Patent ID: 8853019
Filing Date: 2014-10-07
Classification: B82Y,H01L

Abstract:
1. A method of forming a device, comprising: forming a layer of silicon/germanium on a semiconductor substrate, said layer of silicon/germanium having a germanium concentration of at least 30%; forming a plurality of spaced-apart trenches that extend through said layer of silicon/germanium and at least partially into said semiconducting substrate, said trenches defining a fin structure for said device comprised of a portion of said semiconductor substrate and a portion of said layer of silicon/germanium, said portion of said layer of silicon/germanium having a first cross-sectional configuration; forming a layer of insulating material in said trenches and above said fin structure, wherein, after formation, said layer of insulating material comprises an oxidizing species; performing an anneal process on said device so as to cause said first cross-sectional configuration of said portion of said layer of silicon/germanium to change to a second cross-sectional configuration that is different from said first cross-sectional configuration; and forming a final gate structure around at least a portion of said portion of said layer of silicon/germanium having said second cross-sectional configuration.