Patent ID: 8803225

Claim:
A tunneling field effect transistor, comprising: a semiconductor substrate and a drain layer formed in the semiconductor substrate, wherein the drain layer is first type heavily doped; an epitaxial layer formed on the drain layer, with an isolation region formed in the epitaxial layer, and the epitaxial layer is first type lightly doped or intrinsic; a buried layer formed in the epitaxial layer, wherein the buried layer is second type lightly doped; a source formed in the buried layer, wherein the source is second type heavily doped; a gate dielectric layer formed on the epitaxial layer, and a gate formed on the gate dielectric layer; and a source metal contact layer formed on the source, and a drain metal contact layer formed under the drain layer, wherein carriers in the buried layer are capable of accumulating by applying a suitable gate voltage during a working process of the tunneling field effect transistor.