Mingyang Wei, Jie Lian, Qingfen Jiang, Yu Zhang, Chenlin Wang, Yueming Wang, Zhen Xu. Ellipsometry Study on Optical Properties of Two-Dimensional Platinum Selenide Film[J]. Chinese Journal of Lasers, 2021, 48(12): 1203002

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- Chinese Journal of Lasers
- Vol. 48, Issue 12, 1203002 (2021)

Fig. 1. Schematic of three-zone CVD method

Fig. 2. Surface morphology analysis of PtSe2. (a) Optical photographs of the substrate and 2, 4, and 6 layers of PtSe2; (b) micrograph of 4L PtSe2 with a magnification of 100×; (c) AFM image of 4L PtSe2 with the scratch method showing the sample thickness of 2.2nm

Fig. 3. Raman spectral analysis of PtSe2. (a) Raman spectra of 2, 4, and 6 layers of PtSe2; (b) variation of the peak positions of Eg and A1g peaks with the number of layers

Fig. 4. Analysis of the transmission spectra of PtSe2. (a) Transmission spectra; (b) Tauc plots, the lines are the optical bandgaps estimated by the intercept method

Fig. 5. Test and fitting results of ellipsometric parameters for PtSe2 films with different layers. (a) Test and fitting results of ψ; (b) test and fitting results of Δ

Fig. 6. Optical constants of PtSe2 films with different layers. (a) Refractive index; (b) extinction coefficient; (c) real part of the dielectric function; (d) imaginary part of the dielectric function

Fig. 7. Temperature-dependent optical constants of PtSe2 films. (a) (c) Refractive index and extinction coefficient of 4L PtSe2; (b) (d) refractive index and extinction coefficient of 6L PtSe2

Fig. 8. The thermo-optical coefficient of PtSe2 films as a function of wavelength
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Table 1. The optimum fitting parameters of Tauc-Lorentz oscillators

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