Patent ID: 9570570
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A method for fabricating a field effect device comprising: providing a body having a top surface; forming a trench extending into the body from the top surface wherein the trench has a bottom and a plurality of side walls; depositing a dielectric layer substantially along the plurality of side walls to a first thickness and the bottom of the trench to a second thickness, wherein a single evaporative process is used to deposit the dielectric layer such that the second thickness of the dielectric layer on the bottom of the trench is substantially greater than the first thickness of the dielectric layer on the plurality of side walls of the trench where the second thickness has a thickness in a range between about 25% greater than the first thickness and about 100% greater than the first thickness; annealing the dielectric layer in nitric oxide; and forming a gate contact over the dielectric layer wherein the dielectric layer and the gate contact form a gate assembly for the field effect device and the body comprises silicon carbide.