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An ultrahigh photosensitive diode was developed using a Cu-doped CeO2 thin film through spray pyrolysis processing, which has made a unique contribution in the field of optoelectronic device fabrication process. Phase identification revealed a good arrangement of atoms in the as-prepared nanostructured thin films via structural analysis. The formation of wire-shaped nanorods was confirmed. Elemental distribution and their valence states were systematically monitored using X-ray photoelectron spectroscopy analysis, where the presence of Ce3+ was evidenced. Good mechanical properties were obtained owing to the Cu-doping in the cerium host matrix, which was investigated by nano-indentation. Bandgap energy fluctuation was the root cause for electrical conductivity. The present work revealed a decrease in the band gap energy upon Cu-doping alters the electrical conductivity. An as-fabricated photodiode demonstrated superior detectability upon Cu-doping. In the depletion region, on account of a high surface-to-volume ratio, the generation of electron–hole pairs increased along with photoresponsivity with increases in the quantum efficiency and current gain. [ABSTRACT FROM AUTHOR]

Zn-doped TiO2 films were deposited on ultrasonically treated alumina substrates via the automatic nebulizer spray pyrolysis method. In this study, the thickness of the as-prepared films was gradually reduced, and their Brunauer–Emmett–Teller (BET) surface area and pore volume results were notably improved; in addition, values for the blue-shifted sharp edge absorption with an enlarged bandgap (Eg) were revealed in the deposited films. The agglomerated granular form has evolved into tiny grains with porous brighter particles scattered over the surface of the coated films. The sensing performance to reducing gases for combustible gas of ammonia (NH3) and volatile organic compounds of methanol (CH4O) and formaldehyde (HCHO) with the function of operating temperature and gas concentration were studied, and the highest sensing response of the hazardous formaldehyde (HCHO) reducing gas was noticed. [ABSTRACT FROM AUTHOR]

The effect of variant high boiling point solvent combinations in the synthesis and photo-sensing characteristics of tin disulfide (SnS2) thin nanosheets were investigated. Solvent dependent single-phase formation was observed by powder X-ray diffractometry (XRD), and results were verified with Raman spectroscopy measurements. Particles synthesized with only oleylamine show a mixed-phase, and two other solvent combinations such as oleylamine + oleic acid + n-octadecene, and oleylamine + oleic acid, show single-phase 2H–SnS2, without phase contamination. Scanning and transmission electron microscopes were used to verify the orbicular and hexagonal shape of synthesized SnS2 nanosheets. Well-characterized samples were employed to fabricate heterojunction photosensitive diodes using a p-type silicon substrate. Light-responsive measurement results of fabricated diodes indicate that the oleylamine + oleic acid synthesized sample show very high light-sensitivity, and the fill factor value of a fabricated diode is closer to the ideal diode. [ABSTRACT FROM AUTHOR]