Patent ID: 9318583
Filing Date: 2016-04-19
CPC Classification: H01L

Claim Text:
1. A vertical tunneling field effect transistor, comprising: a vertical core region extending perpendicularly from a semiconductor substrate, the vertical core region having a top surface, the vertical core region comprising a doped outer part and a middle part; a vertical source region of a semiconducting core material comprising the doped outer part of the vertical core region; a vertical drain region of a semiconducting drain material comprising along its longitudinal direction a first drain part and a second drain part, the first drain part either directly surrounding the vertical source region or directly sandwiching the vertical source region between two sub-parts of the first drain part, the second drain part located directly above and in contact with the first drain part, wherein the vertical drain region comprises a doping type which is opposite to a doping type of the vertical source region; a gate dielectric layer directly aside of the first drain part of the vertical drain region; a gate layer directly aside of the gate dielectric layer, the second drain part extending above the gate layer and gate dielectric layer; a drain contact directly connected to a third drain part, the third drain part being an upper part of the second drain part of the vertical drain region; a source contact electrically connected to the vertical source region; a gate contact electrically connected to the gate layer; and a buffer region in between the drain contact and the vertical source region, wherein the third drain part is located in direct contact with and on top of the buffer region.