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Long-range exciton transport and slow annihilation in two-dimensional hybrid perovskites

Author

Listed:
  • Shibin Deng

    (Purdue University)

  • Enzheng Shi

    (Purdue University)

  • Long Yuan

    (Purdue University)

  • Linrui Jin

    (Purdue University)

  • Letian Dou

    (Purdue University
    Purdue University)

  • Libai Huang

    (Purdue University)

Abstract

Two-dimensional hybrid organic-inorganic perovskites with strongly bound excitons and tunable structures are desirable for optoelectronic applications. Exciton transport and annihilation are two key processes in determining device efficiencies; however, a thorough understanding of these processes is hindered by that annihilation rates are often convoluted with exciton diffusion constants. Here we employ transient absorption microscopy to disentangle quantum-well-thickness-dependent exciton diffusion and annihilation in two-dimensional perovskites, unraveling the key role of electron-hole interactions and dielectric screening. The exciton diffusion constant is found to increase with quantum-well thickness, ranging from 0.06 ± 0.03 to 0.34 ± 0.03 cm2 s−1, which leads to long-range exciton diffusion over hundreds of nanometers. The exciton annihilation rates are more than one order of magnitude lower than those found in the monolayers of transition metal dichalcogenides. The combination of long-range exciton transport and slow annihilation highlights the unique attributes of two-dimensional perovskites as an exciting class of optoelectronic materials.

Suggested Citation

  • Shibin Deng & Enzheng Shi & Long Yuan & Linrui Jin & Letian Dou & Libai Huang, 2020. "Long-range exciton transport and slow annihilation in two-dimensional hybrid perovskites," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14403-z
    DOI: 10.1038/s41467-020-14403-z
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    Cited by:

    1. Yiyang Gong & Shuai Yue & Yin Liang & Wenna Du & Tieyuan Bian & Chuanxiu Jiang & Xiaotian Bao & Shuai Zhang & Mingzhu Long & Guofu Zhou & Jun Yin & Shibin Deng & Qing Zhang & Bo Wu & Xinfeng Liu, 2024. "Boosting exciton mobility approaching Mott-Ioffe-Regel limit in Ruddlesden−Popper perovskites by anchoring the organic cation," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Arjun Ashoka & Nicolas Gauriot & Aswathy V. Girija & Nipun Sawhney & Alexander J. Sneyd & Kenji Watanabe & Takashi Taniguchi & Jooyoung Sung & Christoph Schnedermann & Akshay Rao, 2022. "Direct observation of ultrafast singlet exciton fission in three dimensions," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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