Patent ID: 7906430

Claim:
A method of manufacturing a semiconductor device, comprising: providing a semiconductor substrate comprising a first insulation film formed on a front surface of the semiconductor substrate and a pad electrode formed on the first insulation film; forming from a back surface of the semiconductor substrate a via hole to penetrate the semiconductor substrate in a position of the semiconductor substrate corresponding to the pad electrode; forming a second insulation film to cover a sidewall of the via hole and the back surface; etching the second insulation film so as to expose at least part of the pad electrode; forming a metal layer in the via hole so as to be in contact with the exposed pad electrode and on the back surface covered by the second insulation film; patterning the metal layer to form a penetrating electrode disposed in the via hole and connected with the pad electrode and a peeling prevention layer disposed on the second insulation film so as to be electrically isolated; forming a protection layer covering the penetrating electrode, the second insulation film and the peeling prevention layer; and cutting the semiconductor substrate covered by the protection layer so as to produce a semiconductor device comprising the penetrating electrode and the peeling prevention layer, wherein the peeling prevention layer is not electrically connected to any device element formed on the front or back surface of the semiconductor substrate after the cutting of the semiconductor substrate.