Patent ID: 6323069
Filing Date: 2001-11-27
Classification: H01L

Abstract:
A method of manufacturing a thin film transistor comprising the steps of:forming a gate electrode on an insulating surface of a substrate;forming a gate insulating film comprising silicon nitride over said gate electrode;forming a semiconductor film comprising polycrystalline silicon over said gate electrode with the gate insulating film interposed therebetween;forming a mask comprising an insulating film on a portion of said semiconductor film and a photoresist film on said insulating film, said portion corresponding to a channel region of said thin film transistor wherein said insulating film comprises silicon nitride;performing an ion doping of an impurity by using an acceleration voltage for selectively introducing impurity ions into said semiconductor film except for the portion covered by said mask to form impurity regions;removing only said photoresist film while said insulating film remains on said portion of the semiconductor film;irradiating said impurity regions with light from an upper portion of the insulating film for crystallizing the impurity regions wherein said impurity regions are exposed during said ion doping and said irradiation of light,wherein said channel region is prevented from being directly exposed to said light by said insulating film.