Patent ID: 8273650
Filing Date: 2012-09-25
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of fabricating a thin film interface for internal light reflection and impurities isolation, comprising steps of: (a) obtaining an upgraded metallurgical grade silicon (UMG-Si) substrate having a purity ratio greater than 4N (99.99%); (b) obtaining a surface textured structure on a surface of said UMG-Si substrate through a method selected from a group consisting of a physical method and a chemical method; (c) coating a Ge metal thin layer directly on said surface textured structure of said UMG-Si substrate through a method and coating an amorphous silicon (a-Si) thin layer directly on said Ge metal thin layer through said method sequentially; and (d) processing an epitaxy through chemical vapor deposition (CVD) to obtain a high quality epitaxial silicon layer directly on said a-Si thin layer on said UMG-Si substrate, wherein said method in step (c) is selected from a group consisting of a physical method and a chemical method; wherein a SiGe metal compound (Si wherein an impurities aggregated area is obtained at an interface between said UMG-Si substrate and said SiGe metal compound thin film interface layer, wherein the impurities aggregated area interface between the UMG-Si substrate and the SiGe metal compound interface layer is defined by heterogeneous structures having mismatching crystal lattices.