Abstract
The poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) and reduced graphene oxide (rGO)/PEDOT:PSS have been prepared by spin coating as counter electrodes (CEs) for dye-sensitized solar cells. The optimized 1wt% rGO was dispersed in a solution of PEDOT:PSS for the highest electrical conductivity. The cyclic voltammogram result shows that rGO/PEDOT:PSS CE has a good catalytic activity towards the I−/I3− redox couple compared to Pt CE and PEDOT:PSS CE. The rGO/PEDOT:PSS CE showed a high energy conversion efficiency of 5.1% accompanied by a fill factor of 0.68, which was comparable to those of the Pt CE (4.6%) and PEDOT:PSS (2.4%). Hence, the rGO/PEDOT:PSS is expected to replace the expensive Pt as a promising CE catalyst.
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