Patent ID: 6987320

Claim:
A pressure-welded semiconductor device comprising: at least one semiconductor element including a first main surface having disposed thereon at least one element-side electrode and a second main surface being opposite from the first main surface and having disposed thereon at least one element-side electrode; a casing including a first casing plate and a second casing plate disposed so as to face each other, with a first casing-side electrode being disposed on an opposing surface of the first casing plate and a second casing-side electrode being disposed on an opposing surface of the second casing plate, the at least one semiconductor element being incorporated inside the casing so that the first casing-side electrode and the at least one element-side electrode disposed on the first main surface are pressure-welded and the second casing-side electrode and the at least one element-side electrode disposed on the second main surface are pressure-welded; and a buffer conductive layer including conductive carbons disposed at at least one of a pressure-welded portion between the first casing-side electrode and the element-side electrode disposed on the first main surface and a pressure-welded portion between the second casing-side electrode and the element-side electrode disposed on the second main surface.