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Improved efficiency and stability of flexible dye sensitized solar cells on ITO/PEN substrates using an ionic liquid electrolyte

Han, Yu, Pringle, Jennifer M. and Cheng, Yi-Bing 2015, Improved efficiency and stability of flexible dye sensitized solar cells on ITO/PEN substrates using an ionic liquid electrolyte, Photochemistry and photobiology, vol. 91, no. 2, pp. 315-322, doi: 10.1111/php.12399.

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Title Improved efficiency and stability of flexible dye sensitized solar cells on ITO/PEN substrates using an ionic liquid electrolyte
Author(s) Han, Yu
Pringle, Jennifer M.ORCID iD for Pringle, Jennifer M. orcid.org/0000-0002-2729-2838
Cheng, Yi-Bing
Journal name Photochemistry and photobiology
Volume number 91
Issue number 2
Start page 315
End page 322
Total pages 8
Publisher Wiley
Place of publication Weinheim, Germany
Publication date 2015-01-01
ISSN 0031-8655
1751-1097
Summary Flexible dye-sensitized solar cells (DSSCs) built on plastic substrates have attracted great interest as they are lightweight and can be roll-to-roll printed to accelerate production and reduce cost. However, plastic substrates such as PEN and PET are permeable to water, oxygen and volatile electrolyte solvents, which is detrimental to the cell stability. Therefore, to address this problem, in this work, an ionic liquid (IL) electrolyte is used to replace the volatile solvent electrolyte. The initial IL-based devices only achieved around 50% of the photovoltaic conversion efficiency of the cells using the solvent electrolyte. Current-voltage and electrochemical impedance spectroscopy (EIS) analysis of the cells in the dark indicated that this lower efficiency mainly originated from (i) a lack of blocking layer to reduce recombination, and (ii) a lower charge collection efficiency. To combat these problems, cells were developed using a 12 nm thick blocking layer, produced by atomic layer deposition, and 1 μm thick P25 TiO2 film sensitized with the hydrophobic MK-2 dye. These flexible DSSCs utilizing an IL electrolyte exhibit significantly improved efficiencies and a <10% drop in performance after 1000 h aging at 60°C under continuous light illumination.
Language eng
DOI 10.1111/php.12399
Field of Research 030303 Optical Properties of Materials
091205 Functional Materials
Socio Economic Objective 850504 Solar-Photovoltaic Energy
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30076921

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Thu, 17 Sep 2015, 15:32:35 EST

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