Patent ID: 8101018

Claim:
A method for fabricating a semiconductor device, the method including: forming an amorphous silicon film on a substrate; preprocessing the amorphous silicon film by modifying the amorphous silicon film to prepare the amorphous silicon film to be made polycrystalline; laser processing the amorphous silicon film modified through the preprocessing step for producing a polycrystalline silicon film; and laser power inspecting/extracting for inspecting for the presence of a foreign object or an abnormality in the preprocessing step by imaging by use of the amorphous silicon film having undergone the preprocessing step, and for performing laser preprocessing on a predetermined region of the amorphous silicon film having undergone the preprocessing while varying laser power as an irradiated spot moves, and performing inspection using spectroscopy at each of a plurality of positions at which the laser processing has been performed at different laser powers, to determine a laser power based on a result of the inspection; wherein the laser processing step uses the laser power determined in the laser power inspection/extraction step.