Patent ID: 7510915

Claim:
A method of fabricating a semiconductor device comprising: forming a first insulator over a substrate wherein a first region of the first insulator has a first thickness and wherein a second region of the first insulator adjacent to the first region has a second thickness larger than the first thickness; forming a second insulator comprising silicon oxide covering the first insulator; forming a semiconductor film over the second insulator wherein a first region of the semiconductor film is provided over the first region of the first insulator and wherein a second region of the semiconductor film is provided over the second region of the first insulator; performing an irradiation of a laser beam to the semiconductor film; and patterning the semiconductor film so that a channel region is provided in the patterned semiconductor film and over the second region of the first insulator, wherein a crystal grows toward the second region of the semiconductor film by the irradiation of the laser beam to form the crystal in the second region of the semiconductor film.