Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 34, Pages 19613-19618Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b05195
Keywords
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Funding
- CSIRO through OCE Science Leader program
- Australian Government through Australian Renewable Energy Agency (ARENA)
- Australian Solar Institute
- Victorian Government through DSDBI
- Victorian Government through VSA
- Victorian State Government Department of Primary Industry
- Bluescope Steel
- Innovia Films
- Innovia Security
- Bosch (Victorian Organic Solar Cells Consortium)
- Australian National Fabrication Facility (ANFF)
- Commonwealth of Australia
- Victorian Government
- ARC through an ARE fellowship
- Munich Centre for Advanced Photonics (MAP) - German Research Foundation (DFG) via German Excellence Initiative
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Metal charge collectors are an essential component of photovoltaic modules, facilitating charge collection over larger areas. Their application in dye-sensitized solar cells has so far been hampered by two major factors: (1) the redox mediators employed in these photoelectrochemical devices are generally corrosive to metals, and (2) they generally show low overpotentials for their redox reactions on these metal surfaces, which leads to significant recombination losses at the photoanode. Here, a thiolate-based redox mediator, sodium 1-phenyl-1H-5-mercaptotetrazole (T-ph), is shown to form self-assembled monolayers on silver electrodes and to act as an effective corrosion protection layer while also exhibiting high overpotentials on these metals at the photoanode. The anticorrosive properties are strongly dependent on the structure of the thiolate. Replacement of the phenyl group in T-ph with a methyl substituent accelerates the corrosion process by orders of magnitude. Finally, we demonstrate electrolytes in a 60 cm(2) dye-sensitized solar cell comprising unprotected silver charge-collecting the applicability of T-ph-based electrodes.
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