Patent ID: 6472232
Filing Date: 2002-10-29
Classification: H01L,Y10T

Abstract:
A method for fabricating a semiconductor wafer, comprising the steps of:providing a substrate that includes a semiconductor material having a first dopant; forming an amorphous layer from a top portion of the substrate; doping the amorphous layer with a second dopant, wherein a polarity of the second dopant is opposite to a polarity of the first dopant; and heating the substrate for a period to a temperature between about 450 C. and about 625 C. such that portion of the amorphous layer is recrystallized to form a recrystallized layer, with a variable thickness without totally recrystallizing the amorphous layer, wherein such variable thickness is used to adjust a spatial distribution of heating to achieve recrystallized layer with uniform thickness.