Intrinsic formamidinium tin iodide nanocrystals by suppressing the Sn(IV) impurities

Dmitry Dirin^a^,^b, Anna Vivani^c, Marios Zacharias^d, Ihor Cherniukh^a^,^b, Sergii Yakunin^a^,^b, Federica Bertolotti^c, Marcel Aebli^a^,^b, Richard Schaller^e^,^f, Norberto Masciocchi^c, Antonietta Guagliardi^g, Laurent Pedesseau^d, Jacky Even^d, Maksym Kovalenko^a^,^b, Maryna Bodnarchuk^a^,^b

^aDepartment of Chemistry and Applied Biosciences, ETHZ

^bLaboratory of Thin Films and Photovoltaics, Empa — Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse, 129, Dübendorf, Switzerland

^cDipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, via Valleggio 11, I-22100 Como, Italy

^dUniv Rennes, INSA Rennes, CNRS, Institut FOTON - UMR6082, France, France

^eCenter for Nanoscale Materials, Argonne National Laboratory, USA., Argonne Dr, Woodridge, United States

^fDepartment of Chemistry, Northwestern University, Evanston, USA, Sheridan Road, 2145, Evanston, United States

^gIstituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, via Valleggio 11, I-22100 Como, Italy

Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM22)

Materials for next generation LEDs and lasers:

Limasol, Cyprus, 2022 October 3rd - 5th

Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Grigorios Itskos

Oral, Dmitry Dirin, presentation 004
DOI: https://doi.org/10.29363/nanoge.emlem.2022.004
Publication date: 15th July 2022

Lead halide perovskites successfully advance towards applications in solar cells, light-emitting devices, and high-energy radiation detectors. Recent progress in understanding their uniqueness highlights the role of optoelectronic tolerance to intrinsic defects, particularly long diffusion lengths of carriers, and highly dynamic 3d inorganic framework. This picture indicates that finding an analogous material among non-group-14 metal halides can be very challenging, if possible at all. On the other hand, Sn (II) iodide perovskites exhibit comparably good performance in photovoltaics when synthesized with a low number of trap states. The main challenge with this material originates from the easiness of the trap states generation, which are typically ascribed to the oxidation of Sn(II) to Sn(IV). In this work, we describe the synthesis of colloidal monodisperse FASnI3 NCs, wherein thorough care on the purity of precursors and redox chemistry reduces the concentration of Sn(IV) to an insignificant level, to probe the intrinsic structural and optical properties of these NCs.

Acknowledgements:

This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 862656 (project DROP-IT). This work was also partially supported by MIUR (PRIN-2017L8WW48, Project HY-TEC) and by the U.S. Department of Energy, Office of Science (Contract No. DE-AC02-06CH11357). The authors acknowledge the support of the Electron Microscopy Center at Empa, the scientific and technical staff of the MS-X04A beamline of the Swiss Light Source at Paul Scherrer Institute (Villigen, CH), Dr. Martin Kotyrba for the help with the distillation in ultrahigh vacuum and Prof. Christophe Coperet for providing the Mashima’s reagent.

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