Quantitative electronic structure determination of N-heterotriangulene derivatives adsorbed on Au(111)
N-heterotriangulenes (N-HTAs) are promising organic semiconductors for applications in field effect transistors and solar cells. Thereby the electronic structure of organic/metal interfaces and thin films is essential for the performance of organic-molecule-based devices. Here, we studied the electr...
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| Autori principali: | , , , |
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
10 February 2026
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| In: |
Physical chemistry, chemical physics
Year: 2026, Volume: 28, Fascicolo: 10, Pages: 6208-6213 |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/D5CP04526F |
| Accesso online: | Verlag, kostenfrei, Volltext: https://doi.org/10.1039/D5CP04526F Verlag, kostenfrei, Volltext: https://pubs.rsc.org/en/content/articlelanding/2026/cp/d5cp04526f 
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| Note sull'autore: | Jakob Steidel, Ina Michalsky, Milan Kivala and Petra Tegeder |
| Riassunto: | N-heterotriangulenes (N-HTAs) are promising organic semiconductors for applications in field effect transistors and solar cells. Thereby the electronic structure of organic/metal interfaces and thin films is essential for the performance of organic-molecule-based devices. Here, we studied the electronic properties of two different N-HTAs, the N-HTA-550 and N-HTA-557, the latter containing an additional 7-membered ring, adsorbed on Au(111) using 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. The additional -CC- bridge forming the 7-membered ring in N-HTA-557 resulted in a pronounced increase of the electron affinity by 0.92 eV from 2.19 eV in N-HTA-550/Au(111) to 3.11 eV in N-HTA-557/Au(111) due to the increase of the π-conjugated electron system, while the first ionization potential is nearly unaffected. Structural variation or substitution pattern in N-HTAs foster the opportunity for tailoring their electronic properties. |
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| Descrizione del documento: | Gesehen am 21.05.2026 |
| Descrizione fisica: | Online Resource |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/D5CP04526F |