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

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 1 H, 13 C, 19 F 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 exhibits the characteristic 5 D0→ 7 F0-4 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) layer 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. I-V measurements follow the spectral response data with an absolute increase in conversion efficiency of up to 0.8 %.
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Anatolie Gavriluta, Thomas Fix, Aline Nonat, Abdelilah Slaoui, Jean-Francois Guillemoles, et al.. Tuning the chemical properties of europium complexes as downshifting agents for copper indium gallium selenide solar cells. Journal of Materials Chemistry A, Royal Society of Chemistry, inPress, 5 (27), pp.14031-14040. ⟨10.1039/x0xx00000x⟩. ⟨hal-01972837⟩

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