SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.14: Poster
Mittwoch, 29. März 2023, 17:00–19:00, P3
Nanoscopic Investigation of the Monolayer MoSe2-WSe2 Lateral Heterostructures under Illumination — •Alexander Turchanin1, Tobias Nörenberg1, Ziyang Gan2, Antony George2, Andrey Turchanin2, Susanne C. Kehr1,3, and Lukas M. Eng1,3 — 1TU Dresden — 2Friedrich Schiller University Jena — 3Wuerzburg-Dresden Cluster of Excellence - EXC 2147 (ct.qmat)
Transition metal dichalcogenides (TMDCs) such as MoSe2 and WSe2, are inorganic semiconductor monolayers with great potential for integration into nanoscale devices. Monolayers of different TMDCs can be engineered into lateral or vertical heterostructures forming, e.g., 1D or 2D p-n junctions that strongly respond to light [1]. Here, lateral heterostructures of monolayer MoSe2 and WSe2 grown by chemical vapor deposition are studied at the nanometer length scale by Kelvin Probe Force Microscopy (KPFM) under visible to near-infrared light illumination, i.e. photon energies between 1.45 and 1.95 eV. This approach enables for the simultaneous recording of both the sample surface morphology and the local photoinduced surface potential. By employing the side-band KPFM demodulation [2], quantification of the local band-bending of this in-plane heterostructure is possible with superior sensitivity. Different alterations of the local surface potential are observed when choosing the light exposure above and below the individual TMDCs bandgap energies.
[1] P.A. Markeev et al., J. Phys. Chem. C 125, 13551 (2021).
[2] T. Wagner et al., Beilstein J. Nanotechnol. 6, 2193 (2015).