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Download fileElectronic Changes in Molybdenum Dichalcogenides on Gold Surfaces
journal contribution
posted on 2020-11-09, 21:04 authored by Glenn G. Jernigan, Jose J. Fonseca, Cory D. Cress, Mikhail Chubarov, Tanushree H. Choudhury, Jeremy T. RobinsonX-ray
and ultraviolet photoelectron spectroscopy are performed
on transition metal dichalcogenides (TMDs) MoS2, MoSe2, and MoTe2 monolayers on Au surfaces, to identify
charge transfer processes and changes in structural phase upon annealing
up to 500 °C. Although charge transfer does appear to occur as
the spacing between the TMD monolayer and the Au surface decreases,
we do not find spectroscopic evidence for the 2H to 1T phase change
in exfoliated TMDs. However, we find the defect density of the TMDs
influences the evolution of the X-ray photoelectron spectra during
thermal treatment on Au. Both metal–organic chemical vapor
deposition grown and helium-ion irradiated exfoliated-TMDs annealed
on Au surfaces show shifts in their spectra that could be interpreted
as a phase change, but are the result of TMD/Au hybridization, grain
boundaries and defects interacting with the Au surface.
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X-ray photoelectron spectraspectroscopic evidencecharge transferMoTe 2 monolayerssurface decreases1 T phase changephotoelectron spectroscopyphase changeexfoliated TMDstransition metal dichalcogenidesMoSe 2MoS 2Molybdenum Dichalcogenidescharge transfer processesgrain boundariesdefect densityElectronic Changesexfoliated-TMDs annealedsurfaces show shifts2 HGold Surfaces X-rayTMD monolayerTMDs influences