Melt Processing of Hybrid Organic-Inorganic Lead Iodide Layered Perovskites
An experiment was conducted to demonstrate that Pb-based hybrid organic−inorganic perovskite (HOIPs) have 25−45 °C higher melting points compared to analogous Sn-based compounds with the same organic cations, i.e., the melting temperatures vary from 200 to 260 °C. The higher temperatures pose an additional challenge for translating the melt-based film deposition from tin(II)- to lead(II)-based HOIPs, without encountering decomposition. as for Sn-based systems, the thermal properties of 2D lead iodide HOIPs can be tailored using the organic cation structure, providing successful candidates that melt below the decomposition temperature. The melting temperatures of Pb-based perovskites are 20−45 °C higher compared to the Sn-based analogues with the same phenethylammonium-based organic cations and melt-processing materials design rules appear to translate from one metal-based system to another. Furthermore, melt processed films of these 2D lead-based HOIPs, prepared in the ambient air and with high phase purity and crystallinity, have been demonstrated for the first time. This demonstration can potentially open up exciting new avenues for device fabrication, such as roll-to-roll techniques and direct lamination or encapsulation of active HOIP films between two substrates.
Li, T; Dunlap-Shohl, WA; Han, Q; Mitzi, DB
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