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O: Fachverband Oberflächenphysik
O 77: Poster Session - 2D Materials: Stacking and Heterostructures
O 77.2: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Substrate dependent energy level alignment at a hybrid transition metal dichalcogenide monolayer/molecular semiconductor interface — •Jie Ma1,2, Patrick Amesalem1, Xiaomin Xu3, Thorssten Schultz1,2, Dongguen Shin1,2, and Norbert Koch1,2 — 1Institut für Physik & IRIS Adlershof, Humboldt Universität zu Berlin, Germany — 2Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Germany — 3Tsinghua-Berkeley Shenzhen Institute (TBSI), China
Combining transition metal dichalcogenides (TMDCs) and molecular semiconductors (MSCs) is an attractive route for forming van der Waals heterostructures[1] with novel (opto-)electronic properties. Such properties are expected to strongly depend on the energy level alignment at the corresponding interfaces, which may also be influenced by the employed supporting substrate[2]. In particular, a detailed microscopic understanding of the impact of the substrate electrical properties on the energy level alignment at TMDC/MSC interfaces is still lacking. Here, we determined by angle-resolved ultraviolet and X-ray photoelectron spectroscopy the electronic band line-up at a WS2/C60 interface supported by either an insulating or a semi-metallic substrate. These insights can be useful for future design of functional heterostructures with tailored (opto-)electronic properties based on the combination of 2D and molecular semiconductor materials.
[1] D. Jariwala. et al. Nano Lett. 16, 497-503 (2016).
[2] P. Soohyung. et al. Commun Phys. 2 (2019) 109.