Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping

David Giovanni; Marcello Righetto; Qiannan Zhang; Jia Wei Melvin Lim; Sankaran Ramesh; Tze Chien Sum

doi:10.1038/s41377-020-00443-z

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Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping

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- Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping
- Light: Science & Applications Vol. 10, Issue 1, Pages: 41-49(2021)
- Affiliations：
  
  1.Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, Singapore 637371, Singapore
  2.Energy Research Institute @NTU (ERI@N), Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, S2-B3a-01, Singapore 639798, Singapore
- Author bio：
  
  Tze Chien Sum (Tzechien@ntu.edu.sg)
- Funds：
- DOI：10.1038/s41377-020-00443-z
  CLC：
- Published：2021，
  
  Published Online：01 January 2021，
  
  Received：19 July 2020，
  
  Revised：13 November 2020，
  
  Accepted：23 November 2020
- Accepted：
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Giovanni, D. et al. Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping. Light: Science & Applications, 10, 41-49 (2021).
DOI：

Giovanni, D. et al. Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping. Light: Science & Applications, 10, 41-49 (2021). DOI： 10.1038/s41377-020-00443-z.

摘要

Abstract

The outstanding optoelectronic performance of lead halide perovskites lies in their exceptional carrier diffusion properties. As the perovskite material dimensionality is reduced to exploit the quantum confinement effects

the disruption to the perovskite lattice

often with insulating organic ligands

raises new questions on the charge diffusion properties. Herein

we report direct imaging of

1 μm exciton diffusion lengths in CH

PbBr

rovskite nanocrystal (PNC) films. Surprisingly

the resulting exciton mobilities in these PNC films can reach 10 ± 2 cm

−1

which is counterintuitively several times higher than the carrier mobility in 3D perovskite films. We show that this ultralong exciton diffusion originates from both efficient inter-NC exciton hopping (via Förster energy transfer) and the photon recycling process with a smaller yet significant contribution. Importantly

our study not only sheds new light on the highly debated origins of the excellent exciton diffusion in PNC films but also highlights the potential of PNCs for optoelectronic applications.

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references

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