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The Chemical Bath Deposition Method (CBD) was employed for deposition of
Cd1-xZnxS (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) thin films. The chemically
deposited Cd1-xZnxS thin
films were characterized by using UV-Visible spectrophotometer. Transmission spectra show
the blue shifting of absorption edge as the Zn content increased. The x = 0.8 composition
shows maximum 78 % transmittance. The reflection in the blue portion of the incident
spectrum was decreased as the Zn content increased. The (αhν)2
versus photon energy (hν)
curves shows tuning of band gap with Zn content. The observed band gap was 3.9 eV in the
x = 0.8 composition. The effect of composition on refractive index, absorption index and
other optical dispersion parameters were also investigated. The calculated values of average
excitation energy Eo approximately obey the empirical relation
(Eo=1.2 Eg) obtained from
single oscillator model.
Keywords: Chemical Bath Deposition, band gap, optical constants |
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