Patent ID: 7135388

Claim:
A method for fabricating single crystal silicon film comprising: forming a single crystal region through a laser irradiation after forming a semiconductor layer or a metal thin film on a transparent or semi-transparent substrate, which comprises the steps of: forming a single crystal seed region on the substrate of a desired size by a crystallization method using laser irradiation, the step of forming a single crystal seed region being comprised of the steps of: irradiating the substrate of the desired size with a laser in a specific shape through a mask so that the laser-irradiated portion is firstly crystallized; conducting a first scanning process which comprises moving the laser by a desired distance so that a grain in the firstly crystallized portion is grown by the desired distance; completing a first scanning process after it was progressed by the desired distance, thereby forming a poly-crystal island region; conducting a second scanning process which comprises 90 degree turning of the laser at the end of the first scanning process and scanning the seed grain formed in an elongated shape in the scanning direction during the first scanning process, so that the seed grain is grown to form a single crystal region; and irradiating the laser onto a portion of a single crystal seed region formed after progressing the second scanning process by the desired distance, thereby extending the single crystal region.