Patent ID: 6200837
Filing Date: 2001-03-13
Classification: H01L

Abstract:
A method of manufacturing a thin film transistor having a polysilicon layer as a channel layer, comprising the steps of:forming an amorphous silicon layer on an insulating layer;crystalizing the amorphous silicon layer to form a polysilicon layer, wherein the polysilicon layer has grain boundaries formed therein and a rough surface including first portions adjacent the grain boundaries and second portions remote from the grain boundaries;oxidizing the rough surface of the polysilicon layer to form an oxide layer, wherein the oxidizing step is performed so as to oxidize the first portions of the rough surface of the polysilicon layer at a rate faster than the rate at which the second portions of the rough surface of the polysilicon layer are oxidized such that the interface between the polysilicon layer and the oxide layer is substantially planar; andremoving the oxide layer to expose the polysilicon layer having a smooth surface.