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Neodymium-doped fluorochlorozirconate glasses as an upconversion model system for high efficiency solar cells

: Ahrens, B.; Löper, P.; Goldschmidt, J.C.; Glunz, S.; Henke, B.; Miclea, P.T.; Schweizer, S.


Physica status solidi. A 205 (2008), Nr.12, S.2822-2830
ISSN: 0031-8965
ISSN: 1862-6300
ISSN: 1521-396X
ISSN: 1862-6319
Fraunhofer ISE ()
Fraunhofer IWM ()
Fluoreszenzkonzentratoren; upconversion; x-ray diffraction; neodymium; fluorozirconate glass ceramic; barium chloride nanocrystal; erbium-based material; bifacial solar cell

Thermal processing of as-made fluorozirconate glasses which were additionally doped with neodymium and chlorine ions leads to enhanced upconversion fluorescence intensities. The samples were annealed between 240 degrees C and 290 degrees C and the optimum value of upconversion intensity was found for the 270 degrees C sample. The development of glasses doped with Er, whose luminescence characteristics make it a better choice for application as an upconversion layer on silicon solar cells, is in progress. In addition, we present external quantum efficiency measurements of a silicon solar cell with a NaYF4:Er3+ upconverter. We also show a theoretical analysis where erbium transitions can be enhanced selectively to increase upconversion efficiency.