Patent ID: 7381598

Claim:
A method for fabricating an insulated gate semiconductor device comprising the steps of: forming an amorphous semiconductor film over a glass substrate; forming a mask comprising a photoresist film and a silicon compound film on the amorphous semiconductor film; introducing a dopant impurity into selected portions of the amorphous semiconductor film using said mask to form a pair of impurity regions; removing the photoresist film after the introduction of the dopant impurity; activating said selected portions of the amorphous semiconductor film by lamp annealing wherein said silicon compound film remains on the amorphous semiconductor film during said lamp annealing so that a crystallinity of the pair of impurity regions is increased while a region between the pair of impurity regions remains amorphous; and forming at least one electrode in contact with one of said selected portions of the semiconductor film after the lamp annealing, wherein said lamp annealing is carried out with a light having a wavelength of 0.5 μm to 4 μm and the lamp annealing is conducted from both upper and lower sides of the substrate.