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Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

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Abstract

Charge carrier dynamics essentially determines the performance of various optoelectronic applications of colloidal semiconductor nanocrystals. Among them, two-dimensional nanoplatelets provide new adjustment freedom for their unique core/crown heterostructures. Herein, we demonstrate that by fine-tuning the core size and the lateral quantum confinement, the charge carrier transfer rate from the crown to the core can be varied by one order of magnitude in CdSe/CdSeS core/alloy-crown nanoplatelets. In addition, the transfer can be affected by a carrier blocking mechanism, i.e., the filled carriers hinder further possible transfer. Furthermore, we found that the biexciton interaction is oppositely affected by quantum confinement and electron delocalization, resulting in a non-monotonic variation of the biexciton binding energy with the emission wavelength. This work provides new observations and insights into the charge carrier transfer dynamics and exciton interactions in colloidal nanoplatelets and will promote their further applications in lasing, display, sensing, etc.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 61875002), the National Key R&D Program of China (No. 2018YFA0306302), the Bei**g Natural Science Foundation (No. Z190005), and the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (No. KF202208). The author acknowledges the support of the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB36000000), and the National Natural Science Foundation of China (Nos. 11874130 and 22073022), and the support from the DNL Cooperation Fund, CAS (No. DNL202016) of Dalian National Laboratory for Clean Energy.

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  1. Yige Yao and **aotian Bao contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Bei**g, 100871, China

    Yige Yao, Yunke Zhu, An Hu, Peng Bai, Shufeng Wang, Hong Yang & Yunan Gao

  2. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Bei**g, 100190, China

    **aotian Bao, **nyu Sui & **nfeng Liu

  3. University of Chinese Academy of Sciences, Bei**g, 100049, China

    **nfeng Liu

  4. Frontiers Science Center for Nano-optoelectronics, Bei**g, 100871, China

    Shufeng Wang, Hong Yang & Yunan Gao

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

    Shufeng Wang, Hong Yang & Yunan Gao

  6. Peking University Yangtze Delta Institute of Optoelectronics, Nantong, 226010, China

    Shufeng Wang, Hong Yang & Yunan Gao

  7. Dalian National Laboratory for Clean Energy, Dalian, 116023, China

    **nfeng Liu

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Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

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Yao, Y., Bao, X., Zhu, Y. et al. Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets. Nano Res. 16, 10420–10428 (2023). https://doi.org/10.1007/s12274-023-5542-0

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