Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Conducting polymers have been studied as a substitute for platinum to construct a counter electrode for dye-sensitized solar cell (DSSC). Poly(3,4-ethylenedioxythiophene) (PEDOT) was found to have sufficiently high catalytic activity for practical use as a counter electrode [1] and as a hole transport phase [2]. In this work, PEDOT film electrodes were prepared by electrochemical polymerization of bis-ethylenedioxythiophene (bis-EDOT) on FTO glass with potential at 1.5 V. Scanning electron microscope (SEM) image showed that PEDOT was uniformly deposited on the FTO glass with rough and porous surface. The electrodes were assembled with TiO2 photoelectrodes sensitized with N719, carminic acid and CH3NH3PbI3. The poly(ethylene oxide) (PEO) - based solid polymer electrolytes were modified for each different sensitizers. The overall conversion efficiencies of N719 and carminic acid sensitized DSSCs using PEDOT counter electrodes were 4.38% and 1.09 % respectively under AM 1.5 and were comparable with DSSCs using Pt electrodes (4.38% and 0.91% respectively). However, the performance of perovskite solar cell using PEDOT as counter electrode was less than 1% and need to be further developed.
SEM images of (a) Pt counter electrode and (b) PEDOT counter electrode
[1] Bay, L.; West, K.; Winther-Jensen B.; Jacobsen, T. Electrochemical reaction rates in a dye-sensitized solar cell --- the iodide / tri-iodide redox system. Sol. Energ. Mat. Sol. Cells 2006, 90:341-351. [2] Kim, Y.; Sung, Y.-E.; Xia, J.-B.; Lira-Cantu, M.; Masaki, N.; Yanagida, S. Solid-state dye-sensitized TiO2 solar cells using poly (3,4-ethylenedioxythiophene) as substitutes of iodine / iodide electrolytes and noble metal catalysts on FTO counter electrode. J. Photoch. Photobio. A. 2008, 193:77-80.
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