SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 75: Poster Session VI: Organic molecules on inorganic substrates: electronic, optical and other properties II

O 75.5: Poster

Mittwoch, 3. März 2021, 13:30–15:30, P

Adsorption site dependent gating of C60 on h-BN/Rh(111) — •Max Bommert and Oliver Gröning — Empa Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland

Epitaxial, single layered hexagonal Boron Nitride (h-BN) on a metal substrate provides numerous interesting properties as it can be used as a template organizing the adsorption of organic molecules due to the substrate dependent Moirée pattern formation [1] as well as decoupling said molecules from the underlying metal preventing orbital hybridization [2]. In this project we use the topographic and electronic corrugation of the h-BN/Rh(111) Moirée pattern to form [3] and electrostatically gate specific C60 molecules in regular frameworks. Our experimental approach consists of two parts; in a first step, we use low-temperature scanning tunneling microscopy (STM) to analyze the C60 adsorption configuration. In a second step, we use scanning tunneling spectroscopy (STS), Kelvin probe force microscopy (KPFM) as well as non-contact atomic force microscopy (nc-AFM) to investigate the adsorption-site dependent gating effect of the on surface electric field on the C60 molecules. The combination of STS and KPFM grants insight into single molecular charging events. We can use the on surface electric field and the electric field of the STM tip to operate the C60 molecules as single molecular transistors. We will show how the molecular orbital level alignment and the site-dependent gating are related. [1]M. Iannuzzi et al., PCCP, 16 (2014), [2]L. Liu et al., ACS Nano, 9 (2015), [3]M. Corso et al., Science, 203 (2004)