Poly(3,4-ethylenedioxypyrrole), PEDOP Counter Electrode For Copper Complex Redox Shuttles Based Dye Sensitized Solar Cells

Su Htike Aung^a, Kazuteru Nonomura^a, Than Zaw Oo^a, Shaik M. Zakeeruddin^b, Nick Vlachopoulos^a, Anders Hagfeldt^a, Michael Grätzel^b

^aEcole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

^bLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)

Benidorm, Spain, 2018 May 28th - 31st

Organizers: Emilio Palomares and Rene Janssen

Poster, Su Htike Aung, 290
Publication date: 21st February 2018

Poly(3,4-ethylenedioxypyrrole) (PEDOP) is successfully applied as counter electrode (CE) in dye-sensitized solar cells (DSSCs) [1-4] with a liquid electrolyte containing a CuI/CuII –based redox mediator for the first time. PEDOP was applied in the past as hole-transporting material in SDDCs [5]. The PEDOP counter electrode was prepared by electrochemical deposition at constant current (galvanostatic mode) using a three-electrode setup. For comparison, poly(3,4-ethylenedioxythiophen)e (PEDOT)-based counter electrodes of similar structure [6 ]were also used. In preliminary experiments, we observed higher photocurrent efficiency (PCE) and fill factor (FF) values for PEDOP counter electrode-based DSSCs than for PEDOT-based DSSCs. By applying a PEDOP CE in a DSSC with the metal-free sensitizer Y123 (Dyenamo) and the CuI/CuII redox couple in an acetonitrile-based electrolyte [6], we attained under simulated full-sun AM1.5 irradiation a PCE of 8.6%, with a short-circuit current (Jsc) of 11.2 mAcm-2, an open-circuit voltage (Voc) of 1.038 V, and a fill factor (ff) of 0.73. Under 10% sunlight the corresponding values were PCE= 11.5 %, Jsc=1.68 mAcm-2, Voc=0.949 V, and ff=0.76. By applying a PEDOT CE to a similar DSSC, the corresponding values were under full sun PCE=8.0%, Jsc=11.0 mAcm-2, Voc= 1.015 V, and ff=0.72, and under 10% sun PCE=10.2%, Jsc=1.60mA cm-2,Voc=0.990V, and ff= 0.73. Further planned research involves the application of a number of characterization techniques, including electrochemical impedance spectroscopy, cyclic voltammetry, scanning electron microscopy, and X-ray diffraction. In addition, long-term stability tests will be performed.

Molecular Structure of EDOP.

REFERENCES

[1] N. Vlachopoulos et al., J. Am. Chem. Soc. 1988, 110, 1216-1220.

[2] B. O’Regan and M. Grätzel, Nature 1991, 353, 737–740. 

[3] A. Hagfeldt et al., Chem. Rev. 2010, 110, 6595–6663. 

[4] H. Ellis et al., Electrochimica Acta 107 (2013) 45–51.

[5] J. Zhang et al., ChemPhysChem 2014, 15, 1043 – 1047.

[6] Y Saygili et al., J. Am. Chem. Soc. 2016, 138, 15087−15096.

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