Patent ID: 8394686
Filing Date: 2013-03-12
Classification: H01L,Y02C,Y02P

Abstract:
1. A method comprising: dry etching an amorphous silicon film that is formed on a silicon nitride film, by parallel-plate type dry etching using an etching gas including at least COF wherein the dry etching achieves an etching rate of the silicon nitride film that is lower than an etching rate of the amorphous silicon film; wherein the amorphous silicon film comprises an intrinsic amorphous silicon film and an n-type amorphous silicon film formed on the intrinsic amorphous silicon film; wherein the method is performed in a process of manufacturing a channel-protection-film type thin film transistor of a reverse-staggered type, in which a silicon thin film is formed on a gate insulating film made of the silicon nitride film, and ohmic contact layers are formed on both sides of an upper surface of the silicon thin film; wherein the n-type amorphous silicon film and the intrinsic amorphous silicon film are sequentially dry etched to form the ohmic contact layers and the silicon thin film; wherein the etching gas is a mixed gas including COF wherein the amorphous silicon film is etched while using the silicon nitride film as a stopper.