Environmentally friendly and low cost method for the elaboration of conducting polymers as hole transporting material for solid state dye sensitized solar.

Mohamed Jouini^a, Mohamed M Chehimi^a, Christian Perruchot^a, Adel Jarboui^a, Annette Delices^a, Anders Hagfeldt^b, Nick Vlachopoulos^b, Lei Yang^b, Jinbao Zhang^b, Vibha Saxena^c, Dinesh Aswal^c

^aUniv Paris Diderot, Sorbone Paris Cité, ITODYS, UM, 15, rue Jean de Baif, Paris cedex 13, 75205

^bUppsala University, Ångström Laboratory, Sweden, Lägerhyddsvägen, 1, Uppsala, Sweden

^cTechnical Physics Division, Bhabha Atomic Research Centre, BARC, Mumbai 400085, India.

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

Oral, Mohamed Jouini, presentation 015
Publication date: 5th February 2015

Conversion of sunlight into electricity through photovoltaic solar cells is of high interest for the reduction of greenhouse gases and the replacement of the fossil fuels. The low-cost production of new organic and hybrid materials for photovoltaic cells by soft chemistry such as electrodeposition method is timely and relevant. The electro-deposition or photo-deposition (PD) of organic conducting polymers (CPs) are easy to develop and of low-cost. Therefore, CPs are used as hole transporting material (HTM) to replace I₃^-/ I^-couple in Grätzel cells (dye-sensitized-solar-cells, DSCs). The efficiency for DSCs based on PEDOT (Poly(3,4-ethylene dioxythiophene)), photo-deposited in-situ in organic solvent on dye-modified TiO2 electrode was 2% [1]. So far the in-situ PD method had two major drawbacks: 1) the use of organic solvent to solubilize the monomers with the risk to solubilize the dye adsorbed on TiO₂ surface and 2) difficulty of using simple commercial monomers (such EDOT), their oxidation potential is higher than that of the dye. We present a methodology that allowed us to overcome these drawbacks and which consists to use water as solvent. In aqueous medium, we performed in-situ photo-deposition of PEDOT on a dye modified TiO₂ electrode [2], from the low-cost EDOT instead of Bis-EDOT monomer previously used by researchers [1]. The DSCs achieved using PEDOT obtained in aqueous media are more efficient [2] than those based on the PEDOT obtained from Bis-EDOT in organic medium [1]. This method is environmentally friendly, easy to implement and the cost of the cells can be reduced drastically when using an organic dye of low-cost synthesis. Work on the subject is in progress. Moreover, the benefits in terms of thermodynamics and kinetics of the photo-polymerization reaction arising from the use of the water solvent will be presented.

[1]. J. Xia et al., J. Am. Chem. Soc. 2008, 130, 1258-1263. [2]. J. Zhang et al.; J. Phys. Chem. Let. 2013, 4(23), 4026-4031 and L. Yang et al.; J Phys. Chem. C 2014, 118(30), 16591-16601.

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