Patent ID: 8072012

Claim:
A tunnel field effect transistor comprising: at least one elongate monocrystalline nanostructure, said elongate monocrystalline nanostructure comprising a first section comprising a first semiconductor material having a first lattice constant and a heterosection comprising a second semiconductor material having a different lattice constant from the first semiconductor material and wherein: at least one of a source region and a drain region of the elongate monocrystalline nanostructure is situated in the first section and is highly doped according to a first conductivity type; at least one of the source region and the drain region of the elongate monocrystalline nanostructure is situated in the heterosection and is highly doped according to a second conductivity type, and wherein an interface between a main part of the elongate monocrystalline nanostructure and the heterosection is substantially defect-free; a channel region is situated adjacent to the heterosection and comprises the first semiconductor material which is lowly doped according to the first conductivity type or lowly doped according to the second conductivity type and is situated between the source region and drain region; and a gate structure is on the channel region of the elongate monocrystalline nanostructure, the gate structure comprising a gate dielectric with a gate contact on top of the gate dielectric.