Abstract
The optical properties of sol-gel spin-coated ZnO and F-doped ZnO (FZO) thin films were investigated using ultraviolet-visible and temperature-dependent photoluminescence spectroscopies. The FZO films showed on average of > 80% optical transmittance over the entire visible region, and the transmittance spectra and the optical bandgaps were blueshifted owing to the Burstein-Moss effect. The 4 at% FZO film showed the lowest Urbach energy and, thus, the best crystallinity of all the films. Changes in the free exciton, neutral-donor-bound exciton (D0X), donor-acceptor pair, and second-order longitudinal optical phonon replica peaks were represented from the temperature-dependent photoluminescence spectra. The strength of the exciton-phonon coupling was investigated using the Bose-Einstein approximation to fit the experimental data, and the thermal activation energies of the as-deposited ZnO and 4 at% FZO thin films were determined using Arrhenius plots for the integrated PL intensities of the D0X peak.
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Yoon, H., Choi, H., Leem, JY. et al. Optimizing the optical properties of fluorine-doped ZnO thin films deposited by sol-gel spin-coating. Journal of the Korean Physical Society 65, 509–514 (2014). https://doi.org/10.3938/jkps.65.509
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DOI: https://doi.org/10.3938/jkps.65.509