Patent ID: 6525375
Filing Date: 2003-02-25
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate that comprises a principal surface and a back surface opposite to the principal surface, wherein the semiconductor substrate further comprises a first semiconductor region on a side of the principal surface, a second semiconductor region that vertically and laterally encompasses the first semiconductor region and a third semiconductor region that vertically and laterally encompasses the second semiconductor region; a trench disposed on the side of the principal surface, wherein the trench has a contour that laterally traverses from the first semiconductor region through the second semiconductor region and into the third semiconductor region; a gate electrode for filling the trench; a MOS structure formed on a sidewall of the trench, wherein the MOS structure has a channel width defined along a depth direction of the semiconductor substrate; and a lateral impurity concentration profile within the second semiconductor region, wherein the lateral impurity concentration profile has a uniform concentration along the depth direction of the semiconductor substrate.