Patent ID: 9666715
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A field effect transistor with epitaxial structures, comprising: a fin-shaped structure extending along a first direction, disposed on a semiconductor substrate; and a metal gate across the fin-shaped structure, wherein the metal gate comprises a pair of recess regions respectively disposed on two sides of a bottom of a lower part of the metal gate, wherein each of the recess regions comprises a vertical region and a slanted region sequentially arranged from a bottom to a top of the recess regions, and a boundary between the vertical region and the slanted region of the recess region aligns with a top surface of the fin-shaped structure, and an upper part of the metal gate and a lower part of the metal gate respectively have a width along the first direction, the width of the upper part of the metal gate greater than the width of the lower part of the metal gate between the pair of the recess regions.