Patent ID: 6798498
Filing Date: 2004-09-28
Classification: G01N

Abstract:
An apparatus for evaluating a polysilicon film formed by annealing an amorphous silicon film, comprising:a stage configured to receive a substrate thereon, said substrate carrying a polysilicon film formed thereon; a first optical system configured to observe visible light, said first optical system illuminating the visible light on said substrate on said stage for photographing a surface image of said polysilicon film on said substrate to effect auto-focusing; a second optical system configured to observe UV light, said second optical system illuminating the UV light on said substrate on said stage for acquiring a surface image of said polysilicon film on said substrate, auto-focused using said second optical system for observation with the visible light; and evaluation means for evaluating the linearity and periodicity of a spatial structure of a film surface of said polysilicon film from the surface image of said polysilicon film acquired by said second optical system to evaluate a state of said polysilicon film based on evaluation of said linearity and periodicity.