Investigation of Triple Cation Tin Perovskite Solar Cells
Gregor Trimmel a, Thomas Rath a, Stefan Weber a, Jasmin Handl a, Theodoros Dimopoulos b, Birgit Kunert c
a Institute for Chemistry and Technology of Materials (ICTM), NAWI Graz, Graz University of Technology, Stremayrgasse 9, Graz, 8010, Austria
b AIT Austrian Institute of Technology, Center for Energy, Photovoltaic Systems, Vienna Austria
c Institute of Solid State Physics, Graz University of Technology, Austria
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Gregor Trimmel, 142
Publication date: 11th February 2019

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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