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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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Bibliographic Details
Main Authors: Steidel, Jakob (Author) , Michalsky, Ina (Author) , Ajdari, Mohsen (Author) , Kivala, Milan (Author) , Tegeder, Petra (Author)
Format: Article (Journal)
Language:English
Published: 2024
In: Physical chemistry, chemical physics
Year: 2024, Volume: 26, Issue: 23, Pages: 16454-16458
ISSN:1463-9084
DOI:10.1039/D4CP01713G
Online Access: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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Author Notes:Jakob Steidel, Ina Michalsky, Mohsen Ajdari, Milan Kivala and Petra Tegeder
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Summary: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.
Item Description:Online veröffentlicht: 24. Mai 2024
Gesehen am 28.11.2024
Physical Description:Online Resource
ISSN:1463-9084
DOI:10.1039/D4CP01713G

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