Patent ID: 8455331
Filing Date: 2013-06-04
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: adding an impurity element imparting one conductivity type to a semiconductor substrate from a surface of the semiconductor substrate, to form an impurity region of a field-effect transistor; irradiating the surface of the semiconductor substrate with ions, to form an embrittlement layer in the semiconductor substrate before adding the impurity element; forming a first insulating layer over the surface of the semiconductor substrate; forming a silicon nitride film over the first insulating layer; forming a mask over a part of the silicon nitride film; etching the silicon nitride film and the first insulating layer using the mask so that a second insulating layer and a silicon nitride layer are formed; removing the mask; etching the semiconductor substrate using the silicon nitride layer as a mask; removing the silicon nitride layer; bonding a supporting substrate and the etched semiconductor substrate with the second insulating layer interposed therebetween; performing a first heat treatment; after the first heat treatment, performing a second heat treatment for generating a crack in the embrittlement layer and separating the etched semiconductor substrate at the embrittlement layer to form a semiconductor layer including the impurity region over the supporting substrate; and forming the field-effect transistor using at least a part of the impurity region of the semiconductor layer as a channel formation region, wherein the semiconductor layer is etched deeper than a depth of the embrittlement layer.