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27 February 2019 Efficient defect healing of transition metal dichalcogenides by phthalocyanines
H. Ahn, G.-H. Lee
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Proceedings Volume 10920, 2D Photonic Materials and Devices II; 109200R (2019) https://doi.org/10.1117/12.2506867
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
We present that a thin layer of phthalocyanine (Pc) molecules can efficiently improve the optical quality of defective MoSe2 grown by CVD method. Since MoSe2 flakes are coupled with Pc molecules through van der Waals force, the structural change can be minimized, but the pristine properties can be significantly recovered. This defect healing effect can be achieved via ultrathin coverage of Pc molecules using a simple solution-mediated process. We also observed that Pc molecules with nanometer-scale lateral dimensions is useful in suppression of point defects commonly observed in mechanically exfoliated 2D TMDCs when it is improperly annealed at sub-decomposition temperatures.
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H. Ahn and G.-H. Lee "Efficient defect healing of transition metal dichalcogenides by phthalocyanines", Proc. SPIE 10920, 2D Photonic Materials and Devices II, 109200R (27 February 2019); https://doi.org/10.1117/12.2506867
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KEYWORDS
Molybdenum
Molecules
Doping
Chemical vapor deposition
Excitons
Transition metals
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