Light-current characteristics of quantum dots with localized recombination

Abstract

We have computed the light-current characteristics of an ensemble of 106 quantum dots with localized Shockley-Read-Hall and radiative recombination between states with integer occupancy. The radiative and nonradiative recombination rates have similar dependences on electron number and, hence, there is no transition from one dominant process to another as the injection is increased. The light-current characteristics of the dot system alone are similar for non-charge-neutral and neutral dots even though the individual recombination rates have very different dependences on electron number. Light emission from the dots as a function of total current shows sublinear behavior due to the wetting layer contribution to the current. © 2005 American Institute of Physics.