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HL: Fachverband Halbleiterphysik

HL 74: Poster IIIA

HL 74.10: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/2OG

Looking for interlayer excitons in hybrid WSe₂/MoS₂ heterostructures — •Rico Schwartz¹, Alina Christine Schubert¹, Antony George², Andrey Turchanin², and Tobias Korn¹ — ¹Institut für Physik, Universität Rostock, D-18059 Rostock, Germany — ²Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany

Fabrication and optical spectroscopy of transition metal dichalcogenide (TMDC) monolayers and their heterostructures have been intensely studied by a lot of work groups in recent years. One interesting aspect is the excitation of interlayer excitons, that means excitons whose electrons and holes are placed in different monolayers and thus in different materials.

TMDC heterostructures are mostly fabricated by deterministic stacking of exfoliated flakes, which limits their size to a few tens of microns. CVD growth, in contrast, allows large-scale TMDC films which might be interesting for future industrial applications.

We study a hybrid heterostructure consisting of a CVD-grown WSe₂ monolayer on a Si/SiO₂ substrate [1] combined with an exfoliated MoS₂ flake. In photoluminescence studies, we observe a pronounced quenching of intralayer exciton emission in our heterostructure, indicating interlayer charge transfer. Additionally, we find emission from interlayer excitons comparable to those in samples fabricated using only exfoliated layers [2].

[1] A. George et al., J. Phys.: Mater. 2, 016001 (2019)

[2] J. Kunstmann et al., Nature Physics 14, 801-805 (2018)