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Melting Temperature Suppression of Layered Hybrid Lead Halide Perovskites via Organic Ammonium Cation Branching

Abstract

Hybrid organic-inorganic lead halide perovskites have attracted broad interest because of their unique optical and electronic properties, as well as good processability. Thermal properties of these materials, often overlooked, can provide additional critical information for developing new methods of thin film preparation using, for example, melt processing—i.e., making films of hybrid perovskites by solidification of a thin layer of the melt liquid. We demonstrate that it is possible to tune the melting temperature of layered hybrid lead iodide perovskites over the range of more than 100 degrees by modifying the structures of alkylammonium-derived organic cations. Via the introduction of alkyl chain branching and extending the length of the base alkylammonium cation, melting temperatures of as low as 172 °C can be achieved and high quality thin films of layered hybrid lead iodide perovskites can be made using a solvent-free melt process with no additives and in ambient air. Additionally, we show that a similar concept can be translated to the corresponding layered bromides, with slightly higher observed melting temperatures. The design rules extablished here can guide the discovery of new melt-processable perovskite materials for low-cost high performance devices.

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Publication details

The article was received on 29 Aug 2018, accepted on 08 Nov 2018 and first published on 09 Nov 2018


Article type: Edge Article
DOI: 10.1039/C8SC03863E
Citation: Chem. Sci., 2019, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Melting Temperature Suppression of Layered Hybrid Lead Halide Perovskites via Organic Ammonium Cation Branching

    T. Li, W. Dunlap-Shohl, E. W. Reinheimer, P. LeMagueres and D. B. Mitzi, Chem. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8SC03863E

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