Patent ID: 9064952
Filing Date: 2015-06-23
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate including an element domain and a termination domain that surrounds the element domain; a first main electrode disposed on an upper surface of the semiconductor substrate; and a second main electrode disposed on a lower surface of the semiconductor substrate; wherein (a) the element domain comprises a first portion of a body region of a first conductivity type, a first portion of a drift region of a second conductivity type opposite to the first conductivity type, a gate electrode, and an insulator, the first portion of the body region exposed at the upper surface of the semiconductor substrate is a first conductive type region and contacts with the first main electrode, the first portion of the drift region disposed on a lower surface of the first portion of the body region, the gate electrode is disposed within a gate trench, wherein the gate trench penetrates the first portion of the body region and extends to said first portion of the drift region, and the insulator is disposed between the gate electrode and a wall of the gate trench, (b) the termination domain comprises at least a second portion of said drift region, and the termination domain is provided with at least two termination trenches surrounding the element domain, wherein each of the at least two terminal trenches is extending from the upper surface of the semiconductor substrate to the second portion of said drift region, wherein the at least two terminal trenches are spaced apart from each other by an interval, and (c) a floating region of the first conductivity type is provided at a bottom of each of the termination trenches but not provided at a bottom of the gate trench.