Patent ID: 9583572
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor device, comprising: forming a semiconductor fin structure on a substrate, wherein the semiconductor fin structure comprises a first sidewall and a second sidewall, wherein a distance between the first and second sidewalls defines a first width of the semiconductor fin structure, wherein the semiconductor fin structure comprises a hard mask layer disposed on a top surface thereof, wherein the hard mask layer comprises a width substantially equal to the first width of the semiconductor fin structure; etching a least a portion of the first and second sidewalls of the semiconductor fin structure to form first and second recessed sidewalls that define a thinned portion of the semiconductor fin structure, wherein a distance between the first and second recessed sidewalls defines a second width of the thinned portion of the semiconductor fin structure, which is less than the first width; growing semiconductor alloy layers on the first and second recessed sidewalk of the thinned portion of the semiconductor fin structure; and anisotropically etching the semiconductor alloy layers using the hard mask layer disposed on the semiconductor fin structure as an etch mask to form planarized semiconductor alloy layers of uniform thickness on the first and second recessed sidewalls of the thinned portion of the semiconductor fin structure.