Patent ID: 6458637
Filing Date: 2002-10-01
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, said method comprising the steps of:forming a transistor on a semiconductor substrate; said transistor including: a first source region in the semiconductor substrate; a first drain region in the semiconductor substrate; a first channel region between the source and drain regions; a first gate electrode adjacent over at least the first channel region with a first gate insulating film interposed therebetween; forming a first interlayer insulating film having a leveled surface over the transistor; forming a second interlayer insulating film on the first interlayer insulating film; forming an amorphous semiconductor film over the second interlayer insulating film; crystallizing the amorphous semiconductor film to form a crystalline semiconductor film; forming a second gate insulating film adjacent to the crystalline semiconductor film; forming a second gate electrode adjacent to the crystalline semiconductor film with the second gate insulating film interposed therebetween; introducing an impurity into the crystalline semiconductor film to form at least a second source region, a second drain region and a second channel region between the second source and drain regions.