Patent ID: 9589848
Date: 2017-03-07
CPC Classifications: H01L

Claim:
1. A method comprising: forming a patterned mandrel layer on a semiconductor substrate, the patterned mandrel layer including mandrel portions having side walls; recessing one or more portions of the semiconductor substrate to form one or more trenches within the semiconductor substrate; epitaxially growing a silicon germanium layer within the one or more trenches; forming spacers on the side walls of the mandrel portions; removing the mandrel portions from the semiconductor substrate; removing portions of the semiconductor substrate and the silicon germanium layer between the spacers, thereby forming a first plurality of parallel fins from the semiconductor substrate and a second plurality of parallel fins from the silicon germanium layer; forming a mask over a selected region of the semiconductor substrate and selected mandrel portions in the selected region of the semiconductor substrate prior to recessing the one or more portions of the semiconductor substrate; and removing the mask following the step of epitaxially growing the silicon germanium layer, wherein the semiconductor substrate comprises a bulk silicon substrate.