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Up-conversion materials for enhanced efficiency of solar cells

 
: Goldschmidt, J.C.; Fischer, S.; Steinkemper, H.; Herter, B.; Wolf, S.; Hallermann, F.; Plessen, G. von; Johnson, J.; Ahrens, B.; Miclea, P.-T.; Schweizer, S.

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Wehrspohn, R.B.:
Photon management in solar cells
Weinheim: Wiley-VCH, 2015
ISBN: 3-527-41175-5
ISBN: 978-3-527-41175-7 (Print)
ISBN: 978-3-527-66569-3
ISBN: 978-3-527-66568-6
ISBN: 978-3-527-66567-9
ISBN: 978-3-527-66566-2 (Online)
pp.231-254
English
Book Article
Fraunhofer ISE ()
Fraunhofer CSP ()
Fraunhofer IWM ()
Solarzellen - Entwicklung und Charakterisierung; Farbstoff; Organische und Neuartige Solarzellen; Photonenmanagement; upconversion

Abstract
Owing to the discrete band-gap energy of the employed semiconductor material, solar cells generally do not utilize sub-band-gap photons. This chapter investigates up-converter materials based on lanthanides. The trivalent lanthanide ions have a rich energy spectrum from the near infrared (NIR) to the ultra violet spectral region which makes them prominent for many optical applications, like spectral conversion. Trivalent erbium (Er3+) shows conveniently spaced energy levels for up-conversion (UC) of photons around 1520 nm. The chapter describes the potential of transparent erbium-doped fluorozirconate (FZ) glasses as attractive UC systems. Another material is trivalent erbium doped hexagonal sodium yttrium fluoride. Both materials are very suitable up-converters that show high UC quantum yield and emission/absorption characteristics that match the spectral characteristics of silicon solar cells. The UC efficiencies are simulated on the basis of a rate equation model.

: http://publica.fraunhofer.de/documents/N-345511.html