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Investigation of electronic excited states in single-molecule junctions

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Abstract

The investigation of electronic excited states in single-molecule junctions not only provides platforms to reveal the photophysical and photochemical processes at the molecular level, but also brings opportunities for the development of single-molecule optoelectronic devices. Understanding the interaction mechanisms between molecules and nanocavities is essential to obtain on-demand properties in devices by artificial design, since molecules in junctions exhibit unique behaviors of excited states benefited from the structures of metallic nanocavities. Here, we review the excitation mechanisms involved in the interplay between molecules and plasmonic nanocavities, and reveal the influence of nanostructures on excited-state properties by demonstrating the differences in excited state decay processes. Furthermore, vibronic transitions of molecules between nanoelectrodes are also discussed, offering a new single-molecule characterization method. Finally, we provide the potential applications and challenges in single-molecule optoelectronic devices and the possible directions in exploring the underlying mechanisms of photophysical and photochemical processes.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22173075, 21933012 and 31871877), the National Key R&D Program of China (No. 2017YFA0204902), the Fundamental Research Funds for the Central Universities (Nos. 20720200068 and 20720190002), and the Beijing National Laboratory for Molecular Sciences (No. BNLMS202005).

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  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Wei Xu, Ruihao Li, Chenhao Wang, Jiahe Zhong, Junyang Liu & Wenjing Hong

  2. Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China

    Junyang Liu & Wenjing Hong

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  1. Wei Xu
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Xu, W., Li, R., Wang, C. et al. Investigation of electronic excited states in single-molecule junctions. Nano Res. 15, 5726–5745 (2022). https://doi.org/10.1007/s12274-022-4102-3

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