Patent ID: 6777317
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A method of forming a doped polycrystalline silicon gate in a Metal Oxide Semiconductor CMOS) device formed on a top surface of a crystalline silicon substrate comprising:a) forming an insulation layer on said top surface the silicon substrate; b) forming an amorphous silicon layer on top of and in contact with said insulation layer; c) introducing a dopant in a top surface of said amorphous silicon layer; and d) irradiating said top surface of said amorphous silicon layer with a radiation beam to heat said top surface to a temperature between 1150Â° C. and the melting temperature of said silicon substrate to initiate explosive recrystallization of said amorphous silicon layer from said top surface to the contact with said insulation layer to transform said amorphous silicon layer into a polycrystalline silicon gate with said dopant distributed uniformly throughout said polycrystalline gate.