Photoelectrochemical performance of surfactant (polyvinyl alcohol) assisted PbS thin films grown by chemical route
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Polyvinyl alcohol is used as a surfactant in the chemical bath deposition of PbS thin films, which causes compact, pinhole free and uniform PbS thin films. Influence of deposition time on the structural, optical, morphological, compositional, electro-chemical and photo-electrochemical (PEC) properties of the PbS thin films are studied. The charge transfer resistance is analysed using electrochemical impedance spectroscopy. The best PEC device fabricated using optimized deposition time (3 h) showed short circuit current density (Jsc) of 1.68 mA. After annealing the optimised P63 sample at 75 °C for 1.5 h the composition changed from Pb rich to near stoichiometric. For typical PA sample Jsc improves to 2.13 mA and photo conversion efficiency advances from 0.045 to 0.072%.
KeywordsChemical Bath Deposition Heterojunction Solar Cell Short Circuit Current Density Photoelectrochemical Performance Reaction Bath
Authors wish to acknowledge the DAE-BRNS, Mumbai, India for financial support through major research project (No. 2013/36/29-BRNS/2351) and Physics Instrumentation Facility Centre (PIFC), Department of Physics, Shivaji University, Kolhapur for facilitating characterization facilities. The authors are also thankful to Miss. A. B. Nagare for the her significant effort for improving the quality of SEM images. One of the authors (S. S. Nikam) is thankful to UGC New Delhi, for awarding fellowship through UGC-BSR scheme.
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