4.6 Article

Femtosecond Transient Absorption Microscopy of Singlet Exciton Motion in Side-Chain Engineered Perylene-Diimide Thin Films

Journal

JOURNAL OF PHYSICAL CHEMISTRY A
Volume 124, Issue 13, Pages 2721-2730

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.0c00346

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Funding

  1. European Research Council under the European Union's Horizon 2020 research and innovation program [670405, 758826]
  2. EPSRC
  3. Winton Program for the Physics of Sustainability
  4. Royal Commission of the Exhibition of 1851
  5. European Research Council (ERC) [670405] Funding Source: European Research Council (ERC)

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We present a statistical analysis of femtosecond transient absorption microscopy applied to four different organic semiconductor thin films based on perylene-diimide (PDI). By achieving a temporal resolution of 12 fs with simultaneous sub-10 nm spatial precision, we directly probe the underlying exciton transport characteristics within 3 ps after photoexcitation free of model assumptions. Our study reveals sub-picosecond coherent exciton transport (12-45 cm(2) s(-1)) followed by a diffusive phase of exciton transport (3-17 cm(2) s(-1)). A comparison between the different films suggests that the exciton transport in the studied materials is intricately linked to their nanoscale morphology, with PDI films that form large crystalline domains exhibiting the largest diffusion coefficients and transport lengths. Our study demonstrates the advantages of directly studying ultrafast transport properties at the nanometer length scale and highlights the need to examine nanoscale morphology when investigating exciton transport in organic as well as inorganic semiconductors.

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