Inorganic A-site cations improve the performance of band-edge carriers in lead halide perovskites

In lead halide perovskites, organic A-site cations are generally introduced to fine-tune the properties. One of the questions under debate is whether organic A-site cations are essential for high-performance solar cells. In this study, we compare the band edge carrier dynamics and diffusion process...

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Detalles Bibliográficos
Autores principales: Wang, Cheng, Rong, Yaoguang, Wang, Ti
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Higher Education Press 2023
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10519920/
https://www.ncbi.nlm.nih.gov/pubmed/37747592
http://dx.doi.org/10.1007/s12200-023-00078-z
Descripción
Sumario:In lead halide perovskites, organic A-site cations are generally introduced to fine-tune the properties. One of the questions under debate is whether organic A-site cations are essential for high-performance solar cells. In this study, we compare the band edge carrier dynamics and diffusion process in MAPbBr(3) and CsPbBr(3) single-crystal microplates. By transient absorption microscopy, the band-edge carrier diffusion constants are unraveled. With the replacement of inorganic A-site cations, the diffusion constant in CsPbBr(3) increases almost 8 times compared to that in MAPbBr(3). This work reveals that introducing inorganic A-site cations can lead to a much larger diffusion length and improve the performance of band-edge carriers. GRAPHICAL ABSTRACT: [Image: see text] SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12200-023-00078-z.

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