Patent ID: 7649223
Filing Date: 2010-01-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a drift region of a first conductivity type including an active element region and a peripheral region formed around said active element region; a first trench formed in said peripheral region; a second trench formed in said active element region; a gate insulating film and a gate electrode formed in each of said first and second trenches; a base region of a second conductivity type formed at least in said active element region; a plurality of column regions of said second conductivity type selectively formed separately from one another in each of said active element region and said peripheral region to thereby form a parallel p-n layer that comprises a portion of said drift region and selected ones of said column regions; a source region of said first conductivity type formed in said base region; a guard region of said second conductivity type formed below at least a portion of said first trench closest to said active element region, said guard region being free from being formed below said second trench, and a field electrode formed over said peripheral region and electrically connected to said gate electrode, said field electrode being formed without covering at least one of said column regions formed in said peripheral region, said at least one of said column regions being closest to said active element region.