Patent ID: 6255199
Filing Date: 2001-07-03
Classification: H01L

Abstract:
A method of producing polycrystalline silicon, comprising the step of:depositing a non-monocrystalline silicon layer on a substrate; andscanning a region of the non-monocrystalline silicon layer with a laser beam in a first direction, thereby crystallizing the non-monocrystalline silicon of the region, said laser beam forming an elongated beam spot on the non-monocrystalline silicon layer, said beam spot extending in a second direction perpendicular to the first direction,wherein the laser beam has an intensity distribution in the first direction, said distribution being one indicated by a convex curve which includes a peak representing a maximum intensity and which has a radius of curvature of 0.2 .mu.m to 4 .mu.m when maximum intensity is represented by a distance of 1 m.