Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Organic Molecules on Inorganic Substrates II: Electronic, Optical and other Properties

O 15.11: Talk

Monday, March 18, 2024, 17:30–17:45, MA 043

Electronic properties of N-heterocyclic carbenes and olefins on Si(111)√3×√3 R30^∘-B — •Eva Glomski¹, Milan Kubicki¹, Mowpriya Das², Ankita Das², Robert Zielinski¹, René Schöder¹, Susi Lindner Franz¹, Mike Thomas Nehring¹, Mario Dähne¹, Frank Glorius², and Martin Franz¹ — ¹Technische Universität Berlin, Institut für Festkörperphysik, Berlin, Germany — ²Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Münster, Germany

Silicon is the most widely used semiconductor material in electronic devices and a modification or functionalization by organic overlayers is a promising approach to enhance their functionality. Recently, N-heterocyclic carbenes (NHCs) and olefins (NHOs) were found to be promising candidates for a modification of silicon surfaces [1,2]. In this work, the adsorption of NHCs and NHOs on the Si(111)(√3×√3)R30^∘-B surface is investigated using synchrotron based high-resolution photoelectron spectroscopy allowing an in-depth study of the binding behavior and the electronic properties of the formed interfaces. Furthermore, the evolution of the band bending is investigated on the basis of Si 2p spectra revealing a different behavior for the studied NHCs and NHOs.

[1] M. Franz et al., Nat. Chem. 13, 828-835 (2021).

[2] M. Das et al., Angew. Chem. Int. Ed. 2023, e202314663.

Keywords: Silicon; N-heterocyclic carbenes; N-heterocyclic olefins; Photoelectron spectroscopy