Thin Solid Films of Polyoxometalates-Interfacial Layers in Organic Solar Cells

Anna Proust^a, Ludovic Tortech^a, Qirong Zhu^a, Nick Barrett^c

^aPierre and Marie Curie University (UPMC), Paris Institute of Molecular Chemistry - UMR CNRS 8232, E-POM, 4 place Jussieu, F-75252 Paris Cedex 05, France, Paris, 75252, France

^bCEA Saclay, IRAMIS, NIMBE, LICSEN, F-91191 Gif-sur-Yvette Cedex, France., France

^cCEA Saclay, DSM/IRAMIS/SPEC, F-91191 Gif-Sur-Yvette Cedex, France, France

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Qirong Zhu, 286
Publication date: 5th February 2015

To enhance the performance of organic solar cells (OSC), much effort has been mainly dedicated to the optimization of the donor-acceptor heterojunctions and the band alignment. Polyoxometalates (POMs), which are environmentally friendly molecular oxides with highly tunable structural properties, outstanding electron accepting and transporting properties and attractive optical properties, are promising candidates for interfacial layers in organic solar cells (OSCs).^[1]^[2]^[3] In our work, we present K₆[P₂W₁₈O₆₂], H₆[P₂W₁₈O₆₂], K₆[P₂Mo₁₈O₆₂], which all belong to Wells-Dawson structure, as hole collecting layers in OSCs. To fabricate thin films, POM dissolved in dimethyl sulfoxide (DMSO) is deposited onto tin-doped indium oxide (ITO) by spin-coating and annealed subsequently under suitable conditions. To achieve the optimized interfacial layers, we characterized the surface state by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and ultra-violet photoemission spectroscopy (UPS), and the bulk state by small-angle X-ray scattering (SAXS), Raman spectroscopy and UV-vis spectroscopy. The best interfacial layers were integrated into OSCs and improve the power conversion efficiency of the devices.

[1] M. Alaaeddine, Q. Zhu, D. Fichou, G. Izzet, J. E. Rault, N. Barrett, A. Proust, L. Tortech, Inorg. Chem. 2014, 1, 682. [2] M. Vasilopoulou, A. Soultati, D. G. Georgiadou, T. Stergiopoulos, L. C. Palilis, S. Kennou, N. A. Stathopoulos, D. Davazoglou, P. Argitis, J. Mater. Chem. A 2014, 2, 1738. [3] L. C. Palilis, M. Vasilopoulou, A. M. Douvas, D. G. Georgiadou, S. Kennou, N. A. Stathopoulos, V. Constantoudis, P. Argitis, Sol. Energy Mater. Sol. Cells 2013, 114, 205.

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