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Synthesis and Characterization of Lead-Free (CH3)3SSnI3 1-D Perovskite

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We report on the preparation, crystal structure and spectral properties of the trimethylsulfonium tin triiodide perovskite, (CH3)3SSnI3. The air-sensitive lead-free perovskite compound is prepared by reacting the (CH3)3SI and SnI2 solid precursors in evacuated silica tubes at 100°C. According to powder x-ray diffraction and Rietveld analysis, (CH3)3SSnI3 crystallizes at room temperature in hexagonal symmetry and forms a 1D network of face-sharing [SnI6] octahedra along the c axis. UV–Vis reflectance and photoluminescence spectroscopies reveal a direct energy band gap of 2.85 eV accompanied by a weak luminescence signal. Multi-temperature Raman spectroscopy reveals a fully reversible structural phase transition just below 0°C related to the reduction of the unit cell symmetry. Comparison with the widely studied Cs-, CH3NH3- and (NH2)2CH-based 3D-perovskites that are commonly used in third generation solar cells confirms the higher stability of (CH3)3SSnI3. This is attributed to the beneficial role of the bulky trimethylsulfonium group in the ASnI3 structure.

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P. Falaras acknowledges financial support from European Union’s Horizon 2020 (Marie Curie Innovative Training Network MAESTRO/764787). M. Elsenety is financially supported by Science Achievement Scholarship of High Education Ministry of Egypt in cooperation with the Hellenic Ministry of Foreign Affairs for his PhD Scholarship. We also acknowledge support of this work by the project “Development of Materials and Devices for Industrial, Health, Environmental and Cultural Applications” (MIS 5002567) which is implemented under the “Action for the Strategic Development on the Research and Technological Sector”, funded by the Operational Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014-2020) and co-financed by Greece and the European Union (European Regional Development Fund).

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Correspondence to Polycarpos Falaras.

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Kaltzoglou, A., Manolis, G.K., Elsenety, M.M. et al. Synthesis and Characterization of Lead-Free (CH3)3SSnI3 1-D Perovskite. Journal of Elec Materi 48, 7533–7538 (2019). https://doi.org/10.1007/s11664-019-07591-y

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  • Lead-free hybrid perovskite
  • solar cells
  • luminescence
  • phase transitions
  • vibrational properties