Patent ID: 6489222
Filing Date: 2002-12-03
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming a base insulating film on a substrate; forming a first semiconductor film on said base insulating film; forming a first insulating film on said first semiconductor film; partially etching said first insulating film into a first insulating layer having a polygonal shape, wherein an angle of at least one vertex of said polygonal shape is less than 60Â°; forming a second semiconductor film covering said first insulating layer; forming a second insulating film covering said second semiconductor film; etching a portion of said second insulating film overlapping with said first insulating layer; irradiating a laser beam from a top surface side of said substrate, or from both of said top surface side and a bottom surface side of said substrate to obtain a crystalline semiconductor film from said first semiconductor film and said second semiconductor film; and forming a thin film transistor by using said crystalline semiconductor film in contact with said second insulating layer as a channel forming region.