Abstract
CuS: PbO, alloyed thin films were successfully deposited on glass substrates under the deposition condition of 40oC of NaOH solution, using two solution based methods: successive ionic layer adsorption and reaction (SILAR) and solution growth technique. The crystallographic studies were done using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The deposited alloyed samples were annealed at 250oC and 1500C. using Master Chef Annealing Machine. Rutherford backscattering Spectroscopy (RBS) analysis confirmed the percentage of the elements of copper, lead, sulphur and oxygen in the alloyed thin films. The optical characterization was carried out using UV-1800 double beam spectrophotometer. Sample cp1 annealed at 250 oC has an optical transmittance of 27% -71% in the ultraviolet region, 71%-83% in the visible and 83%-88% in the near infrared regions of electromagnetic spectrum. The alloyed thin films of samples cp2 of CuS:PbO annealed at 150oC, show optical transmittance of 15%-61% in the ultraviolet region, 61%-59% in the visible, and becomes linear through the near-infrared regions of electromagnetic spectrum. The two samples, have equal direct wide band gap of 3.65±0.05eV. From the spectral qualities, these compounds alloyed thin films may found useful in passive layer in heat and cold mirror application, vulcanization in tyre production due its thermal stability, active multilayer in various types of solar cells, liquid crystal displays, flat panel displays for optoelectronic applications and gas censor applications.
Highlights
The increase in thin film researches is due to their extensive applications in the diverse fields of solar energy conversion, electronics, space science, optics, aircrafts and other industries
Compactness, better performance and reliability coupled with low cost production and low package weight, thin film components are preferred over the bulk counterparts [1]
Copper sulphides (CuS) thin films were deposited on substrates in cycles; one cycle is completed by dipping the substrate first into the beaker containing the cationic precursor and rinsed in a beaker of deionize water, shown in Figure 2.1b and immersed into the third beaker, containing the anionic precursor, shown in Figure 2.1c which, is 0.8M solution of 17.51g of thiourea (C2H4)CS after which the substrates were rinsed in de-ionized water, Figure 2.1d and this is repeated based on the number of chosen cycles[11]
Summary
The increase in thin film researches is due to their extensive applications in the diverse fields of solar energy conversion, electronics, space science, optics, aircrafts and other industries. Among them copper oxide (CuO) based materials have various technological applications in solar energy conversion, ceramics, sensors, catalysis, batteries, solar cells, magnetic storage media, semiconductors, capacitors, diodes, and so forth [6] because of their novel mechanical, electronic, magnetic, and optical properties compared with those of conventional bulk materials. These materials indicate high optical transmission, low electrical resistivity and high transparency in the visible region of the electromagnetic spectrum. There exists a substantial potential in non-conventional source such as solar, wind and tidal energy etc
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