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O: Fachverband Oberflächenphysik
O 77: Poster Session - 2D Materials: Stacking and Heterostructures
O 77.7: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Growth and Characterization of van-der-Waals heterostructures prepared from modulated elemental precursors — •Fabian Göhler1, Erik C. Hadland2, Marisa Choffel2, Aalaa Osman1, Constance Schmidt1, Dietrich R.T. Zahn1, Florian Speck1, David C. Johnson2, and Thomas Seyller1 — 1Chemitz University of Technology, 09126 Chemnitz, Germany — 2University of Oregon, Eugene, OR 97403, United States
Modulated elemental reactants (MER) offer a new avenue to synthesize a virtually unlimited number of previously unknown heterostructures. In this two step synthesis, an amorphous precursor is first deposited by sequential physical vapor deposition. By precisely calibrating the thicknesses and layering sequence of the constituents to mimic the targeted structure, it is possible to crystallize the precursor into a layered thin film via annealing in inert atmosphere. Due to the structuring of the precursor on an atomic level, the necessary energy input as well as layer intermixing during crystallization is reduced, enabling the synthesis of metastable structures with arbitrary complexity. [1] Recently, we were able to push the MER synthesis towards the two-dimensional limit by preparing a one monolayer thick, nanocrystalline layer of MoSe2 on a substrate of epitaxial graphene on SiC. [2] Building on these results, we are now exploring the incorporation of different types of bismuth selenide layers into the heterostructure to tune the electronic and structural properties of the MoSe2.
[1] Westover et al., J. Solid State Chem. 236, 173 (2016).
[2] Göhler et al., Phys. Stat. Sol. B 256, 1800283 (2018).