Patent ID: 9634000
Date: 2017-04-25
CPC Classifications: H01L

Claim:
1. A method for forming a fin-shaped field effect transistor (FinFET) device, with the channel portion of the fins on buried silicon oxide, with source and drain portions of fins on silicon, the method comprising: receiving a wafer, the wafer including a silicon layer electrically isolated from a silicon substrate by a buried oxide (BOX) layer, the BOX layer being in physical contact with the silicon layer and the silicon substrate; forming the fins protruding from the BOX layer stacked along a horizontal direction such that each of the fins is in contact with the BOX layer by forming mandrels, depositing a conformal mandrel spacer around the mandrels, and etching away the conformal mandrel spacer on top of the mandrel, the fins having a fin length; implanting a well in the silicon substrate, the well including a top surface; forming dummy gates over and in contact with the BOX layer, the dummy gates having a dummy gate length that is perpendicular to the fin length; and forming vertical sources and drains over the well between the dummy gates, the vertical sources and drains extending through the BOX layer, fins, and a portion of the dummy gates, the vertical sources and drains physically contacting the top surface of the well.