Patent ID: 9653605
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A fin field effect transistor (FinFET) device structure, comprising: a substrate; a fin structure extending above the substrate; an epitaxial structure formed on the fin structure, wherein the epitaxial structure has a first height, and the epitaxial structure comprises a rhombus-like upper portion and a column-like lower portion; fin sidewall spacers formed adjacent to the epitaxial structure, wherein the fin sidewall spacers have a second height and the first height is greater than the second height, and wherein the rhombus-like upper portion is entirely above a top of the fin sidewall spacers, and a junction between the rhombus-like upper portion and the sidewall of the column-like lower portion is higher than a peak of the fin sidewall spacers, and a bottom surface of the column-like lower portion is leveled with a bottom surface of the fin sidewall spacers.