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Calibrated photoluminescence measurements of the upconverter NaYF4:20% ER3+ for silicon solar cells

: Fischer, S.; Goldschmidt, J.C.; Krämer, K.W.; Biner, D.; Hermle, M.; Glunz, S.W.

Fulltext urn:nbn:de:0011-n-1563609 (159 KByte PDF)
MD5 Fingerprint: 2e2cd111e19c13f7e743425e8c0703a2
Created on: 3.8.2012

European Commission:
25th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2010. Proceedings : 5th World Conference on Photovoltaic Energy Conversion, 6-10 , September 2010, Valencia, Spain
München: WIP-Renewable Energies, 2010
ISBN: 3-936338-26-4
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <25, 2010, Valencia>
World Conference on Photovoltaic Energy Conversion <5, 2010, Valencia>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Hochkonversion; Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Farbstoff-; Organische und Neuartige Solarzellen; Alternative Photovoltaik-Technologien; Photonenmanagement; Industrielle und neuartige Solarzellenstrukturen; Neuartige Konzepte

Upconversion (UC) of subband-gap photons is promising to enhance solar cell efficiency. We explore the properties of -NaYF4:20% Er3+ for this application. This material shows efficient UC suitable for semiconductor based solar cells with band gaps up to 1.25 eV. In this work we investigate the optical UC efficiency by calibrated photoluminescence measurements. The values were obtained in dependence of the excitation wavelength as well as the irradiance. The highest optical UC quantum efficiency of 4.3% was obtained for monochromatic irradiance of 1390 Wm- 2 at 1523 nm. Because these data from optical measurements do not account for any losses associated with the application of the upconverter to a solar cell, they represent the upper limit of energy conversion for an optimized solar cell UC device.