Patent ID: 6190949
Filing Date: 2001-02-20
Classification: B82Y,H01L,Y10T

Abstract:
A process of forming a silicon thin film, comprising the steps of:irradiating a pulsed rectangular ultraviolet beam on an amorphous or polycrystalline silicon layer formed on a base body, to thereby form a silicon thin film composed of a group of silicon single crystal grains on said base body;moving the beam with the moved amount of an ultraviolet beam irradiating position in a period from completion of an irradiation pulse of said rectangular ultraviolet beam to starting of the next irradiation pulse of said rectangular ultraviolet beam being in a range of 4 .mu.m to 20 .mu.m, and a ratio of said moved amount to a width of said rectangular ultraviolet beam measured in the movement direction thereof being in a range of 0.1 to 5%, to form a silicon thin film composed of a group of silicon single crystal grains which are each approximately rectangular-shaped and which are arranged in a grid pattern on said base body, a selected orientation of said silicon single crystal grains to the surface of said base body being approximately the <100> direction.