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Scale-up of the electrodeposition of ZnO/Eosin Y hybrid thin films for the fabrication of flexible dye-sensitized solar cell modules

: Bittner, F.; Oekermann, T.; Wark, M.

Fulltext (PDF; )

Materials 11 (2018), No.2, Art. 232, 19 pp.
ISSN: 1996-1944
Journal Article, Electronic Publication
Fraunhofer WKI ()
electrochemical deposition; scale-up; zinc oxide; eosin Y; dye-sensitized solar cell; solar module

The low-temperature fabrication of flexible ZnO photo-anodes for dye-sensitized solar cells (DSSCs) by templated electrochemical deposition of films was performed in an enlarged and technical simplified deposition setup to demonstrate the feasibility of the scale-up of the deposition process. After extraction of eosin Y (EY) from the initially deposited ZnO/EY hybrid films, mesoporous ZnO films with an area of about 40 cm² were reproducibly obtained on fluorine doped tin oxide (FTO)-glass as well as flexible indium tin oxide (ITO)–polyethylenterephthalate (PET) substrates. With a film thickness of up to 9 µm and a high specific surface area of up to about 77 m²·cm⁻³ the ZnO films on the flexible substrates show suitable properties for DSSCs. Operative flexible DSSC modules proved the suitability of the ZnO films for use as DSSC photo-anodes. Under a low light intensity of about 0.007 sun these modules achieved decent performance parameters with conversion efficiencies of up to 2.58%. With rising light intensity the performance parameters deteriorated, leading to conversion efficiencies below 1% at light intensities above 0.5 sun. The poor performance of the modules under high light intensities can be attributed to their high series resistances.