Patent ID: 7591908
Filing Date: 2009-09-22
Classification: C30B,H01L

Abstract:
1. A method of vapor phase growth with reduced slip dislocation frequency, comprising: providing a silicon single crystal substrate of 300 mm or more, the substrate having a main surface and a rear surface; heat treating at least one susceptor having a body section formed of graphite and coated with silicon carbide (SiC), the susceptor body section having a longitudinal length and also including part, wherein the pocket has an initial maximum depth D defined between the bottom surface of the inner peripheral side part in the pocket and a plane defining the location of the rear surface of the silicon single crystal substrate when mounted on the outer peripheral side part over the pocket; selecting a heat treated susceptor from among the at least one susceptor in which the body section has warped along the longitudinal length in an inverted U-shape so that after heat treatment the pocket has a reduced pocket depth (D−β) that has been reduced due to the inverted U-shaped warping by warping amount β; mounting the silicon single crystal substrate on the outer peripheral side part of the selected susceptor over the pocket; performing a vapor phase growth of a silicon epitaxial layer on the main surface of the substrate by heating the silicon single crystal substrate from above and from below with an upper heating unit and a lower heating unit; and forming the resultant substrate as a result of vapor phase growth with reduced slip dislocation frequency.