Abstract
Polycrystalline undoped and Sb doped BaSnO3 powder samples, BaSn1−xSbxO3 (0 ≤ x ≤ 0.1) have been prepared by hydrogen peroxide assisted method. Hydrogen is incorporated into BaSn1−xSbxO3 to tune the defect and optical properties of the parent oxide. Three localized vibrational modes at 2800–3000 cm−1 in Fourier transform infrared spectra originate from positive and neutral charge states of hydrogen. The observation of strong Raman lines indicate a local structural distortion in a cubic phase of BaSnO3. X-ray photoelectron studies indicate Sn4+ and Sb5+ oxidation states of Sn and Sb in doped samples. The replacement of Sn4+ by Sb5+ enhances the optical band gap from 3.14 ± 0.24 eV in undoped to 3.25 ± 0.20 eV in the 10% Sb-doped sample. Hydrogen impurities act as electron donors and also increase the optical band gap. The overall band gap enhancement has been explained by the Burstein-Moss band filling effect. Two electron paramagnetic resonance signals, corresponding to two kinds of oxygen vacancy centres, are strongly influenced by Sb and hydrogen dopants.
Published Version
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