Nanoscale multilayer PbS thin films fabricated by liquid-liquid interface reaction technique for solar photovoltaic applications

In the present communication, the self-assembly of nanocrystalline PbS at the liquid-liquid interface is reported. The PbS nanocrystals were, subsequently, transformed in the form of thin films by dip coating. The resultant films were characterized by SEM-EDAX, TEM-SAED, XPS and UV-visible spectroscopy. Pyramidal features at the nanometer scale and a sharp excitonic peak at 656 nm are the salient aspects of this work. The band gap of the order of 1.8 eV (associated with the excitonic feature) is ideally suited for solar photovoltaic applications.