Patent ID: 9224822
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: forming at least one placeholder semiconductor fin on a surface of a substrate, wherein said at least one placeholder semiconductor fin comprises, from bottom to top, a semiconductor material portion and a silicon germanium alloy portion, said silicon germanium alloy portion contains 30 atomic percent or greater germanium, a first content of substitutional carbon and a strain in a lengthwise direction of said at least one placeholder semiconductor fin; and annealing said at least one placeholder semiconductor fin, wherein said annealing converts said at least one placeholder semiconductor fin into at least one permanent semiconductor fin comprises, for bottom to top, said semiconductor material portion and a silicon germanium alloy portion, said silicon germanium alloy portion of said at least one permanent semiconductor fin contains 30 atomic percent or greater germanium, a second content of substitutional carbon and a strain in a lengthwise direction of said at least one permanent semiconductor fin, wherein said second content of substitutional carbon is less than said first content of substitutional carbon.