Patent ID: 7387922

Claim:
A method for manufacturing a semiconductor device, comprising: forming a non-single crystal semiconductor film over a substrate; providing a light-shielding film with an opening over the non-single crystal semiconductor film; shaping a laser beam emitted from a laser oscillator to become a beam spot on a surface to be irradiated; and performing laser annealing to the non-single crystal semiconductor film through the opening of the light-shielding film while relatively moving the substrate in a direction of a minor axis of the beam spot, wherein the beam spot has one of a linear shape and an elliptical shape, wherein a surface of the non-single crystal semiconductor film is the surface to be irradiated, wherein a portion of the beam spot is shielded with the light-shielding film while the laser annealing to the non-single crystal semiconductor film is performed, and wherein the portion of the beam spot has a lower energy density than the center of the beam spot.