ABSTRACT
Lead sulphide (PbS) has encountered acute research concern because of its tunable band gap and ease of solution processing. The basic reasons behind this research are its Bohr radius of PbS, i.e. 18 nm; its high dielectric constant; and its high career mobility. Hence, PbS shows strong quantum size effects for relatively large size. Also, their absorption edge can be tuned to anywhere from red to violet covering the entire visible spectrum. Hence, PbS nanocrystalline (NC) form is utilized mostly in the photodetectors and solar cells using chemical route. In this work, PbS NC materials and films were prepared using different sulphur sources. After optimizing sulphur source, the NC PbS films were deposited on four different fabric cloths using dip coating method. In this method, the dipping time varied from 48 to 108 minutes as it requires allowing fabric to absorb precursor solution. Prepared samples were characterized by X-Ray Diffraction (XRD), FTIR (Fourier transform infrared spectroscopy), Scanning Electron Microscope (SEM), optical, and electrical methods. XRD confirms the pure PbS NC structure formation. FTIR and optical properties indicate the presence of the pure PbS material with its significant features. The photoconductivity measurements are utilized to identify the photoresponse of the NC PbS coating onto the fabric.
