Publication

Abstract : A solution processed method for fabricating transition metal sulfides on fluorine doped tin oxide (FTO) as efficient counter electrodes in iodine/iodide based solar cells has been demonstrated. Conversion efficiencies of 7.01% and 6.50% were obtained for nickel and cobalt sulfides{,} respectively{,} comparable to the conventional thermally platinised FTO electrodes (7.32%). A comparable charge transfer resistance of Ni3S2 and Co8.4S8 to conventional Pt was found to be a key factor for such high efficiencies. Cyclic voltammetry{,} Kelvin probe microscopy{,} Electrochemical Impedance Spectroscopy{,} and Tafel polarization were performed to study the underlying reasons behind such efficient counter electrode performance.