Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Recent progress in the field of hybrid organic-inorganic perovskites for photovoltaics has recently given cells with certified e ciencies of 22.1 % solar to electric power. Up to now, one of their biggest drawbacks remains poor stability towards humidity and temperature. A substitution of the organic CH3NH3 with inorganic Cs yields the extremely stable structure CsPbI3, which however adapts a delta-phase at room-temperature that is not photoactive. Moreover, detailed and unambiguous reports on a partial substitution of the organic cation as in CsxMA1-xPbI3 are lacking in literature. In this study we investigated the exchange of the organic cation by dipping MAPbI3 films into a CsI solution. We incrementally converted the cation in a time-resolved dipping process and analysed the resulting thin-film with UV-Vis, XRD, EDAX, SEM and exfoliation techniques in a high-throughput fashion. Additional in-situ measurements of UV-Vis and XRD allowed us to look at the conversion dynamics. The results showed us two distinctive steps during the conversion. First, small amounts of Cs are incorporated into the structure, preferentially into the mp-layer. As the Cs/MA-ratio approaches 0.2, we see a sudden conversion into the pure CsPbI3 yellow phase, indicating a broad miscibility gap.
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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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