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Extremely long-lived charge separation and related carrier spin excitation in CsPbBr3 perovskite quantum dots with an electron acceptor benzoquinone

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Abstract

The formation and evolution dynamics of charge separation (CS) in a complex of CsPbBr3 quantum dots (QDs) and 1,4-benzoquinone (BQ) molecules are measured with a high-sensitive pump-orientation-probe technique by which spin signals of the CS state are monitored. An extraordinarily long-lasting CS is observed, with a characteristic time being up to a dozen days under ambient conditions, due to electron transferring from QDs to BQ molecules. Upon the long-lived CS, spin coherences of both electrons and holes are detected at room temperature, with a spin dephasing time of 420 and 26 ps, respectively. The long-lived CS and spin coherence have important implications for applications of perovskite nanomaterials in photocatalysis, photovoltaics, and spintronics.

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Acknowledgements

The authors thank Dmitri R. Yakovlev for valuable discussions. This work is supported by the National Natural Science Foundation of China (Nos. 12174108, 91950112, 12104311, 12074123, and 12034008).

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Authors and Affiliations

  1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200241, China

    Lin Cheng, Meizhen Jiang, Yumeng Men, Yang Wang, Jinlei Li, Tianqing Jia, Zhenrong Sun & Donghai Feng

  2. College of Sciences, Shanghai Institute of Technology, Shanghai, 201418, China

    Rongrong Hu

  3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Donghai Feng

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  1. Lin Cheng
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  2. Rongrong Hu
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  3. Meizhen Jiang
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Correspondence to Donghai Feng.

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Extremely long-lived charge separation and related carrier spin excitation in CsPbBr3 perovskite quantum dots with an electron acceptor benzoquinone

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Cheng, L., Hu, R., Jiang, M. et al. Extremely long-lived charge separation and related carrier spin excitation in CsPbBr3 perovskite quantum dots with an electron acceptor benzoquinone. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6466-z

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