Patent ID: 8052791
Filing Date: 2011-11-08
Classification: B23K,H01L,Y10T

Abstract:
1. A crystallization method comprising: an illuminating step for illuminating a phase modulation element which controls light intensity of incident light; a step for forming on an amorphous semiconductor film an image of light having a concave pattern that a light intensity distribution of a pattern in which the light intensity is minimum at a center and linearly increases toward a periphery by an image formation optical system provided at an output side of the phase modulation element is repeated at a certain amplitude; and a step for growing crystal from a crystal nucleus which is generated at a part irradiated with light having a smallest intensity of the light intensity distribution of the concave pattern, in accordance with the increase in the light intensity, the phase modulation element forming the light intensity distribution by a phase modulation unit string in which a plurality of phase modulation units each being optically smaller than a radius of a point spread distribution range of the image formation optical system are arranged, to form exit light haying the light intensity distribution of the concave pattern.