Patent ID: 7893439

Claim:
A semiconductor device comprising: a gate insulating film formed over an insulating substrate, the gate insulating film including a first silicon nitride film; a gate electrode over the gate insulating film; a second silicon nitride film over the gate electrode; a wiring formed over the second silicon nitride film, the wiring including copper; and a third silicon nitride film over the wiring, wherein each of the first silicon nitride film, the second silicon nitride film and the third silicon nitride film contains hydrogen with a concentration of 1×10 21 /cm 3 or less and has a characteristic of an etching rate of 10 nm/min or less with respect to mixed solution at a temperature of 20° C., containing an ammonium hydrogen fluoride (NH 4 HF 2 ) of 7.13% and an ammonium fluoride (NH 4 F) of 15.4%.