Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 16: Layer Properties: Electrical, Optical, and Mechanical Properties I

DS 16.5: Vortrag

Montag, 20. März 2017, 18:00–18:15, CHE 91

Investigation of Indirect Excitons in Bulk 2H-MoS2 Using Transmission Electron Energy-Loss Spectroscopy — •Carsten Habenicht, Martin Knupfer, Roman Schuster, and Bernd Büchner — Leibniz Institute for Solid State and Materials Research, Dresden, Germany

Two-dimensional transition metal dichalcogenides are promising materials for applications in electronics, optoelectronics and photovoltaics among others. The design of efficient devices requires a detailed knowledge of the charge carrier dynamics in those materials, including the occurrence of excitons. We have investigated the indirect excitonic transistions in bulk 2H-MoS2 using transmission electron energy-loss spectroscopy. The electron energy-loss spectra of 2H-MoS2 in the (100) and (110) directions were measured for various momentum transfers up to values corresponding to the distances between the center of the Brillouin zone and their respective edges in reciprocal space. The results allow the identification of a number of indirect excitons and to a limited extent their energy-momentum dispersion. For example, an excitonic transition from a K point to an adjacent K point of the Brillouin zone were observed.