Issue 46, 2018

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

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

Supplementary files

Article information

Article type
Communication
Submitted
08 Apr 2018
Accepted
14 May 2018
First published
16 May 2018

Chem. Commun., 2018,54, 5879-5882

Author version available

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, 54, 5879 DOI: 10.1039/C8CC02801J

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