Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.373
Publication date: 7th February 2022
Two-dimensional organic-inorganic layered perovskites (2DLP) have been widely explored for various exotic properties including chirality and ferroelectricity, along with their excellent optoelectronic functionalities. This is in part because of their highly versatile architecture that is made by intercalated organic-inorganic layers. However, the most explored and celebrated 2DLPs are based on lead as metal cation. Despite the toxicity, these materials are easy to fabricate and show better moisture stability and solvent resistance than other lead-free candidates so far developed. Potential alternatives are Sn2+, Ge, Bi3+, Mn, and Cu2+. Among them, tin has similar electronic configuration and ionic radii5. However, the oxidation of Sn2+ to Sn4+ causes self-doping and structural instability. Moreover, current fabrication protocols require protective atmosphere and relatively high temperature, and they are limited to a very few types of organic cations within inorganic layers, generating emitting structures in the yellow-orange region of the visible spectrum. Here, we develop a facile synthesis protocol for the fabrication of tin-based 2DLP at open air and low temperature, which can be used for various organic cations from the amine family, including heterocyclic ones: octylamine (OctA, used as a reference), and 4-flourobenzylamine (FBA) and phenoxyethylamine (POEA). We show that this simple strategy leads to stable and highly emitting microcrystals of (OctA)2SnBr4 with photoluminescence quantum yield (PLQY) of ca. 80%, which remains above 60% after 50 days storing in the closed vial kept in ambient conditions. While the samples prepared with POEA and FBA exhibit dual broad emission profiles, with POEA PL spectrum centered at 396 nm (P1) and 633 nm (P2) with a notable PLQY of around 15%. Our work paves the way towards highly emitting and stable lead-free layered perovskites with tunable emission by changing the configuration of the organic cations via a simple fabrication protocol.
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