Clear negative characteristics observed in coupled-quantum-wellbase resonant tunneling transistors

Clear negative resistance characteristics observed in a resonant tunneling transistor with a coupled-quantum-well (CQW) base are reported. The collector current reveals negative resistance properties with respect not only to the base-emitter voltage but also the base current in the common-emitter configuration. The collector current peak-to-valley ratio is enhanced in the CQW-base transistor compared with a reference transistor with a single-quantum-well (SQW) base