Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: 2D Materials Beyond Graphene III

O 70.2: Vortrag

Mittwoch, 22. März 2017, 10:45–11:00, WIL A317

Fabrication and characterization of coupled TMDC heterostructures — •Borja V. Pano1,2, Bastian Miller1,2, Alexander W. Holleitner1,2, and Ursula Wurstbauer1,21Walter Schottky Institute and Physics-Department, Technical University Munich, Am Coulombwall 4a, 85748 Garching — 2Nanosystems Initiative Munich (NIM), Schellingstr. 4, 80799 Munich, Germany

Atomically thin transition metal dichalcogenides (TMDC) have emerged as an exciting class of two-dimensional (2D) semiconductors with unique electronic and optoelectronic properties, and are of interest for both fundamental research and novel device applications.

We investigate heterostructures of four different TMDC monolayers (MoS2, WS2, MoSe2, WSe2). Due to the formation of a type II band alignment between the layers and the strong Coulomb binding energy in 2D TMDC, these devices open a promising path for studying long-lived interlayer excitons, where bound electrons and holes are localized in different layers.

A polymer-based dry transfer technique is used to vertically stack micromechanical cleaved monolayers with angle alignment of the crystal axes. We characterize the heterostructures through optical and atomic force microscopy, Raman and photoluminescence spectroscopy. We observe strong signatures of interlayer coupling.

We acknowledge the financial support by the DFG and the excellence cluster Nanosystems Initiative Munich (NIM).

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