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  • Open circuit voltage increase of GaSb-GaAs quantum ring solar cells under high hydrostatic pressure

    Rights statement: This is the author’s version of a work that was accepted for publication in Solar Energy Materials and Solar Cells. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy Materials and Solar Cells, 187, 2018 DOI: 10.1016/j.solmat.2018.07.028

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    Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License

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Open-circuit voltage increase of GaSb/GaAs quantum ring solar cells under high hydrostatic pressure

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>1/12/2018
<mark>Journal</mark>Solar Energy Materials and Solar Cells
Issue number1
Volume187
Number of pages6
Pages (from-to)227-232
Publication statusPublished
Early online date9/08/18
Original languageEnglish

Abstract

Hydrostatic pressure can be used as a powerful diagnostic tool to enable the study of lattice dynamics, defects, impurities and recombination processes in a variety of semiconductor materials and devices. Here we report on intermediate band GaAs solar cells containing GaSb quantum rings which exhibit a 15% increase in open-circuit voltage under application of 8 kbar hydrostatic pressure at room temperature. The pressure coefficients of the respective optical transitions for the GaSb quantum rings, the wetting layer and the GaAs bulk, were each measured to be ~10.5±0.5 meV/kbar. A comparison of the pressure induced and temperature induced bandgap changes highlights the significance of the thermal energy of carriers in intermediate band solar cells.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Solar Energy Materials and Solar Cells. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy Materials and Solar Cells, 187, 2018 DOI: 10.1016/j.solmat.2018.07.028