すように、無電解Niめっき膜14,15上にそれぞれ無電解Auめっき膜16,17を置換型の無電解Auめっきにより形成する(ステップS8)。置換型の無電解Auめっきは、無電解Niめっき膜14,15の上に施すものであり、めっき液中に含まれる錯化剤の作用によってNiとAuが置換する作用を利用したものである。置換型であるためNiの表面がAuで被覆されてしまうと反応が停止する。従って、厚く成膜するのは難しく、多くても0.1μm、一般的には0.05μm程度の成膜をするものが多い。ただし、はんだ付け用として利用する場合は、Auめっきの厚さは上述した値でも少なすぎることはない。
図16は、本発明の実施の形態3に係る半導体装置の製造方法のフローチャートである。図17は、本発明の実施の形態3に係る半導体装置の製造工程を示す断面図である。まず、実施の形態1,2と同様にステップS1〜S7を行う。次に、図17に示すように、無電解Niめっき膜14,15上にそれぞれ無電解Pdめっき膜21,22を無電解Pdめっきにより形成する(ステップS9)。次に、無電解Pdめっき膜21,22上にそれぞれ無電解Auめっき膜16,17を無電解Auめっきにより形成する(ステップS10)。
Claims (14)
- 互いに対向する第1及び第2の主面を持つ半導体基板の前記第1の主面に第1の主電極を形成する工程と、
前記半導体基板の前記第2の主面に第2の主電極を形成する工程と、
前記第1及び第2の主電極の表面を活性化する表面活性化処理を行う工程と、
前記第1及び第2の主電極の表面を清浄化する表面清浄化処理を行う工程と、
前記表面活性化処理及び前記表面清浄化処理の後に、前記第1及び第2の主電極上にそれぞれ2%以上の結晶性Niを含む第1及び第2のNi膜を湿式成膜法により同時に形成する工程とを備えることを特徴とする半導体装置の製造方法。 - 前記第1及び第2のNi膜上にそれぞれ第1及び第2のAu膜を湿式成膜法により形成する工程を更に備えることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記第1及び第2のNi膜上にそれぞれ第1及び第2のPd膜を湿式成膜法により形成する工程と、
前記第1及び第2のPd膜上にそれぞれ第1及び第2のAu膜を湿式成膜法により形成する工程とを備えることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記表面活性化処理としてプラズマクリーニングを行うことを特徴とする請求項1〜3の何れか1項に記載の半導体装置の製造方法。
- 前記表面清浄化処理としてジンケート処理を行うことを特徴とする請求項1〜4の何れか1項に記載の半導体装置の製造方法。
- 前記ジンケート処理を少なくとも2回実施することを特徴とする請求項5に記載の半導体装置の製造方法。
- 前記第1及び第2のNi膜を形成するための前記湿式成膜法は無電解Niめっきであることを特徴とする請求項1〜6の何れか1項に記載の半導体装置の製造方法。
- 前記第1及び第2のAu膜を形成するための前記湿式成膜法は無電解Auめっきであることを特徴とする請求項2又は3に記載の半導体装置の製造方法。
- 前記第1及び第2のPd膜を形成するための前記湿式成膜法は無電解Pdめっきであることを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記第1及び第2のNi膜を形成する前に、前記半導体基板の前記第1の主面において前記第1の主電極の周囲を保護膜で囲繞する工程を更に備えることを特徴とする請求項1〜9の何れか1項に記載の半導体装置の製造方法。
- 前記第1及び2の主電極の少なくとも一方はAl合金電極であることを特徴とする請求項1〜10の何れか1項に記載の半導体装置の製造方法。
- 前記第1及び2の主電極の少なくとも一方は、バリアメタルと、前記バリアメタル上に設けられたAl合金電極とを有することを特徴とする請求項1〜10の何れか1項に記載の半導体装置の製造方法。
- 前記第1及び2の主電極の少なくとも一方は、Al合金電極と、前記Al合金電極上に設けられたバリアメタルとを有することを特徴とする請求項5又は6に記載の半導体装置の製造方法。
- 前記半導体基板はSi又はSiCであることを特徴とする請求項1〜13の何れか1項に記載の半導体装置の製造方法。
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