Patent ID: 9035365
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A method of forming a semiconductor device, comprising: forming a gate portion on a surface of a semiconductor substrate, the gate portion having gate sidewalls; forming gate spacers over the gate sidewalls and the surface of the semiconductor substrate, the gate spacers having first sidewalls; forming a sacrificial layer on the surface of the semiconductor substrate contacting the first sidewalls; forming second spacers on a top surface of the sacrificial layer and on the first sidewalls, the second spacers having second sidewalls; removing the sacrificial layer to expose a bottom surface of the second spacers and the surface of the semiconductor substrate; and forming raised source/drain (RSD) regions on the surface of the semiconductor substrate, the RSD regions having a faceted side portion contacting the gate sidewalls at the surface of the semiconductor substrate, thereby forming an air gap region in a region defined by a lower portion of the gate sidewalls, the bottom surface of the second spacers, and by the faceted side portions of the RSD regions.