Patent ID: 8853771

Claim:
A superjunction device, comprising: a semiconductor substrate having a first conductivity type; a semiconductor epitaxial layer having a first conductivity type, the semiconductor epitaxial layer being formed on the semiconductor substrate; a current-flowing area formed in the semiconductor epitaxial layer, the current-flowing area including a plurality of parallel arranged first trenches, each of the first trenches extending along a surface of the semiconductor substrate epitaxial layer in a first direction perpendicular to a direction of depth; a termination structure formed in the semiconductor epitaxial layer and enclosing the current-flowing area, the termination structure including a plurality of parallel arranged and substantially annular-shaped second trenches, each of the second trenches including a plurality of alternately arranged first sides and second sides, each of the first sides extending in the first direction, each of the second sides extending in a second direction both perpendicular to the first direction and the direction of depth; and a semiconductor epitaxial material having a second conductivity type, the semiconductor epitaxial material being filled in each of the first and second trenches, wherein the semiconductor epitaxial material filled in the first and second trenches form pillars having a second conductivity type, and portions of the semiconductor epitaxial layer between every two adjacent pillars having a second conductivity type form pillars having a first conductivity type, and wherein the pillars having a first conductivity type and the pillars having a second conductivity type are alternately arranged.