Probing charge redistribution at the interface of self-assembled cyclo-P5 pentamers on Ag(111)

Outhmane Chahib, Yuling Yin, Jung-Ching Liu, Chao Li, Thilo Glatzel, Feng Ding, Qinghong Yuan, Ernst Meyer () and Rémy Pawlak ()
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Outhmane Chahib: University of Basel
Yuling Yin: Shenzhen Institute of Advanced Technology
Jung-Ching Liu: University of Basel
Chao Li: University of Basel
Thilo Glatzel: University of Basel
Feng Ding: Shenzhen Institute of Advanced Technology
Qinghong Yuan: East China Normal University
Ernst Meyer: University of Basel
Rémy Pawlak: University of Basel

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Phosphorus pentamers (cyclo-P5) 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 and quantify the increase of the local change of work function of 0.46 eV at the cyclo-P5 assembly. Our experimental approach suggest that the cyclo-P5/Ag interface has the characteristic ingredients of a p-type semiconductor-metal Schottky junction with potential applications in field-effect transistors, diodes, or solar cells.

Date: 2024
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DOI: 10.1038/s41467-024-50862-4

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