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Paritmongkol et al - 2D perovskite structure - ChemRxiv 2019.pdf (3.77 MB)
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Synthetic Variation and Structural Trends in Layered Two-Dimensional Alkylammonium Lead Halide Perovskites

preprint
submitted on 03.04.2019 and posted on 03.04.2019 by Watcharaphol Paritmongkol, Nabeel Dahod, Nannan Mao, Shao-Liang Zheng, William Tisdale
We report the cooling-induced crystallization of layered two-dimensional lead halide perovskites with controllable inorganic quantum-well thickness (n = 1, 2, 3, 4), organic spacer chain length (butyl-, pentyl-, hexylammonium), A-site cation (methylammonium, formamidinium), and halide anion (iodide, bromide). We report crystal structures for the iodide family as a function of these compositional parameters, and across their temperature dependent phase transitions. In general, lower symmetry crystal structures, increasing extents of organic-spacer interdigitation, and increasing organic-spacer corrugation tilts are observed at low temperature. In addition, greater structural distortions are seen in lead halide octahedra closest to the organic spacer layer, and larger-structures exhibit periodic variation in Pb-I bond lengths. We also provide detailed guidance regarding the combination of synthetic parameters needed to achieve phase-pure crystals of each composition, and discuss difficulties encountered when trying to synthesize particular members of the 2D perovskite family containing formamidinium or cesium as the A-site cation. These results provide a foundation for understanding structural trends in 2D lead halide perovskites and the effect these trends have on their thermal, electrical, and optical properties.

Funding

U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, DE-SC0019345

History

Email Address of Submitting Author

tisdale@mit.edu

Institution

Massachusetts Institute of Technology

Country

USA

ORCID For Submitting Author

0000-0002-6615-5342

Declaration of Conflict of Interest

No conflicts of interest to declare

Version Notes

version 1.0

Exports