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Articles by G.R. Fajinmi
Total Records ( 3 ) for G.R. Fajinmi
  J.A. Amusan , G.R. Fajinmi , Y.K. Sanusi and S.A. Okewoye
  Chemical Bath Deposition (CBD) technique is employed in depositing prepared Lead Sulphide (PbS) as thin film on glass substrates at varied deposition time. The durations of our deposition are 180, 240 and 300 min. We annealed some prepared samples at 100, 150 and 200C so as to modify their grain boundaries and the remaining samples were left, as they were prepared. The `as prepared` and `annealed` PbS samples are then studied. We measured and recorded the transmittance of each sample at various wavelengths between 400 and 1000 nm using Visible/Ultra-violet Spectro-photometer model, 6405. The effect of deposition time on transmissivity of Lead sulphide is observed. The result shows non-linear relationship between the deposition time and transmissivity of PbS sample. The deposition time of `as prepared` PbS samples increases as transmissivity increases up to an optimum point of transmissivity between 230 and 240 min after which the transmissivity nearly remains constant with further increase in deposition time. The annealed samples initially show increase in transmissiviy with an increasing deposition time but beyond a specific time, termed `critical deposition time`, the transmittance decreases as deposition time increases. Thus, the optimum transmissivity of annealed PbS thin film occurs at this `critical deposition time` (between 235 and 245 min) beyond which the transmittance decreases with further increase in deposition time. Hence, the deposition time is then considered to have great influence on the transmissivity of chemically deposited Lead Sulphide (PbS) thin film and thus influence its electrical and optical characterization.
  G.R. Fajinmi and J.S.A. Adelabu
  Compositional analysis using the energy dispersive X-ray Flourescence EDXRF of chemically deposited lead sulphide (PbS) thin film from a bath ratio of 1:2 (Pb: Tu) is presented, deposition took place at room temperature from chemical bath constituted from Lead Acetate, Triethamolamine, Thiourea and Sodium Hydroxide. Conductivity type measurement on the as-prepared film showed a p-type conductivity with enhanced dark conductivity from 5-30 mA when annealed at 200C for 1 h. The result emphasizes the fact that annealing at a predetermined temperature is essential to produce a good photoconductive PbS film.
  G.R. Fajinmi and J.S.A. Adelabu
  Chemical bath deposition technique for obtaining photoconductivity Bismuth Sulphide (Bi2S3) thin films of thickness of about 0.07-0.19 m is reported. At room temperature, the deposition ranges from 1-7.5 h beyond which the films start to detach from the substrate. These films show a change in dark resistance of 0.2 m for a change of 0.12 m in thickness. The dark conductivity of the film increased by a factor of 3 when annealed at 150C for 2 h. The films showed a photo current to dark current ratio of 75-150 for the as-prepared film under 1 kWm-2 tungsten halogen illumination. These results suggest that post deposited annealing will enhance the performance of the films in the area of optoelectronic applications.
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