Patent ID: 6124155
Filing Date: 2000-09-26
Classification: G02F,H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:forming a gate electrode on an insulating surface by using a first mask;forming a gate insulating film comprising silicon nitride on said gate electrode;forming a first semiconductor film comprising amorphous silicon over said gate electrode with said gate insulating film interposed therebetween;forming a second semiconductor film on said first semiconductor film, said second semiconductor film having a different conductivity type from said first semiconductor film;patterning said first and second semiconductor films by using a second mask;forming a conductive layer on the patterned second semiconductor film;patterning the conductive layer to form source and drain electrodes by using a third mask wherein a portion of the patterned second semiconductor film is exposed between said source and drain electrodes;etching the exposed portion of the second semiconductor film to form source and drain regions wherein a channel forming region is formed in said first semiconductor film between said source and drain regions.