Patent ID: 8609514
Filing Date: 2013-12-17
Classification: H01L,Y10S

Abstract:
1. A process for forming a thin film from a substrate comprising the steps of: (a) forming a first film on a surface of the substrate by epitaxial deposition, the first film doped by boron to form a layer of inclusions extending parallel to the surface of the substrate, wherein the layer of inclusions forms a gaseous compound trap zone and, subsequently, forming a second film doped by boron on the first film by epitaxial deposition, wherein the second film has a boron concentration that is less than the first film; (b) after step (a), implanting a dose of gaseous compounds into the gaseous compound trap zone, wherein the dose of gaseous compounds is sufficient to cause formation of micro-cavities in a fracture plane including the gaseous compound trap zone and along which the thin film can be separated from the remainder of the substrate, the gaseous compound trap zone substantially confining the gaseous compounds therein; (c) separating the thin film from the substrate along the fracture plane and thereafter recovering the thin film.