Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Lead halide perovskites are outstanding materials for photovoltaics due to their high efficiencies in solar cells devices. The origin of the long carrier-lifetime in this class of materials is still under debate and, among different hypothesis, the formation of large polarons preventing the recombination of charge couples is one of the most fascinating. In this work, we report a systematic study of the polaron formation process in metal halides perovskites focusing on the influence of the chemical composition of the perovskite on the polaron stabilization energy. We have investigated i) the role of the halide through the analysis of the polarons in iodide and bromide perovskites; ii) the effects of the Sn-doping in mixed and pure metal phases and iii) the indirect effects associated with the cation size and cation’s orientation in the lattice. Our study reveals that polaron formation is promoted by the bond asymmetry, with larger stabilization energies in bromide and low concentration Sn-doped perovskites compared to pure lead / tin iodide perovskites. Other factors like octahedral tilting, the size of organic cations (MA vs. FA) and their orientation in the space, i.e. dipoles, seem to play only a limited role in the process.
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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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