Patent ID: 7384832
Filing Date: 2008-06-10
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming an amorphous semiconductor film over a substrate; irradiating the amorphous semiconductor film with a first laser beam to form a first crystalline semiconductor film; irradiating the first crystalline semiconductor film with a second laser beam to form a second crystalline semiconductor film; introducing an impurity into the second crystalline semiconductor film to form a source region and a drain region of a thin film transistor; and activating the source region and the drain region, wherein the first laser beam has a wavelength of 126 to 370 nm, wherein the second laser beam has a wavelength of 370 to 650 nm, wherein the second crystalline semiconductor film is used as at least a channel forming region of the thin film transistor, and wherein a portion of the amorphous semiconductor film, which becomes the entire channel forming region, is irradiated with both the first laser beam and the second laser beam.