Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
In the last years, tin perovskites have shown to be the most promising alternative to lead perovskites and power conversion efficiency values of above 9% have now been reached. Similar to lead based materials, key parameters for further improvements of tin perovskite solar cells are in the optimisation of the chemical composition by varying both, A-cations as well as the halogenide X-anions as well as in the optimisation of the layer formation. In this contribution, a novel triple cation tin perovskite MA0.75FA0.15PEA0.1SnI3 (methylammonium (MA), formamidinium (FA) and phenylethylammonium (PEA)), which was stabilized with 10% SnF2, was investigated exhibiting superior photovoltaic properties than the corresponding double cation-perovskites in our device setup. In comparison to the FA-PEA compound, this MA rich perovskite has an extended absorption and photocurrent generation up to a wavelength of 1000 nm. Based on the XRD-data, a mixed 2D/3D structure was identified, similar to the already known FA-PEA compound. Also in this material, the processing parameters such as spin coating conditions, anti-solvent dripping, as well as annealing are of crucial importance leading to solar cells with power conversion efficiencies up to 5.0% (measured with a shadow mask) and notably good stability under glovebox conditions. After more than 5000 hours, the devices exhibit still 87% of the initial efficiency. Furthermore, we investigate the incorporation of bromide into this triple cation tin iodide perovskite by the partial substitution of iodide yielding MA0.75FA0.15PEA0.1SnBrxI3−x (x = 0 – 1). As expected, this substitution leads to an increase of the band gap as well as an enhanced open circuit voltage. Increasing the bromide content above x = 1 yields thin films with pinholes resulting in lower device performance and large hysteresis.
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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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