Patent ID: 9620416
Date: 2017-04-11
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor device comprising: providing a plurality of fin structures, wherein a surface of the fin structures has a first orientation for a diamond shaped epitaxial growth surface; growing a first epitaxial semiconductor material having a diamond geometry on the diamond shaped epitaxial growth surface; forming a blocking material protecting a lower portion of the first epitaxial semiconductor material and leaving an upper portion of the first epitaxial semiconductor material exposed; removing an apex portion of the first epitaxial semiconductor material to expose a second orientation surface of the first epitaxial semiconductor material having a planar upper surface for merged epitaxial semiconductor growth, wherein an entirety of the sidewalls of the first epitaxial semiconductor material tapers with a decreasing width dimension in a direction extending from the planar upper surface to a base of the first epitaxial semiconductor material; and epitaxially forming a second epitaxial semiconductor material on the first epitaxial semiconductor material, the second epitaxial semiconductor material having a substantially rectangular geometry with a substantially planar upper surface and extending into direct contact with at least two adjacent fin structures of said plurality of fin structures.