CdS thin films were deposited onto glass substrate by the chemical bath deposition method, using cadmium chloride (CdCl 2) as a source of cadmium, thiourea (CS(NH 2) 2) as a source of sulphur, ammonium nitrate (NH 4 NO 3) as buffer salt and ammonia as pH controller and complexing agent. The effects of the deposition temperature and the concentration of ammonium nitrate on the structural, compositional, optical and optoelectrical properties of CdS thin films were investigated. The optimised sample was utilised for fabrication of photodetectors. A high photosensitivity and a short response time was reported for the photodetectors based on the sample with the bath temperature of 65°C and concentration of ammonium nitrate of 1.5 M compare with the other samples.
Non-centrosymmetric superconductors have recently received significant interest due to their intriguing physical properties such as multigap and nodal superconductivity, helical vortex states, as well as non-trivial topological effects. Moreover, large values of the upper critical magnetic field have been reported in these materials. Here, we focus on the study of the temperature dependence of the perpendicular magnetic field of NbRe and NbReN films patterned in micrometric strips. The experimental data are studied within the Werthamer–Helfand–Hohenberg theory, which considers both orbital and Zeeman pair breaking. The analysis of the results shows different behavior for the two materials with a Pauli contribution relevant only in the case of NbReN.
Effects of buffer salt concentration on the rate of deposition, dominated deposition mechanism and subsequently the structural, morphological, and optical properties of cadmium sulfide (CdS) thin films deposited by chemical bath deposition (CBD) on glass substrate were investigated. The precursors were chosen to be cadmium chloride (CdCl2) as the cadmium source, thiourea (CS(NH[Formula: see text]) as the sulfur source, ammonium nitrate (NH4NO3) as the buffer salt and ammonia as the complexing agent and the pH controller. The influence of the NH4NO3 concentration on the structure, morphology, film uniformity, stoichiometry and optical properties of CdS thin films was also studied by X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray (EDX) spectroscope, uv–visible and photoluminescence (PL) spectroscopes. The XRD studies revealed that all the deposited films exhibited a (002)h/(111)c preferred orientation. The crystallite size was increased from 20[Formula: see text]nm to 30[Formula: see text]nm by the increase of concentration of NH4NO3 from 0.5[Formula: see text]M to 2.5[Formula: see text]M. The morphology of CdS thin films were agglomerated spherical particles consisted of smaller particles. The surface of thin films deposited at the NH4NO3 concentration of 0.5[Formula: see text]M was compact and smooth. The increase of the concentration of NH4NO3 decreased the packing density of the films. The optical band gap was in the range of 2.25–2.4[Formula: see text]eV, which was decreased by the decrement of packing density. The PL spectra showed two peaks centered at 400[Formula: see text]nm and 500[Formula: see text]nm which are attributed to violet and band-to-band emissions, respectively.
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