Patent ID: 9716142
Date: 2017-07-25
CPC Classifications: H01L

Claim:
1. A method of forming silicon germanium (SiGe) nanowires, the method comprising the steps of: forming a stack of alternating silicon (Si) and SiGe layers on a wafer; patterning fins in the stack; selectively thinning the SiGe layers in the fins such that the Si and SiGe layers give the fins an hourglass shape; epitaxially growing SiGe selectively on sidewalls of the Si layers in the fins after the SiGe layers in the fins have been thinned; burying the fins in an oxide material; and annealing the fins under conditions sufficient to diffuse germanium (Ge) from the SiGe layers in the fins to the Si layers in the fins to form the SiGe nanowires.