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Establishing charge-transfer excitons in 2D perovskite heterostructures

Author

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  • Jia Zhang

    (Beijing Jiaotong University
    University of Tennessee)

  • Xixiang Zhu

    (Beijing Jiaotong University
    University of Tennessee)

  • Miaosheng Wang

    (University of Tennessee)

  • Bin Hu

    (University of Tennessee)

Abstract

Charge-transfer excitons (CTEs) immensely enrich property-tuning capabilities of semiconducting materials. However, such concept has been remaining as unexplored topic within halide perovskite structures. Here, we report that CTEs can be effectively formed in heterostructured 2D perovskites prepared by mixing PEA2PbI4:PEA2SnI4, functioning as host and guest components. Remarkably, a broad emission can be demonstrated with quick formation of 3 ps but prolonged lifetime of ~0.5 μs. This broad PL presents the hypothesis of CTEs, verified by the exclusion of lattice distortion and doping effects through demonstrating double-layered PEA2PbI4/PEA2SnI4 heterostructure when shearing-away PEA2SnI4 film onto the surface of PEA2PbI4 film by using hand-finger pressing method. The below-bandgap photocurrent indicates that CTEs are vital states formed at PEA2PbI4:PEA2SnI4 interfaces in 2D perovskite heterostructures. Electroluminescence shows that CTEs can be directly formed with electrically injected carriers in perovskite LEDs. Clearly, the CTEs presents a new mechanism to advance the multifunctionalities in 2D perovskites.

Suggested Citation

  • Jia Zhang & Xixiang Zhu & Miaosheng Wang & Bin Hu, 2020. "Establishing charge-transfer excitons in 2D perovskite heterostructures," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16415-1
    DOI: 10.1038/s41467-020-16415-1
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    Cited by:

    1. Xixiang Zhu & Liping Peng & Jinpeng Li & Haomiao Yu & Yulin Xie, 2021. "Formation of a Fast Charge Transfer Channel in Quasi-2D Perovskite Solar Cells through External Electric Field Modulation," Energies, MDPI, vol. 14(21), pages 1-10, November.

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