Patent ID: 6063684
Filing Date: 2000-05-16
Classification: C30B,H01L

Abstract:
A method for eliminating residual oxygen contaminants from crucible-drawn silicon wafers, comprising the steps of:(a) crucible-drawing a silicon crystal and preparing a silicon wafer, having a front side and a back side, from the crucible-drawn silicon crystal, said silicon wafer containing oxygen contaminants;(b) etching a plurality of trenches into said front side of said silicon wafer;(c) heating said silicon wafer to a temperature of approximately 1100.degree. C. in an atmosphere selected from the group consisting of a protective gas and a vacuum to drive out said oxygen contaminants to produce a silicon wafer usable to make highly blocking vertical power semiconductor components; and(d) filling said plurality of trenches with epitaxially deposited silicon.