Ultrafast photocurrents in monolayer MoS$_2$

ORAL

Abstract

Two-dimensional transition metal dichalcogenides such as MoS$_2$ have emerged as interesting materials for optoelectronic devices. In particular, the ultrafast dynamics and lifetimes of photoexcited charge carriers have attracted great interest during the last years. We investigate the photocurrent response of monolayer MoS$_2$ on a picosecond time scale utilizing a recently developed pump-probe spectroscopy technique based on coplanar striplines. We discuss the ultrafast dynamics within MoS$_2$ including photo-thermoelectric currents and the impact of built-in fields due to Schottky barriers as well as the Fermi level pinning at the contact region.

*We acknowledge support by the ERC via Project 'NanoREAL', the DFG via excellence cluster 'Nanosystems Initiative Munich' (NIM), and through the TUM International Graduate School of Science and Engineering (IGSSE) and BaCaTeC.

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Authors

  • Eric Parzinger

    • Walter Schottky Institute and Physics-Department, Technical University of Munich, Germany

  • Ursula Wurstbauer

    • Walter Schottky Institute and Physics-Department, Technical University of Munich, Germany

  • Alexander Holleitner

    • WSI and Physics Department, TUM, 85748 Garching, Germany
    • Walter Schottky Institute and Physics-Department, Technical University of Munich, Germany
    • Technical University of Munich, Germany