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Visualization of exciton transport in ordered and disordered molecular solids

Author

Listed:
  • Gleb M. Akselrod

    (Center for Excitonics, Massachusetts Institute of Technology)

  • Parag B. Deotare

    (Center for Excitonics, Massachusetts Institute of Technology)

  • Nicholas J. Thompson

    (Center for Excitonics, Massachusetts Institute of Technology)

  • Jiye Lee

    (Center for Excitonics, Massachusetts Institute of Technology)

  • William A. Tisdale

    (Center for Excitonics, Massachusetts Institute of Technology)

  • Marc A. Baldo

    (Center for Excitonics, Massachusetts Institute of Technology)

  • Vinod M. Menon

    (Queens College and Graduate Center, The City University of New York)

  • Vladimir Bulović

    (Center for Excitonics, Massachusetts Institute of Technology)

Abstract

Transport of nanoscale energy in the form of excitons is at the core of photosynthesis and the operation of a wide range of nanostructured optoelectronic devices such as solar cells, light-emitting diodes and excitonic transistors. Of particular importance is the relationship between exciton transport and nanoscale disorder, the defining characteristic of molecular and nanostructured materials. Here we report a spatial, temporal and spectral visualization of exciton transport in molecular crystals and disordered thin films. Using tetracene as an archetype molecular crystal, the imaging reveals that exciton transport occurs by random walk diffusion, with a transition to subdiffusion as excitons become trapped. By controlling the morphology of the thin film, we show that this transition to subdiffusive transport occurs at earlier times as disorder is increased. Our findings demonstrate that the mechanism of exciton transport depends strongly on the nanoscale morphology, which has wide implications for the design of excitonic materials and devices.

Suggested Citation

  • Gleb M. Akselrod & Parag B. Deotare & Nicholas J. Thompson & Jiye Lee & William A. Tisdale & Marc A. Baldo & Vinod M. Menon & Vladimir Bulović, 2014. "Visualization of exciton transport in ordered and disordered molecular solids," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4646
    DOI: 10.1038/ncomms4646
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    Cited by:

    1. Raj Pandya & Richard Y. S. Chen & Qifei Gu & Jooyoung Sung & Christoph Schnedermann & Oluwafemi S. Ojambati & Rohit Chikkaraddy & Jeffrey Gorman & Gianni Jacucci & Olimpia D. Onelli & Tom Willhammar &, 2021. "Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    2. Ilia Sokolovskii & Ruth H. Tichauer & Dmitry Morozov & Johannes Feist & Gerrit Groenhof, 2023. "Multi-scale molecular dynamics simulations of enhanced energy transfer in organic molecules under strong coupling," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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