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| Hauptseite > Publikationsdatenbank > Anisotropic dispersion of excitonic bands of the single-crystal pentacene (001) surface as measured by low-energy angle-resolved high-resolution electron energy-loss spectroscopy |
| Hauptseite > Publikationsdatenbank > Anisotropic dispersion of excitonic bands of the single-crystal pentacene (001) surface as measured by low-energy angle-resolved high-resolution electron energy-loss spectroscopy |
| Journal Article | FZJ-2025-01649 |
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2025
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.elspec.2025.147514 doi:10.34734/FZJ-2025-01649
Abstract: Low-energy high-resolution electron energy-loss spectroscopy (HREELS) is a useful technique for the charac-terization of various excitation processes at solid surfaces. However, no successful work has been reported onmolecular single-crystal samples yet. In the present study, low-energy angle-resolved HREELS measurementswere conducted on single-crystal pentacene, an organic semiconductor. The results confirmed the excitonicbands exhibiting energy–momentum dispersion and anisotropy of these depending on the surface crystallo-graphic directions, corroborating the occurrence of exciton delocalization, contrary to the ordinary notion of theFrenkel exciton for weakly interacting van der Waals molecular solids. The present results demonstrate that low-energy angle-resolved HREELS is applicable to the precise examination of the excitonic characteristics of solid-state surfaces, even for molecular semiconductor single crystals.
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