Conclusion
In summary we have successfully synthesized CuS thin films deposited at 60 °C by simple chemical bath deposition (CBD) without any surfactant and TiCl4 treatment, could be better counter electrodes towards achieving high photoelectrical conversion efficiency. They are found to possess better electrocatalytic performance than Pt and economical too. An enhanced electrocatalytic activity and lower charge transfer was exhibited by CE0H CE gives the highest efficiency of 4.02%, Jsc of 12.506 mA/cm−2, Voc of 0.602 V and a FF of 53.17% which is far higher than its counterpart Pt which gives an efficiency of (η) 1.45%, Jsc of 06.671 mA/cm−2, Voc 0.559 V and FF of 31.71% respectively. In general, all the CuS CEs were found to produce above 3.41% efficiency. Therefore CuS can be a suitable cost effective CE material with good electrochemical stability to assemble Pt free solar cells.