Publication date: 15th December 2025
Metal halide perovskites (MHPs) have attracted significant interest from the scientific community due to their exceptional optoelectronic properties, making them promising candidates for various applications. Initially recognized for their potential in solar cells, these materials have since demonstrated their versatility, emerging as key components in a range of optoelectronic devices, including photodetectors and light emitters. As research progresses, tin-based MHPs continue to gain attention as a lead-free eco-friendly alternative with the potential to revolutionize multiple fields of optoelectronics.
In this work, the optical properties of the 2D A2SnI4 (A = 4-fluorophenethylammonium (4-FPEA)) perovskite— the first reported ambient-stable tin iodide microcrystals—are investigated. This material was successfully applied in orange-emitting LEDs with improved performance [1]. A detailed optical investigation, including temperature-dependent photoluminescence (PL) and reflectance (R) studies coupled with DFT calculations, enabled us to assign the features observed in the PL and R spectra to specific optical transitions within the band structure. This study presents the first comprehensive resolution of the band structure proposed for this perovskite.
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