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Phosphor Particles for Luminescent Down-Shifting in Photovoltaics: Determination of Complex Refractive Indices
B. Lipovsek, A. Solodovnyk, D. Riedel, A. Osvet, J. Gast, E. Stern, K. Forberich, M. Batentschuk, C.J. Brabec, J. Krc, M. Topic
Organic Solar Cell, Photoluminescence, Photovoltaic (PV), Modelling / Modeling, Optical Properties
Thin Film Photovoltaics
Subtopic: Perovskite, Organic and Dye-Sensitised Devices
Event: 33rd European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BO.12.1
1037 - 1040
ISBN: 3-936338-47-7
Paper DOI: 10.4229/EUPVSEC20172017-3BO.12.1
0,00 EUR
Document(s): paper


We demonstrate a novel two-step method for accurate determination of the complex refractive indices of phosphor materials in particulate form. The real part of the refractive index is first measured at a number of selected wavelengths using the Becke Line method; the results are interpolated over a broader wavelength range using Sellmeier's equations. The imaginary part of the refractive index is extracted from measured optical characteristics of polymer layers embedded with phosphor particles; a specialized numerical simulation tool is employed for this purpose. Finally, using the determined complex refractive indices, we numerically investigate the potential of luminescent down-shifting applied to thin-film solution-processed solar cells. We study the influence of the main properties of luminescent down-shifting layers filled with phosphor particles, and indicate the gains in the solar cell performance that can be obtained using this approach.