CURRENT GAINS OF ALAS/GAAS TUNNELING EMITTER BIPOLAR-TRANSISTORS WITH 25-500-ANGSTROM BARRIER THICKNESS

Abstract

The current gain of an AlAs/GaS tunnelling emitter bipolar transistor (TEBT) is found to increase monotonically with barrier thickness in the range 25-200 angstrom and fall off for barrier thickness increasing from 200 to 500 angstrom. It is found that a thicker barrier can suppress the base-to-emitter hole injection better and increase the current gain, but a barrier which is too thick decreases the current gain due to the suppression of the electron current.