Patent ID: 6995396
Filing Date: 2006-02-07
Classification: C30B,H01L

Abstract:
1. A semiconductor substrate comprising: a SiC bulk substrate; and an epitaxially grown layer of SiC provided over said SiC bulk substrate, wherein said epitaxially grown layer has a first SiC layer, and a second SiC layer including a carrier dopant in a concentration higher than in said first SiC layer, having a thickness smaller than said first SiC layer and provided on or underneath said first SiC layer, assuming that said first SiC layer has a thickness t and that irregularities formed on a top face of said first SiC layer have a step height h, a ratio h/t between the step height h and the thickness t of said first SiC layer is in a range from 10 an average step height of a top face of said second SiC layer is 5 nm or less.