Patent ID: 8174067
Filing Date: 2012-05-08
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first trench extending into a semiconductor region and having a first end and a second end; a first dielectric layer lining opposing sidewalls of the first trench; a first shield electrode disposed in the first trench; a second trench extending into the semiconductor region and having a first end and a second end; a second dielectric layer lining opposing sidewalls of the second trench; a second shield electrode disposed in the second trench; and a first well region of a first conductivity type disposed in the semiconductor region and between the first and second trenches, the first well region abutting at least a portion of at least one of the first and second trenches and being spaced from the first end of the first trench by at least a first distance; and wherein there is no other well region of a first conductivity type disposed between the first well region and the first end of the first trench.