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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