Patent ID: 9595596
Date: 2017-03-14
CPC Classifications: H01L

Claim:
1. A power device, comprising: an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type; a termination region surrounding at least a portion of the active region and having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, each of the plurality of pillars of the first conductivity type in the active region and the termination region being defined by a trench; and an enrichment region at a bottom portion of one of the plurality of pillars of the first conductivity type in the active region, the enrichment region being an imbalance area having a doping extending to a depth in the power device deeper than a depth of the plurality of pillars of the second conductivity type and deeper than a depth of a bottom of each of the trenches of the first conductivity type.