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oai:docta.ucm.es:20.500.14352/1084312025-09-15T15:46:54Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Gelmetti, Ilario author Montcada, Núria author Pérez-Rodríguez, Ana author Barrena, Esther author Ocal, Carmen author García Benito, Inés author Molina Ontoria, Agustín author Martín León, Nazario author Vidal-Ferran, Anton author Palomares, Emilio author 2019 In this work, we assess the possible reasons for the differences observed in open circuit voltage (VOC) in mixed cation perovskite solar cells when comparing four different hole transport materials (HTMs), namely TAE-1, TAE-3, TAE-4 and spiro-OMeTAD. All these HTMs present close chemical and physical properties, however, once they are finally deposited onto the perovskite layer, the HTMs provide different performance characteristics. Additional to the evaluation of the HTM influence on recombination, we find that, upon deposition of the organic HTM on top of the perovskite, there is an important change in the energy level position, and the impact on the device VOC is discussed. We consider that this experimental observation could be general for other organic HTMs and would justify the difficulties in finding molecules and materials that could improve the efficiency of perovskite solar cells overcoming the solar-to-energy conversion efficiency of solar cells made using spiro-OMeTAD as a hole selective contact. Gelmetti, Ilario, et al. «Energy Alignment and Recombination in Perovskite Solar Cells: Weighted Influence on the Open Circuit Voltage». Energy & Environmental Science, vol. 12, n.o 4, 2019, pp. 1309-16. https://doi.org/10.1039/C9EE00528E. 1754-5692 10.1039/c9ee00528e https://hdl.handle.net/20.500.14352/108431 1754-5706 https://doi.org/10.1039/C9EE00528E Energy alignment and recombination in perovskite solar cells: weighted influence on the open circuit voltage