Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: 2D Materials beyond Graphene: TMDCs, Slicene and Relatives
O 46.3: Poster
Tuesday, March 8, 2016, 18:15–20:30, Poster E
Raman- and Photoluminescence Spectroscopy on few- and monolayered WSe2 — •Walter Enns1, Sergej Neb1, Sebastian Fiechter2, and Walter Pfeiffer1 — 1Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany — 2Helmholtz Zentrum Berlin, Institut für Solare Brennstoffe, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
The transition-metal dichalcogenide WSe2 was exfoliated onto thermal oxidized silicon with 70 nm oxide thickness. Few- and monolayered flakes were investigated with confocal micro-Raman spectroscopy and photoluminescence spectroscopy applying two different wavelengths, 473 nm and 633 nm. The former measures the layer-dependent frequency difference of the out-of-plane to the in-plane vibration, while the latter is sensitive to the typical transition from indirect to direct band gap when changing from few-layer to monolayer WSe2. Thus, both methods have the capability to distinguish between varying numbers of layers.