Patent ID: 7700418
Filing Date: 2010-04-20
Classification: H01L

Abstract:
1. A method for production of a thin-film semiconductor device which comprises: a first step to form a gate electrode on a substrate; a second step to form a gate insulating film of silicon oxynitride on said substrate in such a way as to cover said gate electrode; a third step to form a semiconductor thin film on said gate insulating film; and a fourth step to perform heat treatment in an oxygen-containing oxidizing atmosphere for modification through oxygen binding with oxygen-deficient parts in said silicon oxynitride film constituting said gate insulating film, wherein the fourth step grows an additional film on the surface of said semiconductor thin film, and wherein the fourth step is followed by an additional step to form a source-drain by patterning from said additional film in a shape overlapping said gate electrode and by further patterning from a semiconductor thin film containing impurities, said source-drain being in contact with said semiconductor thin film and said patterning being performed at a position on said semiconductor thin film under which said gate electrode exists.