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In situ identification of cation-exchange-induced reversible transformations of 3D and 2D perovskites.
Chem Commun (Camb) ; 54(46): 5879-5882, 2018 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-29785421
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.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Chem Commun (Camb) Assunto da revista: Química Ano de publicação: 2018 Tipo de documento: Artigo País de afiliação: Estados Unidos