Patent ID: 8877614
Filing Date: 2014-11-04
Classification: H01L

Abstract:
1. A method for forming a semiconductor structure, the method comprising: forming an epitaxial region in a substrate, the epitaxial region having a facet between a top surface of the substrate and a top surface of the epitaxial region, the substrate having a gate structure on the top surface of the substrate, the gate structure comprising a gate electrode and a gate spacer along a sidewall of the gate electrode; depositing a spacer material laterally between the facet and the gate structure, the spacer material adjoining an exterior sidewall of the gate spacer and adjoining the facet; and depositing an etch stop layer over the spacer material and the epitaxial region, the etch stop layer adjoining each of the spacer material and the epitaxial region, a ratio of an etch selectivity of the spacer material to an etch selectivity of the etch stop layer being equal to or less than 3:1.