Patent ID: 7052982
Filing Date: 2006-05-30
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: providing a semiconductor substrate having first and second main surfaces opposite to each other, the semiconductor substrate having a heavily doped region of a first conductivity type at the second main surface and having a lightly doped region of the first conductivity type at the first main surface; forming in the semiconductor substrate a plurality of trenches and a plurality of mesas with each mesa having an adjoining trench and a first extending portion extending from the first main surface toward the heavily doped region to a first depth position, at least one mesa having a first sidewall surface and a second sidewall surface, each of the plurality of trenches having a bottom; implanting a dopant of a second conductivity type into the first sidewall surface of the at least one mesa to form a first doped region of the second conductivity type; implanting the dopant of the second conductivity type into the second sidewall surface of the at least one mesa to form a second doped region of the second conductivity type; diffusing the implanted dopants into the at least one mesa; implanting a dopant of the first conductivity type into the first sidewall surface of the at least one mesa to provide a second doped region of the first conductivity type at the first sidewall, and implanting the dopant of the first conductivity type into a second sidewall surface of the at least one mesa; diffusing the implanted dopants into the the at least one mesa to provide a second doped region of the first conductivity type at the first and second sidewalls; and filling at least the trenches adjacent to the at least one mesa with one of a semi-insulating material and an insulating material.