Patent ID: 9613955
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A method of forming a hybrid circuit, wherein the hybrid circuit comprises a tunnel field effect transistor (TFET) and a metal oxide semiconductor field effect transistor (MOSFET), the method comprising: forming a first fin on an upper surface of a substrate in a first active area; forming a second fin on an upper surface of the substrate in a second active area; forming a first gate stack adjacent to a first sidewall of the first fin and a second sidewall of the first fin, the first gate stack comprising a first gate dielectric in contact with the first fin, a first gate electrode, and a first spacer adjacent to and contacting an upper surface of the first gate electrode; forming a second gate stack adjacent to the first sidewall of the second fin and a second sidewall of the second fin, the second gate stack comprising a second gate dielectric in contact with the second fin, a second gate electrode, and a second spacer adjacent to and contacting an upper surface of the second gate electrode; forming a first doped layer and a second doped layer adjacent to and contacting a sidewall of the first fin, the first doped layer and the second doped layer having an upper surface below a lower surface of a first gate stack; forming a third doped layer and a fourth doped layer adjacent to and contacting the second fin, the third doped layer and the fourth doped layer having an upper surface below a lower surface of a second gate stack; forming a fifth doped layer adjacent to and contacting an upper surface of the first fin, a lowest surface of the fifth doped layer being above an uppermost surface of the first gate stack; and forming a sixth doped layer adjacent to and contacting an upper surface of the second fin, a lowest surface of the sixth doped layer being above an uppermost surface of the second gate stack; forming a dielectric layer between the second gate stack and the fifth doped layer to reduce capacitance between the second gate stack and the fifth doped layer;