Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.119
Publication date: 18th December 2023
Tin halide perovskites are the main candidate for developing successful non-toxic alternatives to Pb-based materials, with great potential for a variety of applications. However, tin perovskites face serious challenges that originate from their intrinsic chemical characteristics. Apart from the oxidation of Sn(II) component, these materials are known to have limited processability: Their thin films are of lower quality, have a lower defect tolerance, and on top of that their fabrication conditions are strongly restricted to a few substrates and solvents. These aspects are accountable for the stagnation of the efficiency values around 15% in the particular case of tin perovskite solar cells. However, the fundamental properties determining their fast and ineffective crystallization remain essentially unexplored.
In this work, we have defined the factors influencing tin perovskite precursor solution properties the extent of their impact in crystallization. We carried out a comprehensive characterization of solutions in a wide range of solvents, concentrations and compositions, using a novel combination of solution and film characterization techniques, with particular interest on nuclear magnetic resonance and synchrotron-based small-angle X-ray scattering. This study does not only provide detailed instructions for the efficient preparation and processing of tin perovskite solutions, but also introduces critical fundamental information applicable to other metal halide perovskite materials, including other Pb-free ones.
In this work several people participated: Diego Di Girolamo (University of Naples Federico II), Marion Flatken (Helmholtz-Zentrum Berlin), Mahmoud Aldamasy (Helmholtz-Zentrum Berlin), Armin Hoell (Helmholtz-Zentrum Berlin), André Dallmann (Humboldt Universität zu Berlin), Antonio Abate (Helmholtz-Zentrum Berlin).
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