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HL: Fachverband Halbleiterphysik
HL 14: Poster: Two-Dimenaional Materials and Topological Insulators
HL 14.6: Poster
Monday, March 20, 2017, 14:00–18:00, P2-OG3
The effects of substrate and chemical treatment on the optical properties of 2D MoS2 — •Oleg Gridenco, Genrietta Steingelb, Kathrin Sebald, and Jürgen Gutowski — Semiconductor Optics, Institute of Solid State Physics, University of Bremen, Germany
Two-dimensional transition metal dichalcogenide semiconductors are intriguing materials for the realization of quantum light sources due to their opto-electronic properties. We present a systematic study of the optical properties of ultra-thin molybdenum disulfide (MoS2) layers deposited on different substrates (SiO2, Si3N4, GaN and polymeric dielectric gel-films). It is observed that the optical properties are affected by the interaction with different substrates. These changes can be related to a substrate-induced variation of the doping level, altering the relative intensity of charged and neutral excitons. Along with this, we present the results of a comparative analysis of the influence of different chemical treatments on the optical properties. These results raise the prospect to tune the optical properties of 2D MoS2 crystal by choosing suitable substrates and chemical treatment.