Patent ID: 6806099
Filing Date: 2004-10-19
Classification: C30B,H01L

Abstract:
A process for producing a polycrystal silicon film which comprises a step of forming a polycrystal silicon film by light irradiation of a silicon film formed on a substrate with scanning the substrate; a step of measuring the grain size of said polycrystal silicon film by determining the poly-silicon grain size by measuring a diffraction pattern; and a step of adjusting the energy of said light irradiation on the basis of said grain size,wherein said determining the poly-silicon grain size by measuring said light diffraction pattern comprises irradiating the substrate sample with a light beam having a wavelength of less than 540 nm, measuring the angle dependency of scattered light intensity at least in an angle range of 5Â° to 40Â° from an axis of the irradiating light beam, and determining the grain size from the thus obtained information on the angular distribution.