Patent ID: 7393418

Claim:
A susceptor for use in growing semiconductor wafers, comprising: a base which comprises at least one surface, comprising a recess formed in the coated surface for mounting a wafer the recess comprising a generally flat floor region defining a contact portion for the wafer, an outer circumferential vertical portion, and a rounded transitional portion providing a transition between a lower portion of the outer circumferential vertical portion of the recess and the generally flat floor region of the recess; a layer of SiC coating the surface and the recess; a second ring-shaped SiC crystal growth surface portion provided within the rounded transitional portion located at a distance within a range of 0.05 mm to 0.3 mm less defined from the outer circumference vertical portion of the recess and wherein a surface roughness Ra in the contact portion, where the susceptor contacts the wafer is within on the recess, having a surface roughness Ra in a range of 0.5 μm 3 μm less.