ABSTRACT
Thin films
of copper sulphide (CuS) with varying concentrations of mercury (Hg) and nickel
(Ni) impurities (0.0 I M-0.03M) were grown on glass substrates at room
temperature (300K) using chemical bath deposition technique. Spectral
transmittance and reflectance of the thin films were measured with a
spectrophotometer in the UV-Vis-IR region of the electromagnetic spectrum. The
effects of the impurities on other optical spectra obtained theoretically were
quantitatively evaluated from the spectrophotometer data The energy band gap
increased for all Hg impurity concentrations to a maximum of 3.25e V for 0.02M
Hg impurity as against 2.65eV for as grown CuS thin film, while the band gap
decreased for all Ni impurity concentrations to a minimum of 2.00eV for 0.0lM
Ni impurity. The absorbance increased with both Hg and Ni impurity
concentrations while the transmittance decreased with Ni impurities and
increased with Hg impurities. The results also show increase in absorption
coefficient and decrease in reflectance for both Hg and Ni impurities with a
maximum reflectance of 69.8% for as grown thin film down to 13.2% with 0.01 Ni
impurities. Values for the refractive index reduced to 1. 1 with 0.0 IM of both
impurities from a maximum of 2.4 for as grown CuS thin film. Also, results of
the absorbance, transmittance and reflectance as presented here converged at
300 nm and diverged to 900 nm wavelength limit. The electrical properties were
characterized; the films with Ni impurities exhibited high conductivity with a
maximum value of 6666.67x10Q'cm' ', as the concentration of the Ni impurity
increases, the conductivity increases. The films with Hg impurities exhibited
high electrical resistivity with a maximum value of 6643.002cm; as the
concentration of the Hg impurity increases, the conductivity decreases. The XRD
result revealed that the thin films are monocrystalline in nature due to
presence of a peak xiv respectively. The films could be very useful in
different applications; their high absorbance makes them useful in window
coating for people living in the hot climate like Nigeria. They could be useful
in making glasses for protection from sun burns caused by UV radiations. The
properties of poor transmittance in the UV-VIS but moderately high
transmittance in the VIS-NIR exhibited make the film good material for
screening of UV portion of electromagnetic spectrum which is dangerous to human
health and as well hannful to domestic animals. The films can be used for
coating eye glass for protection from sunburn caused by UV radiations. The
index of refraction n >0 makes the thin films good candidates for protective
coatings. The maximum values of optical conductivity of the deposited thin films
are all of the order I 0 14 s· 1 and these high values imply high electrical
conductivity. The results provide basis for specific applications in
microelectronics for fabrication of computer memories, multipler condensers
etc.
ELIZABETH, C (2024). : Effects OF Mercury and Nickel Impurities on the Optical, Electrical and Structural Properties of Copper Sulphide (CuS) Thin Films Prepared by Chemical Bath Deposition Technique :-Mgbaja, Elizabeth C. . Mouau.afribary.org: Retrieved Sep 08, 2024, from https://repository.mouau.edu.ng/work/view/-effects-of-mercury-and-nickel-impurities-on-the-optical-electrical-and-structural-properties-of-copper-sulphide-cus-thin-films-prepared-by-chemical-bath-deposition-technique-mgbaja-elizabeth-c-7-2
CHINYERE, ELIZABETH. ": Effects OF Mercury and Nickel Impurities on the Optical, Electrical and Structural Properties of Copper Sulphide (CuS) Thin Films Prepared by Chemical Bath Deposition Technique :-Mgbaja, Elizabeth C. " Mouau.afribary.org. Mouau.afribary.org, 09 Jan. 2024, https://repository.mouau.edu.ng/work/view/-effects-of-mercury-and-nickel-impurities-on-the-optical-electrical-and-structural-properties-of-copper-sulphide-cus-thin-films-prepared-by-chemical-bath-deposition-technique-mgbaja-elizabeth-c-7-2. Accessed 08 Sep. 2024.
CHINYERE, ELIZABETH. ": Effects OF Mercury and Nickel Impurities on the Optical, Electrical and Structural Properties of Copper Sulphide (CuS) Thin Films Prepared by Chemical Bath Deposition Technique :-Mgbaja, Elizabeth C. ". Mouau.afribary.org, Mouau.afribary.org, 09 Jan. 2024. Web. 08 Sep. 2024. < https://repository.mouau.edu.ng/work/view/-effects-of-mercury-and-nickel-impurities-on-the-optical-electrical-and-structural-properties-of-copper-sulphide-cus-thin-films-prepared-by-chemical-bath-deposition-technique-mgbaja-elizabeth-c-7-2 >.
CHINYERE, ELIZABETH. ": Effects OF Mercury and Nickel Impurities on the Optical, Electrical and Structural Properties of Copper Sulphide (CuS) Thin Films Prepared by Chemical Bath Deposition Technique :-Mgbaja, Elizabeth C. " Mouau.afribary.org (2024). Accessed 08 Sep. 2024. https://repository.mouau.edu.ng/work/view/-effects-of-mercury-and-nickel-impurities-on-the-optical-electrical-and-structural-properties-of-copper-sulphide-cus-thin-films-prepared-by-chemical-bath-deposition-technique-mgbaja-elizabeth-c-7-2