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Issue 27, 2017
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Tuning the chemical properties of europium complexes as downshifting agents for copper indium gallium selenide solar cells

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Abstract

New europium(III) β-diketonate based complexes with the general formula [Eu(β-Dik)3(NL)x], where β-Dik = 2-thenoyltrifluoroacetonate, 4,4,4-trifluoro-1-phenyl-1,3-butanedione, 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione, NL = diphenyl sulfoxide (x = 2), bis[2-(diphenylphosphino)phenyl] ether oxide (x = 1), triphenylphosphine oxide (x = 2), 5,6-epoxy-5,6-dihydro-[1,10]phenanthroline (x = 1), are designed and synthesized. The coordination complexes are comprehensively characterized by elemental analysis, infrared and 1H, 13C and 19F NMR spectroscopy. The complexes are embedded into poly(ethylene-co-vinyl acetate) (EVA), poly(methyl methacrylate) (PMMA) or poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVB) matrices. Photoluminescence behavior is investigated in detail and it exhibits the characteristic 5D07F0–4 emission bands with quantum yields of 55–83% in the solid state and 34–86% in the polymers. Encapsulation of CIGS solar cells with luminescent downshifting (LDS) layers results in an important improvement of external quantum efficiency (EQE) in the UV region, from 14% and up to 58% at 360 nm for the best compound. The short circuit current density (Jsc) in the range of 300–400 nm increases up to 0.77 mA cm−2 for the best LDS which corresponds to 71% of the Jsc enhancement of an ideal downshifter. IV measurements follow the spectral response data with an absolute increase in conversion efficiency of up to 0.8%.

Graphical abstract: Tuning the chemical properties of europium complexes as downshifting agents for copper indium gallium selenide solar cells

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Publication details

The article was received on 03 Apr 2017, accepted on 05 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02892J
Citation: J. Mater. Chem. A, 2017,5, 14031-14040
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    Tuning the chemical properties of europium complexes as downshifting agents for copper indium gallium selenide solar cells

    A. Gavriluta, T. Fix, A. Nonat, A. Slaoui, J. Guillemoles and L. J. Charbonnière, J. Mater. Chem. A, 2017, 5, 14031
    DOI: 10.1039/C7TA02892J

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