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      Two-dimensional diffusion of excitons in a perylene diimide monolayer quenched by a fullerene heterojunction

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      Fluorescence_Raw_Data.zip (3.483Mb)
      PTCDI_Raw_AFM_Data.zip (585.1Mb)
      C60_Raw_AFM_Data.zip (523.6Mb)
      PTCDI_C60_Raw_AFM_Data.zip (914.3Mb)
      Notes.txt (1.698Kb)
      Publication date
      2019-05-09
      Creators
      Kerfoot, James
      Metadata
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      Description
      The structural and functional properties of organic heterojunctions play a vitally important role in the operation of organic devices, but their properties are difficult to measure directly due to the buried interfaces which are typically formed. We have grown model heterojunctions consisting of two monolayer-thick organic semiconductors, and to use these bilayers to explore the two-dimensional dynamics of excitons. The heterostructures are formed by sequential deposition of monolayers of perylene-3,4,9,10-tetracarboxylic-3,4,9,10-diimide (PTCDI) and fullerene (C60) on hexagonal boron nitride (hBN). The morphology of these bilayers was characterized using atomic force microscopy and showed clear differences in the C60 growth kinetics on hBN and PTCDI. The variation in the fluorescence of PTCDI-C60 heterostructures with increasing fullerene coverage showed a reduction in intensity consistent with exciton diffusion and quenching. We use a simple model for the intensity dependence to determine the two-dimensional exciton diffusion length in a PTCDI monolayer finding a value of 17 ± 3 nm for this parameter.
      External URI
      • https://rdmc.nottingham.ac.uk/handle/internal/6195
      DOI
      • http://doi.org/10.17639/nott.6188
      Links
      • https://doi.org/10.1021/acs.jpcc.9b01413
      • http://doi.org/10.17639/nott.6188
      Subjects
      • Heterojunctions
      • Heterostructures
      • Heterojunction, Heterostructure, Organic Heteroepitaxy, Exciton Quenching, 2D Materials, Self-Assembly
      • Physical sciences::Physics
      • Q Science::QD Chemistry::QD450 Physical and theoretical chemistry
      • T Technology::TK Electrical engineering. Electronics Nuclear engineering
      Divisions
      • University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
      Research institutes and centres
      • University of Nottingham, UK Campus
      Deposit date
      2019-05-09
      Data type
      Raw data files: AFM images (.ibw), photoluminescence spectra (.ls6 and .txt), optical microscopy images (.jpg)
      Contributors
      • Korolkov, Vladimir V.
      • Svatek, Simon A.
      • Alkhamisi, Manal
      • Parkinson, Patrick W.
      • Beton, Peter
      • Taniguchi, Takashi
      • Watanabe, Kenji
      Funders
      • Engineering & Physical Sciences Research Council
      • Leverhulme Trust
      Grant number
      • EP/N033906/1
      • EP/P019080/1
      • RPG-2016-104
      Data collection method
      Atomic force microscopy, optical microscopy, fluorescence microscopy
      Resource languages
      • en
      Publisher
      The University of Nottingham

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