3 years ago

Eu(III)-based nanolayer as highly efficient downshifter for CIGS solar cells

Thomas Fix, Aline Nonat, Loic Charbonnière, Anatolie Gavriluta, Jean-François Guillemoles, abdelilah Slaoui
This work reports on the use of 13 ternary europium(III) complexes as downshifting (DS) material for copper indium gallium selenide (CIGS) solar cells. Their general formula are [Eu(β-Dik)3(NL)x] and [Eu(L)3], where β-Dik = 2-thenoyltrifluoroacetonate, NL are bidentate or monodentate coordinating ligands and L = 4-(4'-tert-butylbiphenyl-4-yl)-2,2'-bipyridine-6-carboxylate. Tris(β-diketonate) ternary Eu(III) complexes are very good candidates for DS applications and some of them have shown very promising results when embedded into a host organic polymer matrix typically used for solar cell encapsulations. Herein we report a new method for the direct deposition of luminescent nanolayer films on the CIGS solar cells. Highly luminescent nano- and micro- layer films of thickness in the 150 nm to 10 µm range have been obtained and characterized by optical microscopy, profilometry, spectrofluorimetry and external quantum efficiency (EQE) measurement analysis. Efficient conversion of incident photons into red light is observed for films with 400 nm to 600 nm thickness, leading to a significant improvement of EQE and the short circuit current density (Jsc) in the UV region by up to 0.81 mA/cm2. The absolute conversion efficiency increases by up to 0.8 %. Except those with naphtyl derivatives, nanofilms were found to be photo-stable and therefore represent a competitive alternative to doped polymer encapsulants.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701112

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