Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.6: Poster

Dienstag, 19. März 2024, 12:30–14:30, Poster A

Modifications of the Au(111) reconstruction induced by the adsorption of P2 and its role for the growth of blue-phosphorus. — •Morris Mühlpointner and Moritz Sokolowski — Clausius Institute for Physical and Theoretical Chemistry of the University of Bonn, Wegelerstr. 12, 53115, Bonn Germany

The adsorption of phosphorus on the Au(111) surface has been studied under the aim to grow a two-dimensional “blue-phosphorus” (bP) structure, which is analogous to graphene. Furthermore, phosphorus adsorption has been shown to alter the structure of the Au(111) reconstruction from the herringbone reconstruction to a “trigon reconstruction” (TR) [1].

In the present work, we investigated the structure of the TR for increasing bP coverages using high-resolution spot-profile analyzing low-energy electron diffraction (SPA-LEED). We observed the TR prior to bP film growth with a highly-ordered structure. At higher P-coverages, patches of the bP structure and the TR coexist. With time, the structure of the TR distorts and forms disordered patches of Au(111) surface that exhibit low P-coverages. Further insight was obtained by temperature programmed desorption (TPD) spectra, which show a zero-order desorption peak, regardless of the starting coverage. We propose that this zero-order desorption peak can be explained by a phase-equilibrium.

[1] ACS Nano 14, 3687-3695, 2020 .

This work was supported by the DFG through the research training group 2591.