Patent ID: 8836028

Claim:
A power device comprising: at least one N-type epitaxial layer disposed on a substrate; a plurality of trenches extending into the at least one N-type epitaxial layer, the plurality of trenches being filled with a P-type silicon material, the P-type silicon material in the plurality of trenches defining P-pillars, portions of the at least one N-type epitaxial layer separating the P-pillars defining N-pillars, such that the N-pillars and the P-pillars define alternating P-N-pillars; an active region; and a termination region surrounding the active region, the alternating P-N-pillars being disposed in both the active region and the termination region, the termination region including a predetermined number of floating P-pillars, each N-pillar located between two adjacent floating P-pillars of the predetermined number of floating P-pillars including an N-type surface region disposed along an upper surface, the N-type surface region having a lower doping concentration than a doping concentration of a remaining portion of the N-pillar in which the N-type surface region is disposed.