Two-Dimensional Diffusion of Excitons in a Perylene Diimide Monolayer Quenched by a Fullerene Heterojunction

James Kerfoot, Vladimir V. Korolkov, Simon A. Svatek, Manal Alkhamisi, Takashi Taniguchi, Kenji Watanabe, Patrick W. Parkinson, Peter H. Beton

    Research output: Contribution to journalArticlepeer-review


    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 that are typically formed. We have grown model heterojunctions consisting of two monolayer-thick organic semiconductors and used 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 (C 60 ) on hexagonal boron nitride (hBN). The morphology of these bilayers was characterized using atomic force microscopy and showed clear differences in the C 60 growth kinetics on hBN and PTCDI. The variation in the fluorescence of PTCDI-C 60 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.

    Original languageEnglish
    Pages (from-to)12249-12254
    Number of pages6
    JournalJournal of Physical Chemistry C
    Issue number19
    Early online date16 May 2019
    Publication statusPublished - 2019


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