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In situ identification of cation-exchange-induced reversible transformations of 3D and 2D perovskites

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Abstract

The optical and structural properties of hybrid perovskites can be tuned by the post-synthetic introduction of new cations. To advance the development of this approach, knowledge of the reaction mechanism is essential, but has not yet been elucidated. Here, the effect of n-octylamine on three-dimensional (3D) methylammonium lead bromide (MAPbBr3) was investigated by in situ X-ray photoelectron spectroscopy. Spectroscopic analysis indicated equimolar substitutions between octylammonium (OcA+) and methylammonium (MA+) cations that cause the formation of two-dimensional (2D) octylammonium lead bromide ((OcA)2PbBr4). The introduction of methylamine reversed these changes, and the cation exchange between MA+ and OcA+ caused the reverse conversion to MAPbBr3.

Graphical abstract: In situ identification of cation-exchange-induced reversible transformations of 3D and 2D perovskites

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Publication details

The article was received on 08 Apr 2018, accepted on 14 May 2018 and first published on 16 May 2018


Article type: Communication
DOI: 10.1039/C8CC02801J
Citation: Chem. Commun., 2018, Advance Article
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    In situ identification of cation-exchange-induced reversible transformations of 3D and 2D perovskites

    W. Huang, S. Sadhu, P. Sapkota and S. Ptasinska, Chem. Commun., 2018, Advance Article , DOI: 10.1039/C8CC02801J

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