Patent ID: 8338278

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming a semiconductor film over a substrate; forming an insulating film over the semiconductor film; forming a film over the insulating film, the film having a plurality of projections with a triangular cross-sectional shape on surface of the film; irradiating the semiconductor film with a laser beam applied from above the film to crystallize the semiconductor film; and processing the crystallized semiconductor film and the insulating film into an island-shaped semiconductor film and an island-shaped insulating film concurrently after the irradiating step, wherein a wavelength of the laser beam is in a range of from 400 nm to 565 nm, wherein a base of a triangular cross-section of at least one of the plurality of projections has a length that is in a range of from ⅓ of the wavelength of the laser beam to the wavelength of the laser beam, and wherein a height of one of the plurality of projections is in a range of from ⅓ of the wavelength of the laser beam to the wavelength of the laser beam.