Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Focus Session: Two-Dimensional Materials II (joint session DS, HL, TT, organized by HL)
TT 9.11: Vortrag
Montag, 20. März 2017, 18:15–18:30, POT 81
The Influence of the Substrate Material on the Optical Properties of Tungsten-Diselendide Monolayers — Sina Lippert1, •Lorenz Schneider1, Dylan Renaud1, Kyung Nam Kang2, Obafunso Ajayi3, Marc Halbich1, Oday Abdulmunem1, Xing Lin1, Jan Kuhnert1, Khaleel Hassoon1, Saideh Edalati-Boostan1, Young Duck Kim3, Wolfram Heimbrodt1, Eui-Hyeok Yang2, James Hone3, and Arash Rahimi-Iman1 — 1Faculty of Physics, Philipps-Universität, Marburg 35032, Germany — 2Department of Mechanical Engineering, Stevens Institue of Technology, Hoboken, New Jersey, 07030, USA — 3Department of Mechanical Engineering, Columbia University, New York, New York, 10027, USA
In recent years 2D materials based on transition metal dichalogenides (TMDs) have come up as an interesting material system mainly due to their remarkable properties in the monolayer regime after the successful exploration of graphene. While the main optical properties of these materials have been studied and understood well, the influence of the substrate material on the energy levels and the recombination dynamics are not yet sufficiently discussed. Here, we present a systematic comparison of the optical properties of monolayered WSe2 on different substrates including SiO2, sapphire, Si3N4-hBN and MgF2. In addition to the exfoliated monolayers, a CVD grown monolayer on sapphire is included. While similarities have been found for the Raman signal and PL of these samples, small differences regarding excitonic features, emission characteristics and decay dynamics have been observed in dependence on the substrate.