Patent ID: 7273774

Claim:
A method for making a thin-film semiconductor device, the method comprising: an annealing step of irradiating an amorphous semiconductor thin film with a laser beam so as to crystallize the amorphous semiconductor thin film, wherein, in the annealing step, a plurality of the selected regions in the semiconductor thin film are simultaneously irradiated, and; wherein, in the annealing step, the semiconductor thin film is continuously irradiated with the laser beam while shifting the position of the semiconductor thin film irradiated with the laser beam at a predetermined velocity so that excess hydrogen can be removed from the region irradiated with the laser beam without evaporating and expanding hydrogen ions in the semiconductor thin film, and further; wherein, in the annealing step, the excess hydrogen travels inside the semiconductor thin film along with the shifting of the region irradiated with the laser beam and is precipitated in the region of the semiconductor thin film at which the irradiation with the laser beam is terminated.