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Citric acid tuned negative thermal quenching of all inorganic copper-based perovskites† † Electronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3ra00279a

ABSTRACT: Copper-based perovskites, with lower electronic dimensions and high photoluminescence quantum yields (PLQY), which are non-toxic and thermally stable, have been reported since 2019 and have immediately attracted great attention. So far, only a few studies have researched the temperature-dependent photoluminescence properties, posing a challenge in ensuring the stability of the material. In this paper, the temperature-dependent photoluminescence properties have been investigated in detail, and a negative thermal quenching of all-inorganic CsCu2I3 perovskites has been studied. Moreover, the negative thermal quenching property can be tuned with the assistance of citric acid, which has not been reported before. The Huang–Rhys factors are calculated to be 46.32/38.31, which is higher than for many semiconductors and perovskites. Citric acid increase induces structure and better crystallinity and more surface defects of copper-based perovskite, resulting in higher luminescence and more surface energy states, which leads to enhanced thermal stability.

SUBMITTER: Yao L

PROVIDER: S-EPMC9923819 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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