Patent ID: 7935584

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming a first insulating film over a substrate; forming a semiconductor film over the insulating film; forming a second insulating film over the semiconductor film; after forming the second insulating film, irradiating the semiconductor film with a continuous wave laser beam through the second insulating film; melting and crystallizing the semiconductor film to form a crystalline semiconductor film having a crystal grain with a width of greater than or equal to 0.5 μm and less than or equal to 10 μm; and removing the second insulating film; patterning the crystallized semiconductor film to form at least one semiconductor island; forming a third insulating film over the semiconductor island; and forming a gate electrode over the semiconductor island with the third insulating film interposed therebetween, wherein an energy distribution of the laser beam is a Gaussian distribution; and wherein the semiconductor film is irradiated with the laser beam for a period of greater than or equal to 5 microseconds and less than or equal to 100 microseconds per region.