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 46.4: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Electronic structure of spiro-bridged N-heterotriangulenes on Au(111) — •Jakob Roth1, Jakob Sawatzki1, Christian Huck1, Angelina Jocic2, Milan Kivala2, and Petra Tegeder1 — 1Institute for Physical Chemistry — 2Institute of Organic Chemistry, Heidelberg University
N-heterotriangulenes are versatile p-type organic semiconductors combining enhanced planarity with sterically defined bridges, enabling highly stable amine-centered radical cations, making them promising candidates for semiconducting and energy storage applications.
Here, we investigated the adsorption and electronic structure of two model systems - dimethylmethylene-bridged N-heterotriangulene (TN) and spirofluorene-bridged N-heterotriangulene (FTN) - deposited on Au(111). The spiro-annulated fluorenyl groups of FTN are expected to elevate the molecular core and hence reduce the electronic coupling strength to the metal substrate. Scanning tunnelling microscopy reveals that both species form well-ordered monolayers. Two-photon photoemission spectroscopy quantitatively resolves occupied and unoccupied electronic (transport levels) as well as excitonic states (optical gaps). These results highlight how molecular design controls surface coupling and electronic level alignment in Triphenylamine-based materials.
Keywords: Two-photon photoemission spectroscopy; STM; Au(111); N-heterotriangulenes