Effects of the emitter-base effective-mass difference on the collector current in InP/InGaAs HBTs: A Monte Carlo study
The abrupt heterojunction of InP/InGaAs heterojunction bipolar transistors forms a spike in the conduction band edge, which is responsible for the collector current limitation at mediumhigh bias voltages. Charge transport through the heterojunction interface is usually described, according to Grinbergs model, by thermionic emission and tunnelling transmission, whereas drift-diffusion is assumed in the rest of the device. This model ignores non-local transport effects and fails for narrow bases. We present alternative Monte Carlo simulation results. The simulator includes the exact resolution of Schrdingers equation (avoiding the usual WKB approximation in the transmission coefficient) and takes into account the effective-mass spatial variation.
monte carlo simulation inp/ingaas heterojunction bipolar transistors (hbts) tunnel current electron transmission coefficient transverse kinetic energy