Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Poster: Two-Dimenaional Materials and Topological Insulators

HL 14.6: Poster

Montag, 20. März 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.