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Two-dimensional (2D) organic-inorganic hybrid perovskites emerged as a versatile platform for light-emitting and photovoltaic applications due to their unique structural design and chemical flexibility. Their properties depend heavily on both the choice of the inorganic lead halide framework and the surrounding organic layers. Recently, the introduction of chiral cations into 2D perovskites has attracted major interest due to their potential for introducing chirality and tuning the chiro-optical response. Importantly, the optical properties in these materials are dominated by tightly bound excitons that also serve as primary carriers for the energy transport. The mobility of photoinjected excitons is thus important from the perspectives of fundamental material properties and optoelectronic applications, yet remains an open question. Here, we demonstrate exciton propagation in a 2D chiral perovskite methylbenzyl ammonium lead iodide (MBA2PbI4) using transient photoluminescence microscopy and reveal density-dependent transport over more than 100 nanometers at room temperature with diffusion coefficients as high as 2 cm2/s. We observe two distinct regimes of initially rapid diffusive propagation and subsequent localization. Moreover, perovskites with enantiomer pure cations are found to exhibit faster exciton diffusion compared to the racemic mixtures, correlated with the impact of the material composition on disorder. Altogether, the observations of efficient exciton diffusion at room temperature highlight the potential of 2D chiral perovskites to merge chiro-optical properties with strong light-matter interaction and efficient energy transport.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: chiral perovskites, exciton diffusion, transient photoluminescence microscopy

Date published: 2025-03-28

Publisher: Wiley

Journal:

• Advanced Optical Materials (ISSN: 21951071) vol. 13 issue. 11 2402606

Funding:

• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Fundação de Amparo à Pesquisa do Estado de São Paulo 2017/11631‐2
• Fundação de Amparo à Pesquisa do Estado de São Paulo 2018/21401‐7
• Fundação de Amparo à Pesquisa do Estado de São Paulo 2020/04406‐5
• Fundação de Amparo à Pesquisa do Estado de São Paulo 2021/12104‐1
• Sächsisches Staatsministerium für Wissenschaft und Kunst R.8003.22
• Deutsche Forschungsgemeinschaft 390858490

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/adom.202402606

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Updated at: 2026-02-17 12:30:29 +0900

Published on MDR: 2026-02-17 09:11:00 +0900