Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.7: Poster

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

Electronic Fingerprints of Platinum Surface Tellurides and PtxTey Films on Pt(111) — •Isabella Stollberg, Andreas Raabgrund, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

For the synthesis of transition metal dichalcogenides, in general two approaches can be utilized: evaporating the metal and the chalcogenide on a suitable substrate [1] or directly depositing only the chalcogenide on a desired metal substrate. We investigated by STM, STS, and DFT the properties of PtxTey films on Pt(111) that are synthesized according to the latter approach. Depending on Te content, a (3 × 3) and (10× 10) surface telluride structure are found, followed by the growth of Pt2Te2 and PtTe2 [2].

Applying STS measurements we found characteristic features on the respective structures which can be used as fingerprints for identification. By comparison with DFT calculations we attribute the STS features to electronic states within the telluride films. Additionally, we determined the work function differences probing field emission resonances. We find that the (10× 10) surface telluride has the lowest but Pt2Te2 and PtTe2 have very similar work functions.
[1] K. Lasek et al., Nano Lett. 22, 23 (2022)
[2] T. Kißlinger et al., Phys. Rev. B 108, 205412 (2023)