Study on Poly(3,4-ethylene dioxythiophene)-Poly(styrenesulfonate) as a plastic counter electrode in dye sensitized solar cells
2007 (English)In: Journal of Optoelectronics and Advanced Materials, ISSN 1454-4164, Vol. 9, no 4, 1052-1059 p.Article in journal (Refereed) Published
Dye sensitized solar cells with PEDOT-PSS coated directly on flexible polyester substrate as counter electrode have been fabricated. The behavior of such plastic counter electrode in the presence of I/I-3 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 I-3, I-2 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 overoxidation and loss of conductivity in the PEDOT-PSS film. Additionally, the interactions between PEDOT and iodine species may be enlarged because of the partial loss of PSS protective counter ion. That has resulted in decrease of PEDOT-PSS catalytic activity for reduction of I-3 to I in the redox electrolyte and has caused worse cell performance than in case of DSSC with Pt counter electrode.
Place, publisher, year, edition, pages
2007. Vol. 9, no 4, 1052-1059 p.
dye-sensitized solar cells, plastic counter electrode, PEDOT-PSS, photoelectron spectroscopy
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-48021OAI: oai:DiVA.org:liu-48021DiVA: diva2:268917