JP7198479B2 - 半導体素子接合構造、半導体素子接合構造の生成方法及び導電性接合剤 - Google Patents
半導体素子接合構造、半導体素子接合構造の生成方法及び導電性接合剤 Download PDFInfo
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- JP7198479B2 JP7198479B2 JP2018163838A JP2018163838A JP7198479B2 JP 7198479 B2 JP7198479 B2 JP 7198479B2 JP 2018163838 A JP2018163838 A JP 2018163838A JP 2018163838 A JP2018163838 A JP 2018163838A JP 7198479 B2 JP7198479 B2 JP 7198479B2
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Description
本実施形態に係る半導体素子接合構造について、図1ないし図3を用いて説明する。本実施形態に係る半導体素子接合構造は、硬度、融点が比較的低く、粒径がマイクロサイズの第1の金属粒子を面心立方の結晶構造を持つ第2の金属で接着固着したものである。比較的硬度、融点が低い第1の金属として、例えば、アルミニウム(Al)、銀(Ag)、亜鉛(Zn)、銅(Cu)があり、粒径をマイクロサイズとするこれらの第1の金属の金属粒子を半導体素子と当該半導体素子に接合する被接合体との間に複数介在させ、第1の金属の金属粒子を面心立方の結晶構造を持つ、比較的硬度、融点が高い第2の金属で固着接合した構造である。
AlやAgのマイクロサイズの第1の金属の金属粒子5は、ナノサイズの場合と比較して酸化の程度が抑制され、またAgはマイクロサイズの場合に、マイグレーションの懸念も軽減される。
2 基板
3 半導体チップ
3a Al電極
4 接合層
5 金属粒子
Claims (8)
- 第1の金属の金属粒子を第2の金属で固着接合した半導体素子接合層を有する半導体素子接合構造であって、
前記第1の金属は、前記第2の金属よりも硬度が低く、融点が当該第2の金属と同等以下であり、且つ、粒径がマイクロサイズであり、前記第1の金属の金属粒子は半導体素子と当該半導体素子に接合する被接合体との間に複数介在しており、前記第1の金属の金属粒子は前記第2の金属で固着接合され、
前記第1の金属がアルミニウム(Al)又はアルミニウム合金(Al合金)であり、前記第2の金属がニッケル(Ni)であり、
前記金属粒子の容積率が50%以上、90%以下であることを特徴とする半導体素子接合構造。 - 請求項1に記載の半導体素子接合構造において、
前記第1の金属の金属粒子の粒径が0.5μmより大きく、500μm以下である半導体素子接合構造。 - 請求項1又は2に記載の半導体素子接合構造において、
当該半導体素子接合層の厚みが3μm以上、800μm以下の範囲である半導体素子接合構造。 - 請求項1ないし3のいずれかに記載の半導体素子接合構造の生成方法であって、
前記第1の金属の金属粒子を前記半導体素子と前記被接合体との間に複数介在させ、前記第1の金属の金属粒子間に生じる隙間にめっき液を流通し、めっき処理により前記第2の金属を析出させて前記第1の金属の金属粒子を固着接合する半導体素子接合構造の生成方法。 - 請求項1ないし3のいずれかに記載の半導体素子接合構造の生成方法であって、
粒径が5nm以上、500nm以下で、且つ、前記第1の金属の金属粒子の粒径の1/10以下である前記第2の金属を含む前記第2の金属の金属粒子と前記第1の金属の金属粒子との混合体を200℃以上で加熱し、前記第2の金属の金属粒子の焼結体で前記第1の金属の金属粒子を固着接合する半導体素子接合構造の生成方法。 - ナノサイズのニッケル(Ni)を含むニッケル(Ni)粒子と、前記ニッケル(Ni)よりも硬度が低く、粒径がマイクロサイズの金属粒子との混合体からなり、前記金属粒子の容積率が50%以上、90%以下であることを特徴とする導電性接合剤。
- ナノサイズの銅(Cu)を含む銅(Cu)粒子と、前記銅(Cu)よりも硬度が低く、粒径がマイクロサイズの金属粒子との混合体からなり、前記金属粒子の容積率が50%以上、90%以下であることを特徴とする導電性接合剤。
- 請求項6又は7に記載の導電性接合剤において、
マイクロサイズの前記金属粒子がアルミニウム(Al)又はアルミニウム合金(Al合金)であることを特徴とする導電性接合剤。
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