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
a ETH – Swiss Federal Institute of Technology Zurich, Department of Mechanical and Process Engineering, Rämistrasse, 101, Zürich, Switzerland
b Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
c Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, via Valleggio 11, I-22100 Como, Italy
d Univ Rennes, INSA Rennes, CNRS, Institut FOTON - UMR 6082, F-35000 Rennes, France
e Center for Nanoscale Materials, Argonne National Laboratory, USA., Argonne Dr, Woodridge, United States
f Department of Chemistry, Northwestern University, Evanston, USA, Sheridan Road, 2145, Evanston, United States
g Istituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, Via Valleggio, 11, Como, Italy
Proceedings of Sustainable Metal-halide perovskites for photovoltaics, optoelectronics and photonics (Sus-MHP)
València, Spain, 2022 December 12th - 13th
Organizers: Teresa S. Ripolles and Hui-Seon Kim
Oral, Dmitry Dirin, presentation 029
Publication date: 15th November 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.

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