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Proceedings Paper

Progress on up- and down-converted fluorescence in rare-doped fluorozirconate-based glass ceramics for high efficiency solar cells
Author(s): Stefan Schweizer; Bastian Henke; Bernd Ahrens; Christian Paßlick; Paul T. Miclea; Johannes Wenzel; Eduard Reisacher; Wulf Pfeiffer; Jacqueline A. Johnson
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Paper Abstract

Transparent glasses as up- or down-converters are attractive systems to increase the efficiency of solar cells. Er-doped fluorozirconate (FZ) glasses show an intense up-conversion upon excitation at 1540 nm. Transmission spectra show that the absorbance at 1540 nm grows linearly with the Er-doping level. In Eu-doped FZ glasses, which were additionally doped with chlorine ions, the growth of BaCl2 nanocrystals can be observed upon thermal annealing. For high annealing temperatures a phase change from hexagonal to orthorhombic phase BaCl2 can be seen. Upon excitation in the ultraviolet (UV) spectral range these glass ceramics emit an intense blue emission. A combination of a silicon solar cell and an Eu-doped FZ glass ceramic as a down-converting top layer shows an increase in the short circuit current in the UV spectral range compared to a solar cell without a down-converting top layer.

Paper Details

Date Published: 18 May 2010
PDF: 8 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 77250X (18 May 2010); doi: 10.1117/12.853943
Show Author Affiliations
Stefan Schweizer, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Fraunhofer-Ctr. für Silizium-Photovoltaik (Germany)
Bastian Henke, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Fraunhofer-Ctr. für Silizium-Photovoltaik (Germany)
Bernd Ahrens, Fraunhofer-Ctr. für Silizium-Photovoltaik (Germany)
Christian Paßlick, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Paul T. Miclea, Fraunhofer-Ctr. für Silizium-Photovoltaik (Germany)
Martin-Luther-Univ. Halle-Wittenberg (Germany)
Johannes Wenzel, Fraunhofer Institute for Mechanics of Materials (Germany)
Eduard Reisacher, Fraunhofer Institute for Mechanics of Materials (Germany)
Wulf Pfeiffer, Fraunhofer Institute for Mechanics of Materials (Germany)
Jacqueline A. Johnson, The Univ. of Tennessee Space Institute (United States)


Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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