Patent ID: 8513534

Claim:
A semiconductor device comprising a wiring substrate including wiring layers on both sides of a ceramic insulated substrate, a semiconductor element connected to one of the sides of the wiring substrate, and a support connected to the other of the sides of the wiring substrate, wherein a bonding surface of the wiring layer bonded to the semiconductor element is comprised of Al, the semiconductor element and the wiring layer are bonded through a sintering layer comprised of Ag or Cu particles, and the sintering layer and the wiring layer are bonded to each other with an amorphous layer interposed therebetween, and wherein the amorphous layer consists of aluminum oxide, and the sintering layer and the amorphous layer are directly bonded to each other; wherein the sintering layer is formed by sintering a mixed material including metal oxide particles and either one of acetic acid particles and formic acid based particles, wherein the metal oxide particles are comprised of copper oxide or silver oxide, wherein the acetic acid particles are comprised of silver acetate or copper acetate, and wherein the formic acid particles are comprised of silver formate or copper formate.