Patent ID: 8860140

Claim:
A tunneling field effect transistor, comprising: a substrate; a channel region formed in the substrate; a source region and a drain region formed on two sides of the channel region, wherein the drain region is of a first doping type and the source region is of a second doping type, and the first doping type and the second doping type are opposite; a gate stack formed on the channel region, wherein the gate stack comprises: a gate dielectric layer, and at least a first gate electrode and a second gate electrode distributed in a direction from the source region to the drain region and directly formed on the gate dielectric layer, wherein the second gate electrode comprises reactive ions to adjust a work function thereof so that the first gate electrode and the second gate electrode have different work functions, the second gate electrode is a metal electrode, and the reactive ions are selected from the group consisting of Er, Y, Pt, N, O, Cl, F, and combinations thereof; and a first side wall and a second side wall formed on a side of the first gate electrode and on a side of the second gate electrode respectively.