Synthesis and Characterization of Pb(S, Se)Thin Films.

1064 words 5 pages
Studies on chemically deposited Pb(S,Se) thin films
J. D. Chaudhari *, R.D. Chaudhari * *, Dr. R. H. Bari + Department of Physics, G. D. M. Arts, K. R. N. Commerce & M. D. Science College, Jamner.Pin – 424 206 Abstract : Thin films of Pb(S,Se) [lead sulfoselenide] have been prepared on glass substrate at 50°C by simple chemical bath deposition technique. The starting materials used for deposition were lead acetate, tri-sodium citrate, sodium sulphite and elemental selenium. Ammonium hydroxide solution was used to adjust pH of the bath. In order to obtain good quality thin films, time, deposition temperature and pH of the solution were optimized and they are found to be 1 hour, 50°C and 10 respectively. Characterization
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3.2. Optical studies: Fig. 2 Plot of optical absorbance versus wavelength  (nm) Optical absorption studies of Pb(S,Se) film was carried out in the wavelength () range of 300-1100 nm at room temperature. The variation of absorbance with the wavelength () is shown in Figure 2. The band gap energy of the sample was calculated from the absorption edge of the spectra. The calculated band gap energy of Pb(S,Se) was found to be 1.92 eV.

3.3 Electrical studies Electrical conductivity of the Pb(S,Se) thin film was measured by using four-probe method in the temperature range of 308-423 K. Figure 3 shows variation of logarithm of conductivity with an inverse of temperature. It is clear from Figure 3 that the conductivity increases with increase in temperature indicating the semiconducting nature of Pb(S,Se).
4. Conclusions:
Thin film of lead sulfoselenide can be prepared by simple chemical bath deposition technique on to the glass substrate at low temperature. The XRD of the sample clearly indicates that the synthesized material is of Pb(S,Se) which is polycrystalline in nature. From electrical study it conclude that the synthesized material is semiconducting in nature.
The authors are thankful to Head, Department of Physics and Dr. V.V. Bhaskar, Principal, G.D.M. Arts, K.R.N. Commerce and M.D. Science College, Jamner for providing laboratory facilities for this work. The authors are also thankful to Prof. P.P.