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Connecting the solution chemistry of PbI2 and MAI: a cyclodextrin-based supramolecular approach to the formation of hybrid halide perovskites

Abstract

The evolution from solvated precursors to hybrid halide perovskite film dictates most of the photo-physical and optoelectronic prerogatives of the final polycrystalline material. Specifically, the complex equilibria and the importantly different solubility of lead iodide (PbI2) and methylammonium iodide (MAI) induces an inhomogeneous crystal growth often leading to a defects dense film, showing non optimal optoelectronic properties and intrinsic instability. Here, we explore a supramolecular approach based on the use of cyclodextrins (CDs) to modify the underlying solution chemistry. The peculiar phenomenon demonstrated is a tunable complexation between different CDs and MA+ cation concurrent to an out of cage PbI2 intercalation, noticeably the first report of a connection between the solvation equilibria of the two perovsktie precursors. Identified the optimal conditions in terms of CDs cavity size and polarity, those translate in a neat enhancement of the PbI2 solubility in the reaction media, leading to an equilibration of the precursors availability in solution. The macroscopic result is an improved nucleation process, leading to a perovskite material with higher crystallinity, better optical properties and improved moisture resistance. Remarkably, the use of CDs foresees a great potential for a wide range of device-related applications, as well as for the development of tailored composite materials.

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Publication details

The article was received on 29 Nov 2017, accepted on 12 Feb 2018 and first published on 12 Feb 2018


Article type: Edge Article
DOI: 10.1039/C7SC05095J
Citation: Chem. Sci., 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Connecting the solution chemistry of PbI2 and MAI: a cyclodextrin-based supramolecular approach to the formation of hybrid halide perovskites

    S. Colella, S. Masi, F. Aiello, A. Listorti, F. Balzano, D. Altamura, C. Giannini, R. Caliandro, G. Uccello-Barretta and A. Rizzo, Chem. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C7SC05095J

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