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Proceedings Paper

Selectivity of fluorescence collectors in a triple tandem systems
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Paper Abstract

We present a photovoltaic tandem system made of two stacked fluorescent collector plates and gallium-indium-arsenide (GaInP), gallium-arsenide (GaAs) and silicon (Si) solar cells, utilizing the spectral selectivity of fluorescent conversion. Fluorescent collectors use fluorescent dye molecules embedded in a dielectric material to collect solar radiation. Incoming radiation is converted into radiation of lower energy, reduced by the Stokes shift energy ΔE. Total internal reflection keeps part of the converted radiation inside the collectors and guides it to the edges of the collector plates, where GaInP and GaAs solar cells are mounted. In order to make use of the spectral selectivity of each collector, the band gap energies Eg of the solar cells at the edges match the energy of dye emission. Optical transmission, reflection and photoluminescence measurements analyze the fluorescent collectors. A spectral transfer matrix formalism allows us to calculate the emitted photon flux of each collector as a function of the absorption/emission properties of the dye and the spectrum of incident radiation. By multiplying the transfer matrices tailored on each collector with the quantum efficiencies of the solar cells, we obtain the particular quantum efficiencies of each collector-cell sub-system and the overall quantum efficiency of the tandem system. The results show very good agreement in the shape of predicted and measured quantum efficiency curves of the tandem system.

Paper Details

Date Published: 18 May 2010
PDF: 8 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 77250R (18 May 2010); doi: 10.1117/12.854174
Show Author Affiliations
Gerda C. Gläser, Univ. Stuttgart (Germany)
Liv Prönneke, Univ. Stuttgart (Germany)

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

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