Ultrahigh gain hot-electron tunneling transistor approaching the collection limit.

A hot-electron transistor（HET） is a unipolar and majority carrier device with voltage-controlled transport of ballistic hot electrons,and the monochromatic high-energy hot electrons are afforded by the tunnel and filter oxide barriers.The injected hot electrons from the emitter transit through the tunnel barrier with a width below the carrier mean free path（MFP） into the base region and then cross the filter barrier and are finally collected by the collector.