A charge transfer framework that describes supramolecular interactions governing structure and properties of 2D perovskites

Xiaoming Zhao, Melissa L. Ball, Arvin Kakekhani, Tianran Liu, Andrew M. Rappe and Yueh-Lin Loo ()
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Xiaoming Zhao: Princeton University
Melissa L. Ball: Princeton University
Arvin Kakekhani: University of Pennsylvania
Tianran Liu: Princeton University
Andrew M. Rappe: University of Pennsylvania
Yueh-Lin Loo: Princeton University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The elucidation of structure-to-function relationships for two-dimensional (2D) hybrid perovskites remains a primary challenge for engineering efficient perovskite-based devices. By combining insights from theory and experiment, we describe the introduction of bifunctional ligands that are capable of making strong hydrogen bonds within the organic bilayer. We find that stronger intermolecular interactions draw charge away from the perovskite layers, and we have formulated a simple and intuitive computational descriptor, the charge separation descriptor (CSD), that accurately describes the relationship between the Pb-I-Pb angle, band gap, and in-plane charge transport with the strength of these interactions. A higher CSD value correlates to less distortion of the Pb-I-Pb angle, a reduced band gap, and higher in-plane mobility of the perovskite. These improved material properties result in improved device characteristics of the resulting solar cells.

Date: 2022
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DOI: 10.1038/s41467-022-31567-y

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