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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 249 References [1] M.I Asghar, K. Miettunen, J. Halme, P. Vahermaa, M. Toivola, K .Aitola and P. Lund, "Review of stability for advanced dye solar cells", Energy & Environmental Science 2010 3(4) 418-426 [2] M. Carnie, D. Bryant, T. Watson and D. Worsley, "Photocatalytic Oxidation of Triiodide in UVA-Exposed Dye-Sensitized Solar Cells", International Journal of Photoenergy 2012 © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 250 C113 - A monte carlo study of increased charge mobility in molecular hole transporters due to coulomb traps Daniel Staff, Alison Walker University of Bath, University of Bath, Bath, BA2 7AY, GB In the construction of Solid State Dye Sensitized Solar Cells, the addition of redox inactive ionic dopants such as Li-TFSI salt to molecular hole transporters increases the hole mobility 1 . Consequently these cells gain efficiency as holes move away from the interface between the mesoporous TiO2 film acting as electron acceptor and the hole transporter more rapidly and are extracted more readily, reducing recombination. To understand the mechanisms behind the increased hole mobility, we have developed a Monte Carlo model of charge hoping. The hopping sites are potential wells around the anion sites caused by an attractive electrostatic potential. We observe a similar order of magnitude increase in mobility with dopant concentration of a form like that of a insulating/conducting phase transition when the concentration of anions exceeds some critical value. The transition is typified by a change from nearest neighbor site to site hopping and long waiting times in isolated traps to hoping directly between traps with short waiting times in each trap. References [1] Snaith, H.; Grätzel, M. "Enhanced charge mobility in a molecular hole transporter via addition of redox inactive ionic dopant: Implication to dye-sensitized solar cells". Appl. Phys. Lett. 89, 262114 (2006). © SEFIN 2012
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