Patent ID: 8980759
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A method of forming a slanted field plate comprising: forming epitaxy for a field effect transistor (FET) on a substrate; forming a wall on the epitaxy near a drain of the FET, the wall comprising a first negative tone electron-beam resist; depositing a dielectric over the epitaxy and the wall, the wall causing the dielectric to have a step near the drain of the FET; depositing a second negative tone electron-beam resist over the dielectric, wherein surface tension causes the deposited second negative tone electron-beam resist to have a slanted top surface between the step and a source of the FET; etching anisotropically vertically the second negative tone electron-beam resist and the dielectric to remove the second negative tone electron-beam resist and to transfer a shape of the slanted top surface to the dielectric between the step and the source of the FET; and forming a gatehead comprising metal on the dielectric between the step and the source of the FET; wherein the gatehead forms a slanted field plate.