Patent ID: 9478441
Filing Date: 2016-10-25
CPC Classification: H01L

Claim Text:
1. A method for forming a superjunction device on a substrate having a first conductivity type, the method comprising: forming a plurality of horizontal first layers of semiconductor material over the substrate, the first layers of semiconductor material being of the first conductivity type, wherein a first layer of said plurality of horizontal first layers is below a second layer of said plurality of horizontal first layers; and diffusing semiconductor material of a second conductivity type in a plurality of vertically aligned regions on each of the first and second layers, the plurality of vertically aligned regions forming spaced pylons whose widths are narrower than a distance between two adjacent pylons, wherein the vertically aligned regions of the second layer are laterally wider than the vertically aligned regions of the first layer, and wherein a plurality of respective top surfaces of the vertically aligned regions of the second layer are below active regions of the superjunction device.