Patent ID: 7015079

Claim:
A method of manufacturing a semiconductor device, comprising: a first step of forming a semiconductor film having an amorphous structure on an insulating surface; a second step of adding a metallic element to the semiconductor film having an amorphous structure; a third step of heat-treating the semiconductor film having an amorphous structure to form a semiconductor film having a crystalline structure, and then removing an oxide film from the crystalline semiconductor film surface; a fourth step of introducing oxygen into the semiconductor film having a crystalline structure to make an oxygen concentration within the film from 5×10 18 /cm 3 to 1×10 21 /cm 3 ; a fifth step of removing an oxide film on the surface of the semiconductor film having a crystalline structure; and a sixth step of irradiating laser light under an inert gas atmosphere or in a vacuum to level the surface of the semiconductor film having a crystalline structure.