Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/145997
Title: Origins of the long-range exciton diffusion in perovskite nanocrystal films : photon recycling vs exciton hopping
Authors: Giovanni, David
Righetto, Marcello
Zhang, Qiannan
Lim, Melvin Jia Wei
Ramesh, Sankaran
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2021
Source: Giovanni, D., Righetto, M., Zhang, Q., Lim, M. J. W., Ramesh, S., & Sum, T. C. (2021). Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping. Light: Science & Applications, 10(1), 2-. https://doi.org/10.1038/s41377-020-00443-z
Project: M4080514
M4081630
RG91/19
MOE2016-T2-1-034 
MOE2017-T2-1-001
MOE2017-T2-2-002
NRF-NRFI-2018-04 
NRF-CRP14-2014-03 
Journal: Light, science & applications
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 CH3NH3PbBr3 perovskite nanocrystal (PNC) films. Surprisingly, the resulting exciton mobilities in these PNC films can reach 10 ± 2 cm2 V-1 s-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.
URI: https://hdl.handle.net/10356/145997
ISSN: 2047-7538
DOI: 10.1038/s41377-020-00443-z
DOI (Related Dataset): 10.21979/N9/6QTW2E
Rights: © 2021 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution andreproductionin any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a linktotheCreativeCommons license,and indicate ifchanges were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicatedotherwise in a credit line to the material. Ifmaterial is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtainpermission directly from the copyright holder. To view a copy of this license, visithttp://creativecommons.org/licenses/by/4.0/.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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