Self-organization and pulsing in multiple quantum well structures excited by infrared radiation

Abstract

Summary form only given. We report ensemble Monte Carlo (MC) particle modeling of nonequilibrium phenomena in multiple quantum well (MQW) structures associated with their excitation by infrared radiation. It is assumed that QWs are uncoupled, so that the vertical transport, of electrons is due to their propagation in continuum states above the inter-well barriers. Such MQW structures are used in QW infrared photodetectors. The response of MQW structures to step-like pulses of high power infrared radiation at constant bias voltage and to step-like pulses of applied voltage at constant intensity of radiation is studied. We consider n-type Al/sub 0.22/Ga/sub 0.78/As-GaAs MQW structures with different numbers of identical doped QWs separated by relatively thick wide-gap undoped layers.