12 November 2007 Dye sensitized solar cells with a plastic counter electrode of poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate)
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We report on dye sensitized solar cells with PEDOT-PSS coated directly on flexible polyester substrate as counter electrode. The behavior of such plastic counter electrode in the presence of I - /I3 redox electrolyte has been investigated with X-ray photoelectron spectroscopy. We have found that some of iodine species are "trapped" within the PEDOT-PSS layer. The presence of I3 - , I2 and PEDOT charge transfer complexes with iodine species may block the surface of the electrode. Furthermore, the PEDOT may be further oxidized (p-doped) during cell operation, which in turn may cause over oxidation and loss of conductivity in the PEDOT-PSS film. The interactions between PEDOT and iodine species may be enlarged because of the partial loss of PSS protective counter ion. The result is a decrease of PEDOT-PSS catalytic activity for reduction of I3 - to I - in the redox electrolyte and worse cell performance than in the case of DSSC with Pt counter electrode.
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Anna Kanciurzewska, Anna Kanciurzewska, Ewa Dobruchowska, Ewa Dobruchowska, Amir Baranzahi, Amir Baranzahi, Elin Carlegrim, Elin Carlegrim, Ana Fahlman, Ana Fahlman, Mats Fahlman, Mats Fahlman, Mihai A. Gîrţu, Mihai A. Gîrţu, } "Dye sensitized solar cells with a plastic counter electrode of poly(3,4-ethylene dioxythiophene)-poly(styrenesulfonate)", Proc. SPIE 6656, Organic Photovoltaics VIII, 665611 (12 November 2007); doi: 10.1117/12.735830; https://doi.org/10.1117/12.735830

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