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- W2808788102 abstract "We systematically investigated changes of a photoluminescence (PL) spectral shape by picking a tungsten disulfide monolayer (1L-${mathrm{WS}}_{2}$) grown on a sapphire (SA) substrate and dropping it on various substrates such as SA, ${mathrm{SiO}}_{2}$, and hexagonal boron nitride (hBN). An inhomogeneous contribution to the exciton PL linewidth was reduced by picking the CVD-grown 1L-${mathrm{WS}}_{2}$, meaning potential energy disorder lowering in the 1L-${mathrm{WS}}_{2}$. In addition, a defect-bound exciton peak was not seen at low temperature for all the samples with the pick-and-drop process although it was clearly observed for the as-grown sample. It was thought that the as-grown 1L-${mathrm{WS}}_{2}$ was covalently bonded on the SA substrate surface due to the existence of crystal imperfections in the ${mathrm{WS}}_{2}$ and the covalent bonds formed midgap states. A PL spectrum had to be carefully treated in order to fairly evaluate a crystal quality in a CVD-grown 1L-${mathrm{WS}}_{2}$ since PL spectral shapes were determined by complexes of the defect density with other mechanisms such as strain fluctuation and a connection with the substrate." @default.
- W2808788102 created "2018-06-29" @default.
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- W2808788102 date "2018-06-22" @default.
- W2808788102 modified "2023-10-18" @default.
- W2808788102 title "Effect of a pick-and-drop process on optical properties of a CVD-grown monolayer tungsten disulfide" @default.
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- W2808788102 doi "https://doi.org/10.1103/physrevmaterials.2.064003" @default.
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