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Proceedings Paper

Effect of AlSb quantum dots on efficiency of GaAs solar cell (Conference Presentation)
Author(s): Ahmad Mansoori; Sadhvikas J. Addamane; Emma J. Renteria; Darryl M. Shima; Christopher P. Hains; Ganesh Balakrishnan

Paper Abstract

Quantum Dots (QDs) have a broad applications in science and specifically in solar cell. Many research groups show that by adding QDs with lower bandgap respect to host material, the overall absorption of sun spectrum coverage will increase. Here, we propose using QDs with higher band gap respect to host material to improve efficiency of solar cell by improving quantum efficiency. GaAs solar cells have the highest efficiency in single junction solar cells. However, the absorption of GaAs is not good enough in wavelength lower than 550nm. AlSb can absorb shorter wavelength with higher absorption coefficient and also recombination rate should be lower because of higher bandgap of AlSb respect to GaAs. We embed AlSb QDs in GaAs solar cells and results show slight improvement in quantum efficiency and also in overall efficiency. Coverage of AlSb QDs has a direct impact on quality of AlSb QDs and efficiency of cell. In the higher coverage, intermixing between GaAs and AlSb causes to shift bandgap to lower value (having AlGaSb QDs instead of pure AlSb QDs). This intermixing decrease the Voc and overall efficiency of cell. In lower coverage, AlSb can survive from intermixing and overall performance of cell improves. Optimizing growth condition of AlSb QDs is a key point for this work. By using AlSb QDs, we can decrease the thickness of active layer of GaAs solar cells and have a thinner solar cell.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9937, Next Generation Technologies for Solar Energy Conversion VII, 99370A (2 November 2016); doi: 10.1117/12.2238291
Show Author Affiliations
Ahmad Mansoori, The Univ. of New Mexico (United States)
Sadhvikas J. Addamane, The Univ. of New Mexico (United States)
Emma J. Renteria, The Univ. of New Mexico (United States)
Darryl M. Shima, The Univ. of New Mexico (United States)
Christopher P. Hains, The Univ. of New Mexico (United States)
Ganesh Balakrishnan, The Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 9937:
Next Generation Technologies for Solar Energy Conversion VII
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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