Resonant tunneling in GaAs/AlGaAs quantum well system for solar photovoltaics

In this paper, we propose a simple and effective method to vary the lowest subband position in a quantum well system. A nearly continuous variation - from the bottom of the quantum well up to a continuous spectrum - can be achieved by inserting a series of thin barriers of host material into a quantum well of fixed width. This technique is technologically simple and promising in a variety of applications, in particular, for aligning the lowest subband position in the sequence of quantum wells in an electric field of an arbitrary configuration, including those typical for p-i-n solar cells.