Patent ID: 6639244
Filing Date: 2003-10-28
Classification: G02F,H01L

Abstract:
A semiconductor device comprising a pixel thin film transistor and a driver circuit for driving said pixel thin film transistor both formed over a same substrate, said semiconductor device comprising:a semiconductor layer over said substrate, said semiconductor layer having at least a pair of impurity regions, a channel formation region between said pair of impurity regions, and a capacitor formation portion, wherein said capacitor formation portion contains a catalytic element for promoting a crystallization of said semiconductor layer at a concentration of 1Ã—1019 atoms/cm3 or more; a first insulating film adjacent to said channel formation region; a second insulating film adjacent to said capacitor formation portion of said semiconductor layer, wherein said second insulating film is thinner than said first insulating film; a gate electrode adjacent to said channel formation region with said first insulating film interposed therebetween; an upper capacitor electrode to form a storage capacitor adjacent to said capacitor formation portion of said semiconductor layer with said second insulating film interposed therebetween; a third insulating film over said storage capacitor and said gate electrode; an electrode on said third insulating film; a fourth insulating film over said third insulating film and said electrode; a black mask on said fourth insulating film; a fifth insulating film over said fourth insulating film and said black mask; and a pixel electrode on said fifth insulating film, wherein said pixel electrode is electrically connected to one of said pair of impurity regions.