Patent ID: 6642123
Filing Date: 2003-11-04
Classification: C30B,H01L

Abstract:
A method of fabricating a silicon wafer, comprising steps of:preparing a silicon wafer by slicing an ingot, grinding and cleaning a sliced wafer; inserting the silicon wafer in a diffusion furnace having an ambience of one of Ar, N2, and inert gas including Ar and N2; pre-heating and maintaining the diffusion furnace at about 500Â° C.; changing the ambience inside the diffusion furnace into one of H2, Ar and inert gas including H2 and Ar successively; increasing a temperature of the diffusion furnace by a temperature-increasing speed of 50Ëœ70Â° C./min between 500Ëœ800Â° C., 10Ëœ50Â° C./min between 800Ëœ900Â° C., 0.5Ëœ10Â° C./min between 900Ëœ1000Â° C., and 0.1Ëœ0.5Â° C./min between 1000Ëœ1250Â° C.; maintaining the diffusion furnace at 1200Ëœ1250Â° C. for 1Ëœ120 min; changing the ambience inside the diffusion furnace into one of Ar, N2, and inert gas ambience including Ar and N2 successively; and decreasing the temperature of the diffusion furnace down to 500Â° C. by a temperature-decreasing speed of 0.1Ëœ0.5Â° C./min between 1000Ëœ1250Â° C., 0.5Ëœ10Â° C./min between 900Ëœ1000Â° C., 10Ëœ50Â° C./min between 800Ëœ900Â° C., and 50Ëœ70Â° C./min between 500Ëœ800Â° C.