Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I

O 20.2: Vortrag

Dienstag, 19. März 2024, 11:00–11:15, HE 101

Probing charge redistribution at the interface of self-assembled cyclo-P5 pentamers on Ag(111) — •Remy Pawlak¹, Outhmane Chahib¹, Yulin Yin², Jung-Ching Liu¹, Chao Li¹, Thilo Glatzel¹, Feng Ding², Qinghong Yuan³, and Ernst Meyer¹ — ¹Department of Physics, University of Basel, Basel, Switzerland — ²Chinese Academy of Sciences, Shenzhen, China — ³East China Normal University, Shanghai, China

Phosphorus pentamer (cyclo-P₅⁻) ions are unstable in nature but can be synthesized at the Ag(111) surface. Unlike monolayer black phosphorous, little is known about their electronic properties when in contact with metal electrodes, although this is crucial for future applications. Here we characterize the atomic structure of cyclo-P₅ assembled on Ag(111) using atomic force microscopy with functionalized tips and density functional theory. Combining force and tunneling spectroscopy, we find that a strong charge transfer induces an inward dipole moment at the cyclo-P₅/Ag interface as well as the formation of an interface state. We probe the image potential states by field-effect resonant tunneling 1and quantify the increase of the local change of work function of 0.46 eV at the cyclo-P₅ assembly. Our results suggest that the high-quality of the cyclo-P₅/Ag interface might serve as a prototypical system for electric contacts in phosphorus-based semiconductor devices.

Keywords: atomic force microscopy; scanning tunneling microscopy; field-emission resonance spectroscopy; density functional theory; cyclo-P5− pentamer