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Proceedings Paper

Trivalent rare-earth ions as photon down-shifter for photovoltaic applications
Author(s): Franziska Steudel; Sebastian Loos; Bernd Ahrens; Stefan Schweizer
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Paper Abstract

Rare-earth doped borate glasses are investigated for their potential as photon down-shifting cover glass for CdTe solar cells. Note, that CdTe solar cells have a poor response in the ultraviolet and blue spectral range due to absorption in the CdS buffer layer having a band gap of 2.4 eV. The following trivalent rare-earth ions are analyzed in detail: Sm3+, Eu3+, and Tb3+. These ions provide strong absorption bands in the ultraviolet / blue spectral range and an intense emission in the red (Sm3+ and Eu3+) or green (Tb3+) spectral range. The gain in short-circuit current density of a CdTe solar cell is calculated for different rare-earth ion concentrations. The calculations are based on the rare-earth’s absorption coefficients as well as their photoluminescence (PL) quantum efficiency. For Sm3+, the PL quantum efficiency depends significantly on the doping concentration. Finally, the potential of double-doped borate glasses, i.e. glasses doped with two different rare-earth ions, is investigated.

Paper Details

Date Published: 15 May 2014
PDF: 7 pages
Proc. SPIE 9140, Photonics for Solar Energy Systems V, 91400I (15 May 2014); doi: 10.1117/12.2052185
Show Author Affiliations
Franziska Steudel, Fraunhofer-Institut für Werkstoffmechanik (Germany)
Sebastian Loos, Fachhochschule Südwestfalen (Germany)
Bernd Ahrens, Fraunhofer-Institut für Werkstoffmechanik (Germany)
Fachhochschule Südwestfalen (Germany)
Stefan Schweizer, Fraunhofer-Ctr. für Silizium-Photovoltaik (Germany)
Fachhochschule Südwestfalen (Germany)

Published in SPIE Proceedings Vol. 9140:
Photonics for Solar Energy Systems V
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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