Patent ID: 8395204
Filing Date: 2013-03-12
Classification: H01L

Abstract:
1. A power semiconductor device, comprising: an element unit comprising a vertical-type MOSFET, the vertical-type MOSFET comprising, a first semiconductor layer with a first conductivity type, a second semiconductor layer with the first conductivity type provided on a first main surface of the first semiconductor layer, an impurity concentration of the second semiconductor layer being lower than the first semiconductor layer, a third semiconductor layer with a second conductivity type provided on a surface of the second semiconductor layer, a fourth semiconductor layer with a first conductivity type selectively provided on a surface of the third semiconductor layer, a fifth semiconductor layer with the second conductivity type selectively provided on the surface of the third semiconductor layer, an insulator covering inner surfaces of a plurality of trenches, each trench penetrating the third semiconductor layer from a surface of the fourth semiconductor layer or a surface of the fifth semiconductor layer reaching the second semiconductor layer, the adjacent trenches being provided with a first interval in between, a first embedded conductive layer embedded at a bottom of the trench via the insulator, a second embedded conductive layer embedded at an upper portion of the first embedded conductive layer via the insulator, an interlayer insulator provided on the second embedded conductive layer, a first main electrode provided on a second main surface of the first semiconductor layer opposed to the first main surface, the first main electrode electrically connecting to the first semiconductor layer, a second main electrode provided on the a fourth semiconductor layer, the fifth semiconductor layer and the interlayer insulator, the second main electrode electrically connecting to the fourth semiconductor layer and the fifth semiconductor layer; and a diode unit adjacent to the element unit comprising,