Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 63: 2D Materials beyond Graphene

O 63.1: Poster

Wednesday, March 18, 2015, 18:15–21:00, Poster A

XPS study of mecanical exfoliated molybdenum disulphide — •Philipp Espeter, Dominique Handschak, Christoph Keutner, Peter Roese, Ulf Berges, and Carsten Westphal — Experimentelle Physik I/DELTA, TU Dortmund, Otto-Hahn-Straße 4, 44221 Dortmund, Germany

The transition metal dichalcogenide molybdenum disulphide (MoS₂) belongs to the layered materials with a strong in-plane and weak out-of-plane bonding. Thinning bulk MoS₂ down to monolayer thickness influences its electronic proporties. MoS₂ monolayer with direct bandgap of about 1,9 eV is a promising candidate for applications in electronic and opto-electronic devices. We report on the results of XPS investigations of mechanical exfoliated molybdenum disulphide conducted at the PGM undulator beamline 11 of Dortmund’s synchrotron source DELTA. Vacancy formation due to the exfoliation process is monitored as well as the occupation of sulfur lattice sites and vacancies by oxygen.