Regensburg 2025 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 13: Poster

DS 13.21: Poster

Donnerstag, 20. März 2025, 18:00–20:00, P1

Structural and electronical investigation of the Electrode/MoS2 interface by electron microscopy and photoemission — •Eric Juriatti, Christoph Späth, Heiko Peisert, and Marcus Scheele — Universität Tübingen, Institut für Physikalische und Theoretische Chemie, Tübingen, Germany

In search for new semiconducting devices the group of transition-metal dichalcogenides (TMDCs) like molybdenum disulfide (MoS2) is of increasing scientific interest. The exceptionally unique electronic properties, including the tunability of the band gap by exfoliation, of these layered semiconductors allow further miniaturization of devices like photodetectors, which are promising candidates to fulfill Moore*s law in future applications.

The successful manufacturing of astonishingly fast and responsive TMDC photodetectors contacted by gold electrodes was recently demonstrated. However, the influence of the electrodes on the TMDC/metal interface properties, which would supposedly also affect charge carrier transport in devices, has not been studied in detail so far.

In this study, different metals which are typical electrode materials were deposited as thin films on clean MoS2 bulk crystals to mimic the resulting TMDC/Metal interface. The resulting heterostructure was investigated by X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS). In addition, scanning electron microscopy (SEM) was performed to study the growth of the metals on the TMDC surface.

Keywords: Interfaces; Photoelectron spectroscopy; Semiconductors; Thin films; Transition-metal dichalcogenides