Deposition Time-dependent Study of Structural and Optical Properties of PbS Thin Films Grown by CBD Method

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Author(s): Minakshi Chaudhary, Yogesh Hase, Ashwini Punde, Pratibha Shinde, Ashish Waghmare, Priti Vairale, Vidya Doiphode, Nilesh Patil, Subhash Pandharkar, Mohit Prasad, Sandesh Jadkar*

Journal Name: Recent Innovations in Chemical Engineering
Formerly: Recent Patents on Chemical Engineering

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Thin films of PbS were prepared onto glass substrates by using a simple and cost effective CBD method. 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 increase in deposition time. 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 increase in deposition time these PbS particles are separated from each other without secondary growth. The data obtained from the EDX spectra shows the formation of high-quality but slightly sulfur rich PbS thin films over the entire range of deposition time studied. All films show increase in absorption with increase in deposition time and a strong absorption in the visible and sub-band gap regime of NIR range of the spectrum with red shift in band edge. The optical band gap shows decreasing trend, as deposition time increases but it is higher than the band gap of bulk PbS.

Keywords: PbS thin films, chemical bath deposition, Raman spectroscopy, X-ray diffraction, UV-Vis-NIR spectroscopy

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(E-pub Ahead of Print)
DOI: 10.2174/2405520413999200517123919
Price: $95

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