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Low-temperature photoluminescence of oxide-covered single-layer MoS2

Plechinger, Gerd ; Schrettenbrunner, Franz-Xaver ; Eroms, Jonathan ; Weiss, Dieter ; Schueller, Christian ; Korn, Tobias


We present a photoluminescence study of single-layer MoS2 flakes on SiO2 surfaces. We demonstrate that the luminescence peak position of flakes prepared from natural MoS2, which varies by up to 25 meV between individual flakes, can be homogenized by annealing in vacuum. We use HfO2 and Al2O3 layers prepared by atomic layer deposition to cover some of our flakes. In these flakes, we observe a ...


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