Applied Physics
Husam Nahedh; Odai N. Salman; Mukhlis M. Ismail
Abstract
In this study, sodium bismuth titanate ferroelectric ceramics with a nanoscale structure and low iron content (NBTF) were prepared, providing an alternative to lead-based materials. Lead poses environmental and health risks due to its toxicity. NBTF aims to develop a more sustainable ferroelectric composition. ...
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In this study, sodium bismuth titanate ferroelectric ceramics with a nanoscale structure and low iron content (NBTF) were prepared, providing an alternative to lead-based materials. Lead poses environmental and health risks due to its toxicity. NBTF aims to develop a more sustainable ferroelectric composition. The structural, optical, and electrical properties of Na0.5Bi0.5Ti1-xFexO3-0.5x (x=0.06) were investigated. X-ray diffraction revealed the material crystallizes in the rhombohedral phase, with crystallite size of approximately 19.1 nm in size. Infrared and Raman spectroscopy confirmed the formation of a perovskite structure containing Fe ions, evidenced by Ti-O stretching and O-Fe-O bending vibrations. Raman spectroscopy also identified a broad peak at high frequencies, suggesting the generation of oxygen vacancies induced by the dopant. Electrical characterization demonstrated semiconductor behavior with a bandgap of 1.84 eV, showing potential for optoelectronic applications. The study focused on the effect of oxygen vacancies on electrical conductivity. Furthermore, a nano-perovskite heterojunction photodiode comprising Al/p-Si/NBTF/Ag was successfully fabricated and evaluated. Under reverse bias, photocurrent increased compared to the dark state with rising illumination intensity. Device parameters including reaction order, ideality factor, and carrier lifetime were calculated. Collectively, these results indicate promise for integrating this heterostructure photodiode into electronic circuitry applications.
Nanotechnology
Aseel S. Jasim; Odai N. Salman
Abstract
In this work, we reported a study on the hydrothermal process for the preparation of TiO2 NRs films on FTO substrate using two different solutions, the first consisting of (ethanol and titanium butoxide) and the second consisting of (HCl, DIW and titanium butoxide). The study of structural, morphological, ...
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In this work, we reported a study on the hydrothermal process for the preparation of TiO2 NRs films on FTO substrate using two different solutions, the first consisting of (ethanol and titanium butoxide) and the second consisting of (HCl, DIW and titanium butoxide). The study of structural, morphological, optical and electrical properties helped to identify the characteristics of the TiO2 films prepared with the different solvents. The first sample (TO1) exhibited an anatase phase crystal structure with an energy gap of (3.2 eV), while the second (TO2) showed a rutile phase with an energy gap of (3 eV). The (nanorod) morphology was observed in the (TO2) sample, while irregular grains were found in the (TO1) sample. Transmission measurements were performed to analyze the optical properties, which showed that both samples were transparent in the visible wavelength range, with the (TO2) sample with rutile phase exhibiting higher absorption coefficients. The activation energy was (0.0226) eV and (0.0643) eV for the two samples (TO1) and (TO2), respectively. The n-type conductivity was confirmed by Hall effect measurements for both samples. The highest conductivity (300.655) (Ω-1.cm-1) and the highest carrier consternation (1.07355 ×1017) (cm-3) were obtained for sample (TO1).
