Regensburg 2013 – scientific programme
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DS: Fachverband Dünne Schichten
DS 28: Layer Properties: Electrical, Optical, and Mechanical Properties
DS 28.11: Talk
Thursday, March 14, 2013, 12:15–12:30, H8
Optical Properties and Wetting-like Behavior of Gallium Selenide Nanoflakes on Crystalline Carbon — •Raul D. Rodriguez1, Alexander Villabona1,2, Susanne Müller1, Philipp Tonndorf3, Rudolf Bratschitsch3, Santos A. Lopez-Rivera2, and Dietrich RT Zahn1 — 1Semiconductor Physics, Chemnitz University of Technology, Chemnitz, Germany — 2Universidad de Los Andes, Laboratorio de Física Aplicada, Merida, Venezuela. — 3Dynamics of Nanoscopic and Mesoscopic Structures, Chemnitz University of Technology, Germany
Two-dimensional (2D) materials have become the focus of research in recent years due to the remarkable physical properties observed in structures such as graphene. In this context, other 2D systems like gallium selenide and gallium sulfide have been investigated for a variety of applications from transistors to photodetectors. In this work we report on the study of the optical and the structural properties of high quality GaSe nanoflakes deposited on highly oriented pyrolitic graphite (HOPG). AFM observations show that GaSe layers adopt the morphology of the underlying carbon in a wetting-like behavior. Such strong interaction can be presumably attributed to van der Waals interaction non-screened in this system due to the high hydrophobicity of both substrates. Spatially resolved Raman and photoluminescence spectroscopies reveal a strong anisotropy on the edges and the stripe-like defects of the GaSe nanoflakes. It is found that GaSe regions with highest Raman activity and luminescence are located on crystal borders with a minor contribution from the basal crystal planes.