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SM ISO690:2012 MISHINA, E., SHERSTYUK, N., LAVROV, Sergey, SIGOV, Aleksander, MITIOGLU, Anatolie, ANGHEL, Sergiu, KULYUK, Leonid. Observation of two polytypes of MoS2 ultrathin layers studied by second harmonic generation microscopy and photoluminescence. In: Applied Physics Letters, 2015, vol. 106, p. 0. ISSN 0003-6951. DOI: https://doi.org/10.1063/1.4907972 |
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Applied Physics Letters | |
Volumul 106 / 2015 / ISSN 0003-6951 | |
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DOI:https://doi.org/10.1063/1.4907972 | |
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Rezumat | |
Second harmonic generation (SHG) of a high intensity was found in MoS2 flakes of different thicknesses exfoliated on a silicon substrate. Reduction of the SHG intensity was observed only for a small portion of flakes, for both very thin and quite thick ones. This was attributed to the presence of polytypism, i.e., of 3R non-centrosymmetric and 2H centrosymmetric polytypes, in a source bulk crystal grown by the chemical vapor transport technique. The presence of two polytypes in the sample was confirmed by the spectral structure of the photoluminescence of bound excitons observed in flakes at low temperature. Absolute values of nonlinear susceptibility of MoS2 flakes of different thicknesses were estimated. |
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Cuvinte-cheie Molybdenum compounds, Nonlinear optics, photoluminescence, polymorphism, temperature, Transport properties |
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