Chemical Bath Deposition of Lead Sulphide (PbS) Thin Film and their Characterization

Abstract

Thin film deposition of PbS is conveniently carried out by chemical reactions of lead acetate with thiourea at room temperature. Energy dispersive analysis of X-ray (EDAX), X-ray diffraction (XRD), selected area electron diffraction patterns (SAED), UV-Vis-NIR spectrophotometer, Scanning Electron Microscopy (SEM), Atomic force microscopy (AFM), Photoluminescence (PL) and Raman spectroscopy techniques are used for characterizing thin films. EDAX spectra shows that no impurity is present and XRD pattern indicates face centered cubic structure of PbS thin films. The average crystallite size obtained using XRD is about 15nm calculated using Scherrer’s formula and that determined from Hall-Williamson plot was found to be 18nm. SAED patterns indicate that the deposited PbS thin films are polycrystalline in nature. Blue shift due to quantum confinement was seen from the UV-Vis-NIR absorption spectra of thin film in comparison with bulk PbS. The Photoluminescence spectra obtained for thin film with different excitation sources shows sharp emission peaks at 395nm and its intensity of photoluminescence increases with increasing the excitation wavelength. Raman spectroscopy of deposited thin film was used to study the optical phonon modes at an excitation wavelength of 488nm using (Ar+) laser beam.

Lead ethyl dithiocarbamates: efficient single-source precursors to PbS nanocubes

“…The Williamson–Hall (WH) plot is a useful tool for graphically demonstrating the hkl -dependence of broadening within a diffraction pattern [49]. A plot of β cos θ / λ against 4sin θ / λ , which is the Williamson–Hall plot, gives a linear plot with strain as the slope and particle size as the inverse of the intercept (electronic supplementary material, figure S1) [50]. The positive slope in the Williamson–Hall plot implies that tensile strain was dominant in all the PbS thin films [51].…”

Structural and Optical Properties of PbS Thin Films Deposited by Chemical Bath

“…These two properties make these films very suitable for solar cell applications and infrared detection [3]. The structure of PbS thin films was indicated to be cubic face centered [3,4]. PbS thin films usually show a p-type conduction, and their direct band gap can be varied in a broad range, it can be widened to the visible region by forming nanocrystals [5].…”

Enhancement in dye removal by photocatalytic degradation using metal oxide nanoparticles embedded on activated carbon powder and study of their antibacterial activity

“…From this XRD plots, we further calculated crystallite size (D) and micro strain (ε) for both the samples using standard equations reported in [26,29] and obtained values are tabulated in table 1. It also shows that crystallite size is found to lower for CuO@ACP in comparison to ZnO@ACP and positive values of micro strain in both cases represents the tensile strain to be dominant.…”