Patent ID: 7147710
Filing Date: 2006-12-12
Classification: C30B

Abstract:
1. A method of manufacturing an epitaxial silicon wafer, comprising: a silicon ingot manufacturing step of pulling a silicon ingot under a pulling condition in which an LSTD density assumes a value of 1×10 a step of slicing a silicon wafer off the silicon ingot manufactured in the silicon ingot manufacturing step to obtain the silicon wafer having the shallow recessed pits on the surface of the silicon wafer; an annealing step for smoothing the surface of the silicon wafer by annealing the sliced off silicon wafer under an annealing condition in which an annealing temperature is 1000° C. or more; whereby the shallow recessed pits on the surface of the silicon wafer are converted into gently-sloped, shallow and wider recesses; and an epitaxial layer growing step of growing an epitaxial layer on the surface of the smoothed silicon wafer, the grown epitaxial layer being an extremely thin film having a thickness sufficient for causing LPDs on a surface of the grown epitaxial layer to be extinct.