(a) Pseudodielectric function spectra (solid lines) and best-fit curve (dashed lines) for CdO measured at 100 K. (b) The modeled ε 2 spectrum (black thick trace) for CdO at 100 K, which is constructed by a sum of five Tauc-Lorentz oscillators (colored lines).
Real (a) and imaginary (b) parts of the modeled ε for CdO at various temperatures ranging from 100 to 600 K. Spectra are offset upward from 600 K data by multiples of 1.
Dependence of the bandgap (solid black circles), T-L oscillator #1 (solid red circles), and T-L oscillator #4 (solid blue circles) energies on temperature. The solid lines correspond to the best fits to the data with Eq. (2) .
(a) Raman scattering spectra for CdO from 200 to 1000 cm−1 at 77, 150, 300, and 450 K. The sharp structures indicated by asterisk (*) symbol are from the r-Al2O3 substrate. (b) Raman scattering spectrum for CdO at 77 K in the wavenumber ranging from 240 to 520 cm−1 (solid circles). The full solid line is obtained by using a multi Gaussian-Lorentzian mixed profile fitting which essentially coincides with the experimental data. Contributions from CdO and r-Al2O3 are shown as blue and red traces, respectively.
Dependence of major Raman peaks on temperature. Solid blue circles and solid red squares represent the contributions from CdO and r-Al2O3, respectively. The solid lines are the best fits of our data to a linear function ν = a + bT.
Parameters for the five Tauc-Lorentz oscillators used to construct the ε 2 spectra of CdO layer.
Parameters for Varshni formula E(0), α, and β obtained by fitting the T-L oscillator energies to Eq. (2) .
Value of the parameters a and b obtained by fitting the dependence of RS peak wavenumbers on temperature to ν = a + bT. R is the linear correlation coefficient (The closer to 1, the better the fit).
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