Patent ID: 6818569
Filing Date: 2004-11-16
Classification: H01L

Abstract:
A method of fabricating an annealed silicon wafer with uniform boron concentration, comprising:a first annealing step of pre-heating the silicon wafer at a temperature of approximately 500Â° C. in a furnace in a gas ambience consisting of one of the inert gases Ar and N2; a second annealing step of changing the ambience of the gas into a 100% H2 gas ambience, increasing the temperature to approximately 1,100Â° C., and carrying out annealing for approximately ten minutes while maintaining the temperature of approximately 1,100Â° C.; a third annealing step of changing the ambience of the gas into a 100% Ar gas ambience, increasing the temperature to approximately 1,200Â° C., and carrying out annealing for approximately an hour while the temperature of approximately 1,200Â° C. is maintained; and a temperature dropping step of decreasing the temperature in the furnace below approximately 500Â° C.