Patent ID: 6258638
Filing Date: 2001-07-10
Classification: H01L

Abstract:
A method of manufacturing a thin film transistor, comprisingforming a thin semiconductor film on an insulator substrate whose at least one surface is of an insulator;forming a first gate insulator film on said thin semiconductor filmetching said first gate insulating film in an at least one direction along a prospective gate electrode of the thin film transistor transverse of said gate insulating film, thereby leaving a remaining portion of said first gate insulating film having a width smaller than the width of a prospective channel, source or drain to be formed within the thin film transistor;forming a second gate insulating film covering said first gate insulating film and said thin semiconductor film;forming said gate electrode on said second gate insulating film;wherein a combined thickness of said first and second gate insulating films at a central region thereof above said thin semiconductor film, is larger than the combined thickness of said first and second gate insulating films at opposite end regions, thereof in a direction perpendicular to a source-drain direction in which the source and the drain are disposed on the substrate, the source-drain direction being perpendicular to a direction in which the gate electrode is disposed on the substrate.