Patent ID: 8071450
Filing Date: 2011-12-06
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: preparing a semiconductor wafer with a substrate of a first conductivity type; forming a first epitaxial layer of the first conductivity type on the substrate, the first epitaxial layer having a first thickness; growing a first oxide layer on the first epitaxial layer; masking the first oxide layer; ion implanting to create at least one first embedded region of a second conductivity type in the first epitaxial layer; removing the first oxide layer; forming a second epitaxial layer of the first conductivity type on the first epitaxial layer, the second epitaxial layer having a second thickness that is greater than the first thickness minus a thickness equal to a thickness, in a direction extending away from the substrate, of the at least one first embedded region of the second conductivity type; growing a second oxide layer on the second epitaxial layer; masking the second oxide layer; ion implanting to create at least one second embedded region of a second conductivity type in the second epitaxial layer; and removing the second oxide layer.