Patent ID: 8410488
Filing Date: 2013-04-02
Classification: C30B,H01L,Y10T

Abstract:
1. A micropipe-free silicon carbide (SiC) wafer having a minimum diameter selected from a group of diameters consisting of at least 2 inches, at least 3 inches, and at least 100 mm, sliced from a SiC crystal grown in the nominal c-axis direction by a process of placing a source material and a seed material in a reaction crucible of a sublimation system, wherein constituent components of the sublimation system including at least the source material and the reaction crucible are substantially free from unintentional impurities, and controlling growth temperature, growth pressure, SiC sublimation flux and composition, and a temperature gradient between the source material and the seed material or a SiC crystal growing on the seed material during a physical vapor transport (PVT) process to eliminate micropipe-inducing process instabilities wherein the micropipe-free silicon carbide (SiC) wafer has a micropipe density of zero.