Patent ID: 9263549
Filing Date: 2016-02-16
CPC Classification: H01L

Claim Text:
1. A method of forming a field effect transistor, comprising: forming a punchthrough region in a substrate, the punchthrough region having a first conductivity type; forming an epitaxial layer on the substrate, the epitaxial layer having the first conductivity type; patterning the epitaxial layer to form a fin that protrudes from the substrate; forming a dummy gate and gate sidewall spacers on the fin; removing portions of the fin on respective opposite sides of the dummy gate to form source/drain recess regions on the respective opposite sides of the dummy gate, the source/drain recess regions exposing the punchthrough region in the substrate; and forming source and drain regions in the respective source/drain recess regions, the source and drain regions having a second conductivity type, the second conductivity type being opposite the first conductivity type.