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MMorant.pdf (4.71 MB)
WS2/MoS2 Heterostructures via Thermal Treatment of MoS2 Layers Electrostatically Functionalized with W3S4 Molecular Clusters
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 23.01.2020 and posted on 27.01.2020by Marc Morant-Giner, Isaac Brotons-Alcazar, Nikita Y. Shmelev, Artem L. Gushchin, Luke Norman, Andrei N. Khlobystov, Antonio Alberola, Sergio tatay, J. Canet-Ferrer, Alicia Forment-Aliaga, Eugenio Coronado
The preparation of 2D stacked layers that combine flakes of different nature, gives rise
to countless number of heterostructures where new band alignments, defined at the interfaces,
control the electronic properties of the system. Among the large family of 2D/2D heterostructures,
the one formed by the combination of the most common semiconducting transition metal
dichalcogenides WS2/MoS2, has awaken great interest due to its photovoltaic and
photoelectrochemical properties. Solution as well as dry physical methods have been developed
to optimize the synthesis of these heterostructures. Here a suspension of negatively charged MoS2
flakes is mixed with a methanolic solution of a cationic W3S4-core cluster, giving rise to a
homogeneous distribution of the clusters over the layers. In a second step, a calcination under N2
of this molecular/2D heterostructure leads to the formation of clean WS2/MoS2 heterostructures
where the photoluminescence of both counterparts is quenched, proving an efficient interlayer
coupling. Thus, this chemical method combines the advantages of a solution approach (simple,
scalable and low-cost) with the good quality interfaces reached by using more complicated
traditional physical methods.