Patent ID: 9425108
Filing Date: 2016-08-23
CPC Classification: H01L

Claim Text:
1. A method for preventing epitaxial growth in a semiconductor device comprising: cutting fins of FinFET structure to form a set of exposed fin ends; depositing a conformal layer of sidewall spacer material over the FinFET structure; performing an etch to remove the conformal layer of sidewall spacer material on horizontal surfaces leaving sidewall spacers on vertical portions of the FinFET structure including the set of exposed fin ends, the step of performing an etch producing a set of spacer covered fin ends; depositing a layer of silicon oxide in a well area over the conformal layer of sidewall spacer material; performing a chemical mechanical polishing step to remove excess silicon oxide; etching oxide areas around the FinFET structure to reveal the fins for further processing; and wherein the set of sidewall spacers prevent epitaxial growth at the set of spacer covered fin ends.