Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 113: 2D materials beyond graphene: TMDCs, silicene and relatives V
O 113.7: Vortrag
Freitag, 16. März 2018, 12:00–12:15, MA 043
Insights into ferecrystalline layered heterostructures using surface science techniques — •Fabian Göhler1, Niels Rösch1, Erik Hadland2, Danielle Hamann2, Florian Speck1, David C. Johnson2, and Thomas Seyller1 — 1Professur für Technische Physik, TU Chemnitz, Reichenhainer Str. 70, D-09126 Chemnitz, Germany — 2Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, United States
The stacking of single sheets of 2D materials to design hybrids with new emergent properties is a rapidly emerging field in materials science. An interesting avenue to synthesize a large number of different layered heterostructures on a wafer scale is provided by the Modulated Elemental Reactants (MER) technique, which allows independent control over constituents and layering sequence. [MX1+δ]m[TX2]n ferecrystal heterostructures are nanocrystalline, turbostratically disordered, layered materials that are synthesized by MER from structurally modulated, amorphous precursors at relatively low temperatures.
The talk will give an overview over recent results obtained from surface science techniques, mainly X-ray photoelectron spectroscopy (XPS) and LEED, on a number of ferecrystal compounds. These techniques provide insight into electronic interactions and structural modulations within and in between distinct layers. Among the results shown are interlayer charge transfer in [PbSe1+δ]1[NbSe2]2 and [SnSe1+δ]m[TiSe2]2, antiphase boundaries in rocksalt-like BiSe bilayers separated by NbSe2 or MoSe2, and structural polytypism in single layers of MoSe2 separated by BiSe.