Patent ID: 8043905

Claim:
A method of manufacturing a semiconductor device comprising: forming at least one patterned first crystalline semiconductor layer over a substrate by irradiating a first amorphous semiconductor layer with a first continuous wave laser beam to crystallize the first amorphous semiconductor layer while moving an irradiated region by the first continuous wave laser beam relative to the substrate; and forming at least one patterned second crystalline semiconductor layer on the patterned first crystalline semiconductor layer by irradiating a second amorphous semiconductor layer with a second continuous wave laser beam to crystallize the second amorphous semiconductor layer having a first region overlapped with the patterned first crystalline semiconductor layer and a second region which is not overlapped with the patterned first crystalline semiconductor layer while moving the second continuous wave laser beam relative to the substrate; wherein in irradiating the second amorphous semiconductor layer, an irradiated region of the second continuous wave laser beam is moved from the first region to the second region.