Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Organic molecules on inorganic substrates: electronic, optical and other properties – Poster
O 46.9: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Photoemission intermittency from organic quasi-one-dimensional crystals coupled with silver nanoparticles — •Moha Naeimi1,2, Waqas Pervez1,2, Frithjof Harmsen1,2, Ingo Barke1,2, and Sylvia Speller1,2 — 1Institute of physics, University of Rostock — 2Department of life, light & matter, University of Rostock
Organic, quasi-one-dimensional crystals are suitable platforms for triplet exciton migration, latter only requiring minimal orbital coupling [1]. In organic molecules, triplet excitons can be generated via singlet fission, where excited singlet states convert into two long-lived triplet states [2]. We recently prepared long quasi-one-dimensional rubrene crystals on silicon substrates with a native thin silicon oxide layer (SiO2) [3]. After depositing Ag nanoparticles, we observe strong photoemission intermittency (blinking) at the interface sites and weak blinking on the rod crystal itself. In this work, we characterize the blinking in terms of its time traces and time-of-flight electron spectra. The blinking is consistent with exciton propagation that becomes trapped at nanoparticle-containing interface sites, where apparent electron binding energies shift to lower values. These molecule-nanoparticle systems offer promising pathways for directed energy transport and guided exciton migration.
[1] S. R. Yost et. al., J. Phys Chem C 116, 17369 2012. [2] T. Zhu et. al., J. Phys. Chem. Lett. 9, 6502 - 6510 2018. [3] Naeimi et. al, Adv. Opt. Mater., 2025 (DOI:10.1002/adom.202502744).
Keywords: rubrene; Photoemission; PEEM; Nano particle; Silver