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Mixed-Halide Double Perovskite Cs2 AgBiX6 (X=Br, I) with Tunable Optical Properties via Anion Exchange.


ABSTRACT: Lead-free double perovskites, A2 M+ M'3+ X6 , are considered as promising alternatives to lead-halide perovskites, in optoelectronics applications. Although iodide (I) and bromide (Br) mixing is a versatile tool for bandgap tuning in lead perovskites, similar mixed I/Br double perovskite films have not been reported in double perovskites, which may be due to the large activation energy for ion migration. In this work, mixed Br/I double perovskites were realized utilizing an anion exchange method starting from Cs2 AgBiBr6 solid thin-films with large grain-size. The optical and structural properties were studied experimentally and theoretically. Importantly, the halide exchange mechanism was investigated. Hydroiodic acid was the key factor to facilitate the halide exchange reaction, through a dissolution-recrystallization process. In addition, the common organic iodide salts could successfully perform halide-exchange while retaining high mixed-halide phase stability and strong light absorption capability.

SUBMITTER: Wu H 

PROVIDER: S-EPMC8596517 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Mixed-Halide Double Perovskite Cs<sub>2</sub> AgBiX<sub>6</sub> (X=Br, I) with Tunable Optical Properties via Anion Exchange.

Wu Hua H   Erbing Axel A   Johansson Malin B MB   Wang Junxin J   Kamal Chinnathambi C   Odelius Michael M   Johansson Erik M J EMJ  

ChemSusChem 20210902 20


Lead-free double perovskites, A<sub>2</sub> M<sup>+</sup> M<sup>'3+</sup> X<sub>6</sub> , are considered as promising alternatives to lead-halide perovskites, in optoelectronics applications. Although iodide (I) and bromide (Br) mixing is a versatile tool for bandgap tuning in lead perovskites, similar mixed I/Br double perovskite films have not been reported in double perovskites, which may be due to the large activation energy for ion migration. In this work, mixed Br/I double perovskites were  ...[more]

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