Abstract
Background: Thin films of PbS were prepared onto glass substrates by using a
simple and cost-effective CBD method.
Methods: The influence of deposition time on structural, morphology and optical properties
have been investigated systematically. The XRD analysis revealed that PbS films are polycrystalline
with preferred orientation in (200) direction. Enhancement in crystallinity and
PbS crystallite size has been observed with an increase in deposition time. The formation of
single-phase PbS thin films has been further confirmed by Raman spectroscopy. The surface
morphology analysis revealed the formation of prismatic and pebble-like PbS particles and
with an increase in deposition time, these PbS particles are separated from each other without
secondary growth. The data obtained from the EDX spectra show the formation of high-quality
but slightly sulfur-rich PbS thin films over the entire range of deposition time studied.
Results and Conclusion: All films show an increase in absorption with an increase in deposition
time and strong absorption in the visible and sub-bandgap regime of the NIR range of
the spectrum with red-shift in band edge. The optical band gap shows a decreasing trend, as
deposition time increases but it is higher than the bandgap of bulk PbS.
Keywords:
PbS thin films, Chemical bath deposition, Raman spectroscopy, X-ray diffraction, UV-Vis-
NIR spectroscopy, XRD analysis.
Graphical Abstract
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