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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.18: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

The impact of the substrate material on the optical properties of 2D WSe₂ monolayers — •Jan Kuhnert¹, Lorenz Maximilian Schneider¹, Sina Lippert¹, Simon Schmitt¹, Obafunso Ajayi², Dylan Renaud¹, Young Duck Kim^2,3, Wolfram Heimbrodt¹, James C. Hone², and Arash Rahimi-Iman¹ — ¹Department of Physics and Material Sciences Center, Philipps-Universit'at Marburg, 35032 Marburg , Germany — ²Department of Mechanical Engineering, Columbia University, 10027 New York, USA — ³Department of Physics and Center for Humanities and Sciences, Kyung Hee University, 02447 Seoul, Republic of Korea

Layered transition-metal dichalcogenides have attracted great interest in the last few years due to their outstanding optical properties caused by the direct band gap located at the K-point in the brillouin zone. Due to the monolayer thickness, the direct environment plays a crucial role concerning the excitonic and therefor the optical properties of these materials. Our study focuses on optical measurements performed on WSe₂ monolayers on three different substrates. Raman, time-integrated photoluminescence (TIPL) and time-resolved photoluminescence (TRPL) reveal influences of an additionally introduced intermediate hexagonal boron nitride (hBN) layer between substrate and the monolayer on the power-dependent time-evolution of the photoluminescence signal.