Patent ID: 8916930
Filing Date: 2014-12-23
Classification: H01L

Abstract:
1. A trenched power semiconductor device, comprising: a base; a plurality of trenches, which include at least a gate trench, located in the base; at least a gate polysilicon structure, located in the gate trench; a gate dielectric layer, encircling a side surface and a bottom of the gate polysilicon structure; a plurality of first heavily doped regions, located below at least some of the trenches and spaced from bottoms of the respective trenches with a lightly doped layer, and the first heavily doped regions being overlapped with each other to form a conductive path; at least a body, encircling the gate trench and spaced from the first heavily doped region with a predetermined distance; at least a source region, located in an upper portion of the body; an interlayer dielectric layer, covering the gate polysilicon structure and having at least a source contact window therein to expose the source region; a drain contact window, located near an edge of the base; a second heavily doped region, locate below the drain contact window and electrically connected to the conductive path; and a metal layer, filling the drain contact window and electrically connected to the second heavily doped region.