Patent ID: 7947557

Claim:
A method for forming a tunneling field effect transistor (TFET), comprising: providing a semiconductor substrate that comprises a first semiconductor material; forming a gate stack over the semiconductor substrate, wherein said gate stack comprises at least a gate dielectric and a gate conductor; doping the semiconductor substrate to form a first doped region and a second doped region in the semiconductor substrate, wherein the first and second doped regions both are doped with a first dopant species of a first conductivity type and are spaced apart from each other by the gate stack; selectively etching the second doped region to form a recess in the semiconductor substrate; selectively forming a semiconductor structure in the recess, wherein said semiconductor structure comprises a second, different semiconductor material of a second, different conductivity type, thereby forming the TFET, which comprises a drain region formed by the first doped region, a source region formed by the semiconductor structure, and a channel region that is located between and defined by the source and drain regions, with the gate stack located over the channel region.