Patent ID: 8963239
Filing Date: 2015-02-24
Classification: H01L

Abstract:
1. A superjunction device comprising: a semiconductor substrate having first and second main surfaces and a first doping concentration of a dopant of a first conductivity type; a first semiconductor layer formed on the first main surface of the semiconductor substrate and having a second doping concentration of the dopant of the first conductivity type; a second semiconductor layer formed on the first semiconductor layer and having a main surface opposite to the first semiconductor layer; at least one trench formed in the second semiconductor layer and extending from the main surface through the second semiconductor layer and at least partially into the first semiconductor layer; a first region having a third doping concentration of the dopant of the first conductivity type, the first region extending at least partially between the main surface of the second semiconductor layer and the first semiconductor layer; a second region having a fourth doping concentration of a dopant of a second conductivity type different from the first conductivity type, the second region being disposed between the first region and a sidewall of the at least one trench and extending at least partially between the main surface of the second semiconductor layer and the first semiconductor layer; and a third region having a fifth doping concentration of the dopant of the first conductivity type, the third region being disposed proximate to the main surface of the second semiconductor layer.