Excitonic coupling dominates the homogeneous photoluminescence excitation linewidth in semicrystalline polymeric semiconductors

Abstract

We measure the homogeneous excitation linewidth of regioregular poly(3-hexylthiophene), a model semicrystalline polymeric semiconductor, by means of two-dimensional coherent photoluminescence excitation spectroscopy. At a temperature of 8\,K, we find a linewidth that is always $\gtrsim 110$\,meV full-width-at-half-maximum, which is a significant fraction of the total linewidth. It displays a spectral dependence and is minimum near the 0--0 origin peak. We interpret this spectral dependence of the homogeneous excitation linewidth within the context of a weakly coupled aggregate model.

arXiv comment13 pages, 4 figures, Supplementary Material

References in corpus (4)

• The role of intermolecular coupling in the photophysics of disordered organic semiconductors: Aggregate emission in regioregular polythiophene
• Determining exciton bandwidth and film microstructure in polythiophene films using linear absorption spectroscopy
• Watching the coherent birth of polaron pairs in conjugated polymers
• Two-dimensional spatial coherence of excitons in semicrystalline polymeric semiconductors: The effect of molecular weight

Cited by in corpus (5)

• Incoherent population mixing contributions to phase-modulation two-dimensional coherent excitation spectra
• Frenkel biexcitons in hybrid HJ photophysical aggregates
• Identifying incoherent mixing effects in the coherent two-dimensional photocurrent excitation spectra of semiconductors
• Resolving nonlinear recombination dynamics in semiconductors via ultrafast excitation correlation spectroscopy: Photoluminescence versus photocurrent detection
• Exciton-photocarrier interference in mixed lead-halide-perovskite nanocrystals