Patent ID: 6995396

Claim:
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 −6 to 10 −1 , and an average step height h is 5 nm or less, and an average step height of a top face of said second SiC layer is 5 nm or less.