Investigation of Cation Exchange Behaviors of FA<sub>x</sub>MA<sub>1−x</sub>PbI<sub>3</sub> Films Using Dynamic Spin-Coating
In this study, we fabricated and characterized uniform multi-cation perovskite FA<sub>x</sub>MA<sub>1−x</sub>PbI<sub>3</sub> films. We used the dynamic spin-coating method to control the cation ratio of the film by gradually increasing the FA+, which replaced the...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/b289592c243c4c3184b41774d42dc3c7 |
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| Sumario: | In this study, we fabricated and characterized uniform multi-cation perovskite FA<sub>x</sub>MA<sub>1−x</sub>PbI<sub>3</sub> films. We used the dynamic spin-coating method to control the cation ratio of the film by gradually increasing the FA+, which replaced the MA+ in the films. When the FA+ concentration was lower than xFA ~0.415 in the films, the stability of the multi-cation perovskite improved. Above this concentration, the film exhibited δ-phase FAPbI<sub>3</sub> in the FA<sub>x</sub>MA<sub>1−x</sub>PbI<sub>3</sub> films. The formation of δ-phase FAPbI<sub>3</sub> disturbed the homogeneity of the photoluminescence spatial distribution and suppressed the absorption spectral bandwidth with the increasing bandgap. The precise control of the cation ratio of multi-cation perovskite films is necessary to optimize the energy-harvesting performance. |
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