Patent ID: 9029942
Filing Date: 2015-05-12
Classification: H01L

Abstract:
1. A power transistor device with a super junction, comprising: a substrate having a first conductivity type; a first epitaxial layer disposed on the substrate and having a plurality of trenches; a second epitaxial layer filling up the trenches and a top surface of the second epitaxial layer is higher than a top surface of the first epitaxial layer, wherein the second epitaxial layer has a plurality of through holes penetrating through the second epitaxial layer and disposed on the first epitaxial layer, and the second epitaxial layer and the first epitaxial layer have different conductivity type; and a third epitaxial layer filling up the through holes and in contact with the first epitaxial layer, wherein the third epitaxial layer and the first epitaxial layer have the same conductivity type, wherein the first epitaxial layer and the third epitaxial layer have different doping concentrations, and the first epitaxial layer and the third epitaxial layer have different widths in a direction parallel to a top surface of the substrate.