Patent ID: 9159811
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure, the method comprising: forming a fin on a semiconductor substrate; forming a gate over a portion of the fin; removing a portion of the fin not below the gate to expose a sidewall of the fin beneath the gate and a top surface of the semiconductor substrate; forming a first protective layer on the top surface of the semiconductor substrate, the first protective layer not on the sidewall of the fin; forming a second protective layer on the sidewall of the fin, the second protective layer prevented from forming on the top surface of the semiconductor substrate by the first protective layer; removing the first protective layer to expose the top surface of the semiconductor substrate; forming a buffer layer on the top surface of the semiconductor substrate; the buffer layer prevented from forming on the sidewall of the fin by the second protective layer; and forming a source-drain region on the buffer layer, the source-drain region electrically connected to the fin.