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O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.15: Poster

Tuesday, March 19, 2024, 12:30–14:30, Poster A

Local Work Function Modulation of Hexagonal Boron Nitride on Pt(110) — •Marco Thaler, Matthias Zeilerbauer, and Laerte Patera — University of Innsbruck, Austria

Hexagonal boron nitride (h-BN) offers a wide band gap, high thermal stability and low chemical reactivity and therefore has emerged as a promising candidate to serve as an ultra thin layer for the deposition and decoupling of organic molecules on surfaces. Remarkably, on the incommensurate Pt(110) surface, h-BN can be grown as a large-area single-domain monolayer of excellent quality. The lattice mismatch between the hexagonal adlayer and the platinum substrate leads to the formation of a distinctive moiré pattern. Using field emission resonance spectroscopy (FERS), a spatial modulation of the local work function can be observed depending on which moiré region is examined. Upon room temperature deposition of 5,10,15,20-Tetrakis(4-aminophenyl)porphyrin (Co-TAPP), the porphyrins arrange into clusters occupying a variety of adsorption sites of the h-BN/Pt(110) unit cell. With the help of scanning tunneling spectroscopy a site-specific shift of the Co-TAPP states is observed, which can be associated to the local work function differences of the underlying substrate. This shows that Co-TAPP can act as an effective probe to study the work function landscape of our system.

Keywords: boron nitride; Co-TAPP; STS; work function; FERS