Nanocrystalline films of PbS has been deposited on glass substrates by chemical bath deposition method and the effect of pH on the films has been studied. With the increase of pH, the crystallite size increased with the reduction of microstrain and Urbach energy, the direct band gap decreased, and conductivity improved with the maximum value being 5.08x10 −3 (Ωcm) −1. The films deposited at pH=12.46 become highly absorbing in the wavelength range of 350800 nm. This film has also shown highest reflectance which was uniforrm in between 320 to 660 nm.
PbS, pH, Nanocrystalline Films, Chemical bath deposition, Urbach Energy
