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Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering
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Image of FIG. 1.
FIG. 1.

(a) Pseudodielectric function spectra (solid lines) and best-fit curve (dashed lines) for CdO measured at 100 K. (b) The modeled spectrum (black thick trace) for CdO at 100 K, which is constructed by a sum of five Tauc-Lorentz oscillators (colored lines).

Image of FIG. 2.
FIG. 2.

Real (a) and imaginary (b) parts of the modeled for CdO at various temperatures ranging from 100 to 600 K. Spectra are offset upward from 600 K data by multiples of 1.

Image of FIG. 3.
FIG. 3.

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) .

Image of FIG. 4.
FIG. 4.

(a) Raman scattering spectra for CdO from 200 to 1000 cm at 77, 150, 300, and 450 K. The sharp structures indicated by asterisk (*) symbol are from the -AlO substrate. (b) Raman scattering spectrum for CdO at 77 K in the wavenumber ranging from 240 to 520 cm (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 -AlO are shown as blue and red traces, respectively.

Image of FIG. 5.
FIG. 5.

Dependence of major Raman peaks on temperature. Solid blue circles and solid red squares represent the contributions from CdO and -AlO, respectively. The solid lines are the best fits of our data to a linear function  =  + .


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Table I.

Parameters for the five Tauc-Lorentz oscillators used to construct the spectra of CdO layer.

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Table II.

Parameters for Varshni formula (0), , and obtained by fitting the T-L oscillator energies to Eq. (2) .

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Table III.

Value of the parameters and obtained by fitting the dependence of RS peak wavenumbers on temperature to = + is the linear correlation coefficient (The closer to 1, the better the fit).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temperature-dependent optical properties of epitaxial CdO thin films determined by spectroscopic ellipsometry and Raman scattering