Patent ID: 9431481
Filing Date: 2016-08-30
CPC Classification: H01L

Claim Text:
1. A power device comprising: at least one epitaxial layer of a first conductivity type; an active region; a termination region surrounding the active region; a plurality of trenches disposed in the at least one epitaxial layer; and silicon material of a second conductivity type disposed in the plurality of trenches, the silicon material of the second conductivity type, together with a plurality of mesas defined in the at least one epitaxial layer by the plurality of trenches, defining a plurality of concentric octagon-shaped pillars of alternating conductivity type, at least a first portion of the concentric octagon-shaped pillars being disposed in the active region and at least a second portion of the concentric octagon-shaped pillars being disposed in the termination region, sidewalls of the plurality of trenches defining a first four legs and a second four legs of each of the plurality of concentric octagon-shaped pillars, the sidewalls having a same crystallographic plane direction, the first four legs including at least two legs of a first length and the second four legs including at least two legs of a second length, the second length being different than the first length.