Abstract
A novel transparent honeycomb-like poly(3,4-ethylenedioxythiophene)/multi-wall carbon nanotube (PEDOT/MWCNT) electrode served as a counter electrode (CE) for the bifacial dye-sensitized solar cell (DSSC) has been fabricated on the fluorine-doped tin oxide (FTO) glass using a sacrificial template of poly(methyl methacrylate) for the first time. Cyclic voltammetry and electrochemical impedance spectroscopy measurements indicate that the honeycomb-like PEDOT/MWCNT CE has a higher electrocatalytic activity for the I3−/I− redox reaction and a smaller charge transfer resistance than those of the flat PEDOT CE. Ultraviolet–visible spectrophotometer measurement indicates that the PEDOT/MWCNT CE with honeycomb-like nanostructure demonstrates high transparency for the backside illumination. The bifacial DSSC based on this honeycomb-like PEDOT/MWCNT CE shows conversion efficiencies of 9.07% and 5.62% from front and rear side illumination, respectively, which are higher than those of the bifacial DSSC based on the flat PEDOT CE (7.51% and 3.49% respectively).
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