Patent ID: 6916693

Claim:
A method of manufacturing a semiconductor device, comprising: introducing, into an amorphous semiconductor film, a metallic element for promoting crystallization of the amorphous semiconductor film; partially crystallizing the amorphous semiconductor film in accordance with heat treatment, to form a first crystalline semiconductor film possessing a plurality of amorphous regions; and irradiating a laser beam on the first crystalline semiconductor film, to form a second crystalline semiconductor film; and adding an impurity element to the second crystalline semiconductor film after the irradiation of the laser beam to form a source region and a drain region in the second crystalline semiconductor film, wherein: the surface area of each of the plurality of amorphous regions in a region of the first crystalline semiconductor film which becomes an active layer of a TFT is equal to or less than 10 μm 2 and among the plurality of amorphous regions, amorphous region has a surface area equal to or greater than 0.3 μm 2 , and wherein a total surface area of the plurality of amorphous regions contained within the region of the first crystalline semiconductor film which becomes the active layer of the TFT is from 1.0% to 8.0% with respect to the surface area of the active layer of the TFT.