Patent ID: 7276429

Claim:
A method of production of an ultra-thin semiconductor device comprising the steps of: forming a base comprised of a support substrate on which a second porous semiconductor peeling layer, a second single crystalline semiconductor layer, an insulating layer, and a first single crystalline semiconductor layer are stacked and forming a semiconductor device unit and projecting connection electrodes to be connected to the semiconductor device unit at said first single crystalline semiconductor layer; forming a score along a separation line for separation to an individual semiconductor device from said first single crystalline semiconductor layer side until at least said second porous semiconductor peeling layer of said base is reached; forming a resin protective film filling an interior of said score and covering the surface of said first single crystalline semiconductor layer; exposing said projecting connection electrodes at the surface by polishing one surface of the resin protective film; covering the resin protective film surface and said projecting connection electrode surfaces by a conductive protective tape free from residual; peeling off said support substrate using said second porous semiconductor peeling layer as an interface; and dicing from said second crystalline semiconductor layer side along said resin protective film filled in said score to separate an individual semiconductor device.