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Ultrafast exciton transport at early times in quantum dot solids

Title
Ultrafast exciton transport at early times in quantum dot solids
Author(s)
Zhang, ZhilongSung, JooyoungToolan, Daniel T. W.Han, SanyangPandya, RajWeir, Michael P.Xiao, JamesDowland, SimonLiu, MengxiaRyan, Anthony J.Jones, Richard A. L.Huang, ShujuanRao, Akshay
DGIST Authors
Zhang, ZhilongSung, JooyoungToolan, Daniel T. W.Han, SanyangPandya, RajWeir, Michael P.Xiao, JamesDowland, SimonLiu, MengxiaRyan, Anthony J.Jones, Richard A. L.Huang, ShujuanRao, Akshay
Issued Date
2022-05
Type
Article
Keywords
ENERGY-TRANSFERNANOCRYSTALSPBSDELOCALIZATIONEMISSIONGIANT
ISSN
1476-1122
Abstract
Quantum dot (QD) solids are an emerging platform for developing a range of optoelectronic devices. Thus, understanding exciton dynamics is essential towards developing and optimizing QD devices. Here, using transient absorption microscopy, we reveal the initial exciton dynamics in QDs with femtosecond timescales. We observe high exciton diffusivity (similar to 10(2)cm(2)s(-1)) in lead chalcogenide QDs within the first few hundred femtoseconds after photoexcitation followed by a transition to a slower regime (similar to 10(-1)-1 cm(2)s(-1)). QD solids with larger interdot distances exhibit higher initial diffusivity and a delayed transition to the slower regime, while higher QD packing density and heterogeneity accelerate this transition. The fast transport regime occurs only in materials with exciton Bohr radii much larger than the QD sizes, suggesting the transport of delocalized excitons in this regime and a transition to slower transport governed by exciton localization. These findings suggest routes to control the optoelectronic properties of QD solids.
URI
http://hdl.handle.net/20.500.11750/16930
DOI
10.1038/s41563-022-01204-6
Publisher
Nature Publishing Group
Related Researcher
  • 성주영 Sung, Jooyoung 화학물리학과
  • Research Interests Nanostructured Semiconductor Materials; Advanced Organic Materials; Optoelectronic Properties; Time/Space-resolved Spectroscopy
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Appears in Collections:
Department of Physics and Chemistry FemtoLab for Advanced Energy Materials 1. Journal Articles

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