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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 19 — Jul. 1, 2011
  • pp: 3296–3302

Spectrally selective reflector surfaces for heat reduction in concentrator solar cells: modeling and applications of TiO 2 :Nb-based thin films

Christopher M. Maghanga, Gunnar A. Niklasson, Claes G. Granqvist, and Mghendi Mwamburi  »View Author Affiliations


Applied Optics, Vol. 50, Issue 19, pp. 3296-3302 (2011)
http://dx.doi.org/10.1364/AO.50.003296


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Abstract

The energy conversion efficiency of a conventional p n junction solar cell decreases as the temperature increases, and this may eventually lead to failures in the photovoltaic system, especially if it uses concentrated solar radiation. In this work, we show that spectrally selective reflector (SSR) surfaces can be important for reducing the heat buildup on passively cooled solar cells. We outline a computational scheme for optimizing DC magnetron-sputtered TiO 2 :Nb-based SSRs tailored for silicon solar cells and find good agreement of the reflectance with an experimental realization of the optimal SSR. A figure of merit for SSRs has also been derived and applied to the experimental data.

© 2011 Optical Society of America

OCIS Codes
(310.3840) Thin films : Materials and process characterization
(310.6860) Thin films : Thin films, optical properties
(310.4165) Thin films : Multilayer design
(310.6188) Thin films : Spectral properties
(310.6805) Thin films : Theory and design
(310.7005) Thin films : Transparent conductive coatings

ToC Category:
Materials

History
Original Manuscript: February 28, 2011
Manuscript Accepted: April 25, 2011
Published: June 29, 2011

Citation
Christopher M. Maghanga, Gunnar A. Niklasson, Claes G. Granqvist, and Mghendi Mwamburi, "Spectrally selective reflector surfaces for heat reduction in concentrator solar cells: modeling and applications of TiO2:Nb-based thin films," Appl. Opt. 50, 3296-3302 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-19-3296


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