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Progress on up- and down-converted fluorescence in rare-doped fluorozirconate-based glass ceramics for high efficiency solar cells

: Schweizer, S.; Henke, B.; Ahrens, B.; Paßlick, C.; Miclea, P.T.; Wenzel, J.; Reisacher, E.; Pfeiffer, W.; Johnson, J.A.

Postprint urn:nbn:de:0011-n-1726057 (3.9 MByte PDF)
MD5 Fingerprint: 88c99d9efca033112835236a30a01afd
Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Erstellt am: 16.10.2012

Wehrspohn, R.B. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Photonics for Solar Energy Systems III : 13.-15.4.2010, Brussels, Belgium
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7725)
ISBN: 978-0-8194-8198-6
Paper 77250X
Conference "Photonics for Solar Energy Systems" <3, 2010, Brussels>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWM ()
Fraunhofer CSP ()

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.