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

The Journal of Physical Chemistry. a
Raj PandyaAkshay Rao

Abstract

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 cm2 s-1) followed by a diffusive phase of exciton transport (3-17 cm2 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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Citations

Oct 23, 2020·The Journal of Chemical Physics·Bernd WittmannRichard Hildner
Jun 16, 2021·The Journal of Physical Chemistry. B·Youngseo KimSungnam Park
Jul 27, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Marea J BlakeTessa R Calhoun
Jul 24, 2020·The Journal of Physical Chemistry. a·Libai HuangErik Grumstrup

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Methods Mentioned

BETA
column chromatography
atomic force microscopy
X-ray
AFM
Confocal-like microscopy

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