Determination of energetic positions of electronic states and the exciton dynamics in a π-expanded N-heterotriangulene derivative adsorbed on Au(111)
Bridged triarylamines, so-called N-heterotriangulenes (N-HTAs) are promising organic semiconductors for applications in optoelectronic devices. Thereby the electronic structure at organic/metal interfaces and within thin films as well as the electronically excited states dynamics after optical excit...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2024
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| In: |
Physical chemistry, chemical physics
Year: 2024, Jahrgang: 26, Heft: 23, Pages: 16454-16458 |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/D4CP01713G |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1039/D4CP01713G Verlag, kostenfrei, Volltext: https://pubs.rsc.org/en/content/articlelanding/2024/cp/d4cp01713g 
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| Verfasserangaben: | Jakob Steidel, Ina Michalsky, Mohsen Ajdari, Milan Kivala and Petra Tegeder |
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| 245 | 1 | 0 | |a Determination of energetic positions of electronic states and the exciton dynamics in a π-expanded N-heterotriangulene derivative adsorbed on Au(111) |c Jakob Steidel, Ina Michalsky, Mohsen Ajdari, Milan Kivala and Petra Tegeder |
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| 520 | |a Bridged triarylamines, so-called N-heterotriangulenes (N-HTAs) are promising organic semiconductors for applications in optoelectronic devices. Thereby the electronic structure at organic/metal interfaces and within thin films as well as the electronically excited states dynamics after optical excitation is essential for the performance of organic-molecule-based devices. Here, we investigated the energy level alignment and the excited state dynamics of a N-HTA derivative adsorbed on Au(111) by means of energy- and time-resolved two-photon photoemission spectroscopy. We quantitatively determined the energetic positions of several occupied and unoccupied molecular (transport levels) and excitonic states (optical gap) in detail. A transport gap of 3.20 eV and an optical gap of 2.58 eV is determined, resulting in an exciton binding energy of 0.62 eV. With the first time-resolved investigation on a N-HTA compound we gained insights into the exciton dynamics and resolved processes on the femtosecond to picosecond timescale. | ||
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