From identification of electrolyte degradation rates to lifetime estimations in dye solar cells with iodine and cobalt redox couples

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorMiettunen, Kati
dc.contributor.authorPoskela, Aapo
dc.contributor.authorTiihonen, Armi
dc.contributor.authorRendon, Sabine
dc.contributor.authorAxenov, Kirill
dc.contributor.authorKronberg, Leif
dc.contributor.authorLeino, Reko
dc.contributor.authorLund, Peter
dc.contributor.departmentDepartment of Bioproducts and Biosystems
dc.contributor.departmentNew Energy Technologies
dc.contributor.departmentÅbo Akademi University
dc.contributor.departmentUniversity of Helsinki
dc.contributor.departmentDepartment of Applied Physics
dc.date.accessioned2018-04-04T09:37:29Z
dc.date.available2018-04-04T09:37:29Z
dc.date.issued2017
dc.description.abstractDegradation of dye solar cells is a major obstacle in their commercialization. Here we look into how much information on the degradation routes and rates one can extract from accessible measurements. Specifically we focus on tracking the color of the cell since all the main components of a dye solar cell have a specific color, and their color changes with degradation. Furthermore we look into extracting the degradation coefficients based on the specific color changes. One of the most vulnerable components of a dye solar cell is the electrolyte. Here we investigate the effect of two most interesting electrolyte compositions: 1) conventional iodine based electrolyte, which to date dominates the stability records of dye solar cells, and 2) cobalt complex electrolyte, which enables record high efficiencies. UV light is known to be highly detrimental as it destroys charge carriers – typically, a UV filter is recommended, but is it enough to prevent the loss of charge carriers? Here expectedly applying a UV filter improved the performance as the cells without a filter had only 4 ± 1 % of the initial efficiency left after a 1,000 hour light soaking test, whereas those with a filter maintained 90 ± 20 % of their initial efficiency. Applying a UV filter only hindered the loss of the charge carriers, but did not eliminate their degradation. From the color changes of the electrolyte, we could identify the degradation coefficient for these electrolytes. This analysis resulted in a highly relevant discovery: the loss rate of the charge carriers in iodine electrolyte was approximately double compared to cobalt electrolyte. Furthermore we could provide indicative estimates of future lifetimes of cells, which could be highly important in improving the lifetime of dye solar cells.en
dc.description.versionPeer revieweden
dc.format.extent13
dc.format.extent29-41
dc.format.mimetypeapplication/pdf
dc.identifier.citationMiettunen , K , Poskela , A , Tiihonen , A , Rendon , S , Axenov , K , Kronberg , L , Leino , R & Lund , P 2017 , ' From identification of electrolyte degradation rates to lifetime estimations in dye solar cells with iodine and cobalt redox couples ' , Nano Energy Systems , vol. 1 , no. 2 , pp. 29-41 .en
dc.identifier.issn2514-4944
dc.identifier.otherPURE UUID: 693276bf-5c7b-4f3c-b37e-5f937b1efc59
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/693276bf-5c7b-4f3c-b37e-5f937b1efc59
dc.identifier.otherPURE LINK: http://10.24274/nes.2016
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/18713913/Miettunen_etal_NanoEnergySystems_1_29_2017.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/30581
dc.identifier.urnURN:NBN:fi:aalto-201804042044
dc.language.isoenen
dc.relation.ispartofseriesNano Energy Systemsen
dc.relation.ispartofseriesVolume 1, issue 2en
dc.rightsopenAccessen
dc.titleFrom identification of electrolyte degradation rates to lifetime estimations in dye solar cells with iodine and cobalt redox couplesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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