Patent ID: 9159794
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: forming a semiconductor fin on a semiconductor substrate; forming an epitaxial semiconductor region disposed on the semiconductor fin; forming a nitride contact etch stop layer on the semiconductor fin; depositing a blanket oxide layer on the semiconductor fin; performing a first anisotropic etch on the blanket oxide layer over the semiconductor fin to form a cavity; performing a first isotropic etch on the blanket oxide layer over the semiconductor fin; depositing a conformal oxide layer on the nitride contact etch stop layer; performing a second anisotropic etch on the blanket oxide layer over the semiconductor fin; performing a nitride-oxide conversion process; performing a second isotropic etch on the conformal oxide layer; and depositing a fill metal in the cavity.