Patent ID: 9704860
Date: 2017-07-11
CPC Classifications: H01L

Claim:
1. A method of forming a fin structure comprising: forming a hard mask on a semiconductor substrate of a first lattice dimension; etching first openings into a first portion of the semiconductor substrate exposed by the hard mask; forming an epitaxial oxide in the first openings, the epitaxial oxide having a second lattice dimension different than the semiconductor substrate; etching a second portion of the semiconductor substrate using the epitaxial oxide as an etch mask to form second openings in the semiconductor substrate; depositing an epitaxial semiconductor material in the second openings, the epitaxial semiconductor material having said second lattice dimension that is different than the first lattice dimension, wherein a difference between the first lattice dimension and the second lattice dimension induces a strain in the epitaxial semiconductor material; and patterning each region of epitaxial deposited semiconductor material to provide fin structures having said strain, wherein the epitaxial oxide is present in a fin cut space and obstructs relaxation of the fin strain.