Patent ID: 8685854

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) forming a blind hole in a silicon wafer from a device main surface thereof toward the rear surface thereof; (b) forming a silicon nitride film over the device main surface of the silicon wafer; (c) forming, by CVD, a barrier metal film over: the silicon nitride film which is over the device main surface, a periphery of the silicon wafer at the device main surface side, and an inner surface of the blind hole; (d) forming, by CVD, a tungsten film over: the barrier metal film which is over the device main surface, except in the vicinity of the outer edge of the barrier metal film, and the barrier metal film inside the blind hole so as to be buried into the blind hole; (e) removing the barrier metal film and the tungsten film outside the blind hole at the device main surface side of the silicon wafer; and (f) subjecting the rear surface side of the silicon wafer to film-thinning treatment, thereby making the blind hole into a through via; wherein the barrier metal film is exposed in the periphery of the silicon wafer at the end of step (d).