Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings

Wagener, M. C. and Carrington, P. J. and Botha, J. R. and Krier, A. (2014) Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings. Journal of Applied Physics, 116 (4). ISSN 0021-8979

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Abstract

The optical parameters describing the sub-bandgap response of GaSb/GaAs quantum rings solar cells have been obtained from photocurrent measurements using a modulated pseudomonochromatic light source in combination with a second, continuous photo-filling source. By controlling the charge state of the quantum rings, the photoemission cross-sections describing the two-photon sub-bandgap transitions could be determined independently. Temperature dependent photo-response measurements also revealed that the barrier for thermal hole emission from the quantum rings is significantly below the quantum ring localisation energy. The temperature dependence of the sub-bandgap photo-response of the solar cell is also described in terms of the photo-and thermal-emission characteristics of the quantum rings. (C) 2014 AIP Publishing LLC.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Applied Physics
Additional Information:
Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Journal of Applied Physics, 116 (4), 2014 and may be found at http://dx.doi.org/10.1063/1.4891223
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
73370
Deposited By:
Deposited On:
13 Apr 2015 13:20
Refereed?:
Yes
Published?:
Published
Last Modified:
03 Dec 2020 02:21