A novel GaAs-based tunnel field-effect transistor without drain junction is proposed to improve the on-state current and its performance is investigated.The transistor uses N-type InGaAs with the same doping concentration in the channel and drain to form junctionless channel/drain and to simplify the manufacture process,while P-type GaAsSb is used in the source to produce hetero junction source/channel and to increase the on-state current.The widened tunnel barrier in the off-state decreases the leakage cur...