Abstract
Strontium (Sr) doped lead sulfide (PbS) thin films have been deposited via spray pyrolysis for use in electrochemical and nonlinear optical applications. All films show the PbS fcc lattice. EDS spectra confirmed Sr in doped films. Doping PbS with Sr increases transparency and lowers the band gap from 1.99 to 1.87 eV. Lead sulfide heteropolar diatomic molecules produce FTIR peaks at 1446, 1384, and 993 cm−1. Adding Sr to PbS increased its nonlinear refractive index. The enhanced nonlinear absorption ability with Sr doping was corroborated by their wider valley range. Thin films of PbS:Sr exhibit reverse saturable absorption (RSA). Electrochemical impedance spectroscopy (EIS) studies indicated that PbS's charge transfer resistance (Rct) increased with Sr doping. The higher specific capacitance and lower Rct values realized for the 4 wt% Sr-doped sample confirmed its suitability for supercapacitor applications.
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