Strong Photoluminescence Fluctuations in Laser-Thinned Few-Layer WS2 |
| Ł. Balaa, E.M. Łacińska a, K. Nogajewski b, M.R. Molas b, A. Wysmołek a, and M. Potemski b
aFaculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warszawa, Poland bLaboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25, av. des Martyrs, 38042 Grenoble, France |
| Full Text PDF |
| We present results of μ-Raman and μ-photoluminescence study of few-layer WS2 flakes that have been locally thinned down by a focused laser beam. The Raman spectroscopy measurements prove that the investigated flake was locally thinned down to a monolayer. Interestingly, μ-photoluminescence experiments allowed us to observe huge intensity fluctuations at the boundary of laser-thinned region. Similar effects were found at the edges of a WS2 bilayer flake, which has not been subjected to laser-thinning. The origin of the observed time evolution of the photoluminescence response is discussed in terms of potential fluctuations resulting from light-induced changes of the charge state of defects. |
DOI: 10.12693/APhysPolA.130.1176 PACS numbers: 73.22.-f, 71.35.-y, 78.55.-m, 78.30.-j |