Patent ID: 9666485
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A method for forming a semiconductor device, comprising: providing a substrate; forming an epitaxial layer on the substrate; forming first trenches and second trenches in the epitaxial layer and being alternately arranged along a first direction; doping the epitaxial layer to form a first doping region and a second doping region in the epitaxial layer between the adjacent first and second trenches, wherein the first doping region and the second doping region have different conductivity types, and a super-junction structure is formed at an interface between the first doping region and the second doping region, and wherein an edge of the first doping region is coplanar with a sidewall of the first trench, and an edge of the second doping region is coplanar with a sidewall of the second trench; and forming a gate structure over the epitaxial layer, wherein the epitaxial layer under the gate structure comprises a channel extending along a second direction from a source region toward a drain region, the first direction is perpendicular to the second direction, and wherein the source region is in a well region in the epitaxial layer, the well region is under a portion of the gate structure and separated from the first doping region and the second doping region, the gate structure covers one end of each first trench and one end of each second trench, and the second direction is a lateral direction.