Patent ID: 6391690
Filing Date: 2002-05-21
Classification: C23C,G02F,H01L

Abstract:
A fabrication process of a thin film semiconductor device having a semiconductor film as an active layer of a transistor, said semiconductor film being formed over a substrate, the fabrication process comprising:a first step of depositing a semiconductor film, in a reaction chamber at a pressure of not less than about 1.0 Torr and with an electrode separation of not less than about 17.8 mm, by plasma-enhanced chemical vapor deposition (PECVD) using a combined gas with a chemical specie containing elements of said semiconductor film as a source gas and argon (Ar) as another gas, said source gas having a concentration of not more than about 6.25% in said combined gas, said semiconductor film having at least two absorption peaks, a first absorption peak at about 2102Â±4 cmâˆ’1 and a second absorption peak at about 2084Â±4 cmâˆ’1, a strength of said first absorption peak being stronger than a strength of an absorption peak at about 2000Â±20 cmâˆ’1; and a second step of increasing a crystallinity of said semiconductor film.