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Proceedings Paper

Computational optimization and solution-processing of thick and efficient luminescent down-shifting layers for photovoltaics
Author(s): Anastasiia Solodovnyk; Christopher Kick; Andres Osvet; Hans-Joachim Egelhaaf; Edda Stern; Miroslaw Batentschuk; Karen Forberich; Christoph J. Brabec
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Paper Abstract

Luminescent down-shifting (LDS) is a simple, powerful tool for increasing the range of solar irradiance that can be efficiently utilized by photovoltaic devices. We developed an optical model to simulate the ideal optical properties (absorbance, transmittance, luminescence quantum yield, etc.) of LDS layers for solar cells. We evaluated which quantum efficiencies and which optical densities are necessary to achieve an improvement in solar cell performance. In particular we considered copper indium gallium diselenide (CIGS) devices. Our model relies on experimentally measured data for the transmission and emission spectra as well as for the external quantum efficiency (EQE) of the solar cell. By combining experimental work with this optical model, we aim to propose an environmentally friendly technology for coating thick (300-500 μm), efficient luminescent down-shifting layers. These layers consist of polyvinyl butyral (PVB) and organic UV-converting fluorescent dyes. The absorption coefficients and luminescence quantum yields of the dyes were determined both in a solution of the solvent benzyl alcohol and in the solid polymer layers. This data shows that the dyes retain luminescence quantum yields of approximately 90% after solution-processing. The produced layers were then applied to CIGS solar cells, thereby improving the EQE of the devices in the UV region. At a wavelength of 390 nm, for instance, the EQE increased from 18% to 53%. These values closely agree with the theoretically calculated ones. The proposed technology, thus, provides a pathway toward efficient, fully solutionprocessable encapsulated photovoltaic modules.

Paper Details

Date Published: 14 March 2016
PDF: 7 pages
Proc. SPIE 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 97430G (14 March 2016); doi: 10.1117/12.2211737
Show Author Affiliations
Anastasiia Solodovnyk, Bayerisches Zentrum für Angewandte Energieforschung e.V. (Germany)
Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Christopher Kick, Bayerisches Zentrum für Angewandte Energieforschung e.V. (Germany)
Andres Osvet, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Hans-Joachim Egelhaaf, Bayerisches Zentrum für Angewandte Energieforschung e.V. (Germany)
Edda Stern, Bayerisches Zentrum für Angewandte Energieforschung e.V. (Germany)
Miroslaw Batentschuk, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Karen Forberich, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Christoph J. Brabec, Bayerisches Zentrum für Angewandte Energieforschung e.V. (Germany)
Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)


Published in SPIE Proceedings Vol. 9743:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V
Alexandre Freundlich; Laurent Lombez; Masakazu Sugiyama, Editor(s)

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