Wagener, Magnus C. and Carrington, Peter James and Botha, Johannes Reinhardt and Krier, Anthony (2013) Simulation of the enhanced infrared photoresponse of type-II GaSb/GaAs quantum ring solar cells. Applied Physics Letters, 103 (6). ISSN 0003-6951
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Abstract
The extended photo-response of solar cells containing ten periods of GaSb/GaAs quantum rings imbedded in the p-i-n junction has been described using a single-band representation of the type-II quantum ring structure. By fitting the experimental data, the authors were able to deduce that the quantum rings are well represented by a Gaussian height distribution and a large valence band discontinuity. The simulated band of states is shown to be well matched to the photoluminescence analysis of the structure, with the inhomogeneous size distribution resulting in a band of hole states roughly 390 meV above the valence band.