Patent ID: 7172929
Filing Date: 2007-02-06
Classification: G02B,H01L

Abstract:
1. A method of manufacturing a semiconductor thin film, said method comprising the steps of: forming an amorphous silicon film over a substrate having a dielectric surface; selectively forming a mask film over said amorphous silicon film; holding a metallic element for acceleration of crystallization of said amorphous silicon film adjacent to said amorphous silicon film; altering, by a first heat treatment, at least part of said amorphous silicon film to a crystalline silicon film; removing said mask film; performing a second heat treatment in an atmosphere containing a halogen to form a thermal oxide film containing the halogen on at least part of said amorphous silicon film and said crystalline silicon film while allowing said crystalline silicon film to convert into a corresponding mono-domain region; and removing said thermal oxide film, wherein surface height variations of the mono-domain region are within plus or minus 3 nm.