Patent ID: 6309945
Filing Date: 2001-10-30
Classification: H01L,Y10S,Y10T

Abstract:
A process for producing a semiconductor substrate, comprising the steps of:(a) providing a first substrate comprising a monocrystalline semiconductor having a porous monocrystalline semiconductor layer, the porous monocrystalline semiconductor layer having pores with inside walls;(b) forming a protective film on the inside walls of the pores of the porous monocrystalline semiconductor layer and on a surface of the porous monocrystalline semiconductor layer;(c) removing the protective film formed on the surface of the porous monocrystalline semiconductor layer while retaining the protective film formed on the inside walls of the pores of the porous monocrystalline semiconductor layer,(d) forming a non-porous monocrystalline semiconductor layer on the porous monocrystalline semiconductor layer by epitaxial growth;(e) bonding the first substrate to a second substrate with an insulating layer therebetween to obtain a multi-layer structure member such that the non-porous monocrystalline semiconductor layer is positioned inside of the multi-layer structure member; and(f) removing the porous monocrystalline semiconductor layer from the multi-layer structure member by chemical etching.