AI Article Synopsis
- The study explores the use of a conducting polymer called PEDOT doped with iron(III) tris-p-toluenesulfonate (PEDOT:Tos) as a counter electrode in dye-sensitized solar cells (DSCs) on both FTO and plain glass substrates.
- The PEDOT:Tos counter electrodes achieved a power conversion efficiency (PCE) of 6.3%, comparable to the 6.1% from conventional platinized FTO electrodes.
- Impedance spectroscopy revealed that PEDOT:Tos has significantly lower charge-transfer resistance (5 to 10 times lower) than platinum-based counter electrodes, but the nanoporous structure limits the effective catalytic area under operational conditions.
Article Abstract
Conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with iron(III) tris-p-toluenesulfonate (PEDOT:Tos) having metallic conductivity was coated onto fluorine-doped tin oxide (FTO) glass and plain glass substrates and used as a counter electrode (CE) in a dye-sensitized solar cell (DSC) with a [Co(bpy)3](3+/2+) complex redox shuttle. DSCs with PEDOT:Tos/glass CE yielded power conversion efficiencies (PCE) of 6.3%, similar to that of DSCs with platinized FTO glass CE (6.1%). The PEDOT:Tos-based counter electrodes had 5 to 10 times lower charge-transfer resistance than the Pt/FTO CE in DSCs, as analyzed by impedance spectroscopy. More detailed studies in symmetrical CE-CE cells showed that the PEDOT:Tos layers are nanoporous. Not all internal area can be used catalytically under solar cell conditions and effective charge-transfer resistance was similar to that of Pt/FTO.
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