Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Dye-sensitized solar cells (DSSCs), which emerged as one of the most promising photovoltaic devices, and have been studied extensively due to their respectable power conversion efficiency (PCE), facile fabrication processes, and potential low cost.[1] The typical DSSC is, in its original form, composed of dye-sensitized nanocrystalline TiO2 film as the working electrode, a Pt-coated conductive glass as the counter electrode, and the redox couple I-/I3- in a volatile organic solvent as the electrolyte. Although power conversion efficiency over 12% has been achieved for DSSCs with a volatile organic liquid electrolyte,[2] DSSCs containing liquid electrolyte are limited for outdoor applications in view of the need for robust encapsulation of the volatile organic liquid. For this reason, considerable efforts have been made to replace the liquid electrolyte with solid state electrolytes, such as p-type inorganic semiconductors (CuI, CuSCN, etc.),[3] organic hole-transporting materials,[4] and ionic conductors.[5]Herein, we report the novel organic solid conducting material, imidazolium (IMI) and benzimidazole (BIMI) iodide synthesized with donor moiety by a three step reaction. The structural characterization of solid materials has been carried out using 1H-NMRspectroscopy. The diffusion coefficient, activation energy, conductivity, redox potentials were determined from various electrochemical techniques. The Cyclic Voltammetry study shows complete reversible behaviour and the alignment of HOMO–LUMO level of solid conductor materials with metal free dye which makes it promising candidate for DSSC. The ss-DSSC with solid electrolytes as anionic conductor is fabricated and characterized by electrochemical methods like I-V, tafel polarization, EIS. The ss-DSSC with single component ionic conductor, shows good stability and efficiency.
References:
(1) O’Regan, B. C.; Gratzel, M. Nature 1991, 353, 737.
(2) Yella,A.; Lee, H-W.; Tsao, H. Nok.; Yi, C.; Chandiran, A. K.;Nazeeruddin, M.; Diau, E. W.-G.; Yeh. C-Y.; Zakeeruddin, S. M.; Gratzel, M. Science 2011, 334, 629.
(3) Kumara, G. R. A.; Okuya, M.; Murakamia, K.; Kaneko,S.; Jayaweera, V. V.; Tennakone, K. J. Photochem. Photobiol. A2004, 164, 183.
(4) Koh, J. K.; Kim, J.; Kim, B.; Kim, J. H.; Kim, E. Adv.Mater.2011, 23, 1641.(5) Wang, G. O.; Wang, L. Zhuo, S. P.; Fang, S. B.; Lin, Y.Chem. Commun.2011, 47, 2700.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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