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HL: Fachverband Halbleiterphysik

HL 36: 2D Materials VI – Optoelectronic properties

HL 36.1: Vortrag

Mittwoch, 11. März 2026, 17:30–17:45, POT/0081

Surface acoustic wave-controlled photocurrent in few-layer WSe2 — •Benjamin Mayer, Felix Ehring, Matthias Weiß, Hubert Krenner, Ursula Wurstbauer, and Emeline Nysten — Institute of Physics, University of Münster, Germany

Surface acoustic waves (SAWs) offer a versatile platform for nanoscience applications [1]. Their ability to integrate GHz-frequency control and sensing schemes at micron-scale wavelengths on a chip opens cross-disciplinary applications and enables the SAW electric field to drive acousto-electric currents in low-dimensional materials, including semiconducting transition metal dichalcogenides (TMDCs) [2]. Here, we study the AEC and the underlying charge-carrier dynamics in mechanically exfoliated 2D tungsten diselenide (WSe2) placed on two gold electrodes integrated into hybrid lithium-niobate-based SAW devices (150-250 MHz). Our multifunctional acousto-optoelectric setup combines current-voltage characterization, SAW-direction dependent AEC measurements and spectrally resolved scanning photocurrent (PC) spectroscopy. This allows detailed investigation of how electrical contacts affect the performance of our archetypical acoustophoto-electric device. Thus, we establish a qualitative model of the tunneling barrier and band bending induced by Schottky barriers at the Au-TMDC interface [3]. Further, tuning the optical excitation wavelength provides spectral access to energy-dependent photocurrent contributions and reveals how they are modulated by the SAW.

[1] Krenner, J. Phys. D: Appl. Phys. (2025, subm.) [2] Nat. Comm. 6 (1): 8593 (2015) [3] ACS Appl. Electr. Mat. 7 (21): 9717 (2025)

Keywords: surface acoustic waves; acousto-electric current