Patent ID: 8193581
Filing Date: 2012-06-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first trench extending into a semiconductor region; a first dielectric layer lining opposing sidewalls of the first trench, the first dielectric layer being thicker along one of the opposing sidewalls than along the other; a gate electrode disposed in the first trench; a plurality of trenches extending into the semiconductor region, each of the plurality of trenches having opposing sidewalls lined with a dielectric layer and a gate electrode disposed between the sidewalls, the dielectric layer of each trench having the same thickness along the portions of both the opposing sidewalls that face the gate electrode; a second trench extending into the semiconductor region; a second dielectric layer lining opposing sidewalls of the second trench, the second dielectric layer being thicker along one of the opposing sidewalls of the second trench than along the other; and a gate electrode disposed in the second trench; and wherein the first and second trenches and the plurality of trenches are all stripe-shaped, and the plurality of trenches are disposed between the first and second trenches.