Patent ID: 6930356
Filing Date: 2005-08-16
Classification: H01L

Abstract:
1. A power semiconductor device comprising: a semiconductor substrate; a first drift region of a first conductivity type extending over the semiconductor substrate, the first drift region having a lower impurity concentration than the semiconductor substrate; a second drift region of a the first conductivity type extending over the first drift region, the second drift region having a higher impurity concentration than the first drift region; a plurality of stripe-shaped body regions of a second conductivity type formed in an upper portion of the second drift region; a third region of the first conductivity type formed in an upper portion of each body region so as to form a channel region in each body region between the third region and the second drift region; and a gate electrode laterally extending over but being insulated from: (i) the channel region in each body region, (ii) a surface area of the second drift region between adjacent stripes of body regions, and (iii) a surface portion of each third region wherein adjacent stripes of body regions are spaced apart from one another by a predetermined distance such that when a reverse bias is applied across the junction formed between each body region and the second drift region a resulting depletion region has a substantially flat boundary in the second drift region.