Patent ID: 8999821
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method of forming a fin structure for a field effect transistor, the method comprising: patterning a mandrel on a surface of a substrate to form adjacent columns of patterned mandrel; depositing an epitaxial layer of high-mobility channel material over exposed surfaces of the patterned mandrel, wherein the epitaxial layer leaves a gap between the adjacent columns of the patterned mandrel; depositing dielectric material in a gap between the adjacent columns of the patterned mandrel; planarizing the epitaxial layer to form a planarized epitaxial layer and exposing the adjacent columns of the patterned mandrel; and etching at least a portion of the adjacent columns of the patterned mandrel and the dielectric material to expose at least a portion of the planarized epitaxial layer that forms the fin structure.