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Polycrystalline thin films of silver oxide were synthesised by chemical bath deposition (CBD) technique. The particle size in the deposited films was found to decrease with increasing bath temperature while the porosity was found to increase with increasing temperature of deposition. The band gap in the film was found to increase with decreasing particle size. The sensitivity in the presence of alcohol was found to increase with working temperature before reaching maximum at 250°C. A maximum sensitivity of ~35% was observed at 250°C in presence of 1000 ppm ethanol for films deposited at highest deposition temperature. [ABSTRACT FROM AUTHOR]

• Ni doped cubic phase CdS thin film was deposited by chemical bath deposition. • Particle size and Band gap decreases with Ni incorporation. • The Urbach energy increases with Ni doping. • AC conductivity increases with Ni doping while impedance decreases. Microstructural properties of CdS thin film synthesized by chemical bath deposition method and influence of Ni were studied in this present work. X-ray diffraction and selected area electron diffraction pattern reveal the presence of cubic phase. Energy dispersive X-ray analysis confirmed the presence of Ni element in nearly stoichiometric films. The particle size of CdS (~16-26 nm) decreased with nickel doping. Bandgap was found to decrease from ~2.41 eV to ~2.24 eV with increase in nickel incorporation. The Urbach energy increases with Ni doping suggesting increase in disorder in the film. The electrical conductivity and dielectric property were investigated in detail using complex impedance spectroscopy. Conductivity increases with the incorporation of Ni in CdS. [ABSTRACT FROM AUTHOR]