Patent ID: 8592996

Claim:
A semiconductor device comprising a substrate having a metal face on a side for mounting a semiconductor element made of Si or SiC, wherein the semiconductor element has a circuit on its main face and the rear face is bonded to the substrate via a sintered silver bonding layer made from fine particles and an oxide layer whose main ingredient is SiO 2 , the SiO 2 layer being formed between the rear face of the semiconductor element and the sintered silver bonding layer, wherein the sintered silver bonding layer consists of sintered silver metal in which the crystal grains of the silver metal are closely contacting each other, wherein the sintered silver bonding layer and the SiO 2 layer, and the sintered silver bonding layer and the metal face of the substrate are, respectively, in closely contact with each other, wherein the SiO 2 layer is an activated oxide layer, and wherein the sintered silver bonding layer is bonded to the activated oxide layer.