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Formamidinium tin iodide (FASnI3) has emerged as a promising semiconductor material for various optoelectronic applications. However, the structure−photophysical property relationship remains ambiguous, because of the ready occurrence of structural defects in the fragile lattice. Here, using FASnI3 microcrystals synthesized with tailored reaction conditions, we unveil that structural defects can induce bandgap widening and abnormal photoluminescence. Based on combined analysis of X-ray photoelectron spectroscopy, solidstate nuclear magnetic resonance, and optical spectroscopy, we propose that bandgap widening could stem from defect mediated lattice distortion. Temperature-dependent photoluminescence measurements lead us to the discovery of a new near-infrared photoluminescence band between 185 and 10 K and negative thermal quenching in a broad range of 110−200 K. We believe that the knowledge gained here may not only offer a plausible roadmap to prepare high-quality organic−inorganic tin halide perovskite crystals but can also deepen our understanding on the relationship between defects and photophysical properties of tin-based perovskites.

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  This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Materials Letters, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsmaterialslett.4c00860

Keyword: halide perovskite

Date published: 2024-08-05

Publisher: American Chemical Society (ACS)

Journal:

• ACS Materials Letters (ISSN: 26394979) vol. 6 issue. 8 p. 3218-3225

Funding:

• Japan Society for the Promotion of Science 21H01743
• Japan Society for the Promotion of Science 24K01278
• Japan Society for the Promotion of Science 24K01462

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4629

First published URL: https://doi.org/10.1021/acsmaterialslett.4c00860

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Updated at: 2025-06-24 08:30:26 +0900

Published on MDR: 2025-06-24 08:20:45 +0900