Patent ID: 9287384
Filing Date: 2016-03-15
CPC Classification: H01L

Claim Text:
1. A method for forming a transistor, comprising: providing a semiconductor body; forming a body region of a first conductivity type in the semiconductor body; forming a gate electrode partially overlapping the body region, the gate electrode being insulated from the semiconductor body by a gate dielectric layer; forming a source diffusion region of a second conductivity type in the body region on a first side of the gate electrode; forming a trench in the semiconductor body on a second side, opposite the first side, of the gate electrode; forming a sidewall dielectric layer lining the sidewall only of the trench without filling the trench; and implanting dopants of the second conductivity type in the semiconductor body along the sidewall of the trench to form a doped sidewall region in the semiconductor body along the sidewall of the trench, the doped sidewall region forming a vertical drain current path in the semiconductor body adjacent the trench for the transistor.