Abstract
Manganese selenite (MnSeO4) crystalline thin film has been produced with chemical bath deposition on substrates (commercial glass). Properties of the thin film, such as transmittance, absorption, and optical band gap and refraction index have been investigated via UV/VIS Spectrum. The structural properties of orthorhombic form have been observed in XRD. The structural and optical properties of MnSeO4 thin films, deposited at different pH levels were analyzed. Some properties of the films have been changed with the change of pH level, which has been deeply investigated. The grain size of MnSeO4 thin film has reached its highest value at pH 9. The refraction index and extinction coefficient of MnSeO4 thin films were measured to be 1.53, 2.86, 2.07, 1.53 (refraction index) and 0.005, 0.029, 0.014, 0.005 (extinction coefficient) for grain sizes 21, 13, 26, and 5 nm respectively. The band gaps (Eg) of the films were measured to be 2.06, 2.57, 2.04, and 2.76 eV for the grain sizes mentioned above. The value of dielectric constant at pH 10 was calculated as 1.575.
Highlights
Selenium is one of the most important elements of 6A group in periodical table in terms of utilization areas
The grain size of the films is calculated using the peaks of FWHM (020) at pH 11, (021) at pH 10, (111) at pH 9 and (022) at pH 8, obtained through the Scherrer’s method which takes peaks of X-ray diffraction (XRD) patterns
The highest average grain size of MnSeO4 thin films has been found at pH 9
Summary
Selenium is one of the most important elements of 6A group in periodical table in terms of utilization areas. Structural and optical properties natural MnSeO4 mineral thin films, which were produced via chemical bath deposition method, have been investigated. The pH value of the bath has been used to control structural and optical properties of MnSeO4 thin films. We were able to control the structures of the films by controlling pH levels of the baths This caused variations on the grain sizes for each pH level and optic band gaps have been varied . The absorption curve behaved as the reflectance curve and showed an increase with the decrease
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