Patent ID: 8293558
Filing Date: 2012-10-23
Classification: H01L

Abstract:
1. A method for fabrication of a thin-film crystalline semiconductor substrate by releasing it from a semiconductor template through the use of a sacrificial porous semiconductor seed and release layer, the method comprising: forming a porous semiconductor layer on a semiconductor template measuring at least 200 mm×200 mm, said porous semiconductor layer substantially conformal to said semiconductor template; forming a thin-film crystalline semiconductor substrate on said porous semiconductor layer, said thin-film semiconductor substrate substantially conformal to said porous semiconductor layer; and selectively and chemically wet etching said porous semiconductor layer with a high-etch-selectivity wet etchant, said wet etchant solution comprising dilute TMAH or KOH or NaOH; releasing said thin-film semiconductor substrate as a free-standing, self-supporting semiconductor substrate from said semiconductor template via selective wet etching of said porous semiconductor layer.