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Performance and stability of dye solar cells on stainless steel

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Miettunen, Kati
dc.date.accessioned 2012-08-23T07:24:08Z
dc.date.available 2012-08-23T07:24:08Z
dc.date.issued 2009
dc.identifier.isbn 978-952-248-105-4
dc.identifier.isbn 978-952-248-104-7 (printed) #8195;
dc.identifier.issn 1795-4584
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/4664
dc.description.abstract This study is on nanostructured dye solar cells which are easy to manufacture and use low cost materials. Dye solar cells have conventionally been deposited on conductive glass sheets. To reduce the costs and enable roll-to-roll mass production, the glass substrates should be replaced with flexible metal and plastic substrates. The change of the substrates has a profound effect on the cell, e.g. on electrochemical properties, optics, temperature treatments, and lifetime which all change when using alternative substrates. In this work, the focus is on using stainless steel and ITO-PET substrates in dye solar cells. The electrochemical characteristics of the substrates were analyzed and the need for additional coatings to improve the performance or the stability was evaluated. The optimization of the other cell components in different metal-plastic cell configurations was also examined. An important part of the work was to decouple the effects of the different cell components on the cell performance. For this purpose, a method to study individual electrode performance based on electrochemical impedance measurements of a complete cell is presented. Issues related to the up-scaling of the cell, namely current collection and spatial performance distribution, are also covered in this work. A novel, segmented cells configuration is presented to study the spatial performance distribution. It was discovered that there are large variations in the cell performance leading to significant efficiency losses. The spatial distribution was linked with the usual electrolyte filling technique which resulted in an uneven distribution of a common electrolyte component, 4-tert-butylpyridine. Finally, the lifetime of the stainless steel based cells was examined. Interestingly, the cells with stainless steel photoelectrode substrates aged much faster than those with stainless steel counter electrode substrates. To examine the aging mechanisms, a segmented cell design was also developed specially for the degradation studies. With the segmented cells, it could be confirmed that the degradation of the stainless steel photoelectrode cells was not due to changes in the electrolyte. The aging of the stainless steel counter electrode cells was, on the contrary, linked with the corrosion of the stainless steel substrate by the electrolyte. en
dc.format.extent Verkkokirja (1897 KB, 46 s.)
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Teknillinen korkeakoulu en
dc.relation.ispartofseries TKK dissertations, 185 en
dc.relation.haspart [Publication 1]: Kati Miettunen, Janne Halme, Minna Toivola, and Peter Lund. 2008. Initial performance of dye solar cells on stainless steel substrates. Journal of Physical Chemistry C, volume 112, number 10, pages 4011-4017. en
dc.relation.haspart [Publication 2]: Kati Miettunen, Janne Halme, Paula Vahermaa, Tapio Saukkonen, Minna Toivola, and Peter Lund. 2009. Dye solar cells on ITO-PET substrate with TiO2 recombination blocking layers. Journal of The Electrochemical Society, volume 156, number 8, pages B876-B883. en
dc.relation.haspart [Publication 3]: Kati Miettunen, Janne Halme, and Peter Lund. 2009. Spatial distribution and decrease of dye solar cell performance induced by electrolyte filling. Electrochemistry Communications, volume 11, number 1, pages 25-27. en
dc.relation.haspart [Publication 4]: Kati Miettunen, Janne Halme, and Peter Lund. 2009. Segmented cell design for improved factoring of aging effects in dye solar cells. Journal of Physical Chemistry C, volume 113, number 23, pages 10297-10302. en
dc.relation.haspart [Publication 5]: K. Miettunen, J. Halme, T. Saukkonen, T. Peltola, M. Toivola, and P. Lund. 2009. Performance degradation of dye solar cells on flexible stainless steel substrates. In: Proceedings of the 24th European Photovoltaic Solar Energy Conference. Hamburg, Germany. 21-25 September 2009, accepted for publication. en
dc.relation.haspart [Publication 6]: K. Miettunen, M. Toivola, J. Halme, J. Armentia, P. Vahermaa, and P. Lund. 2007. Optimization of dye-sensitized solar cells on stainless steel. In: Proceedings of the 22nd European Photovoltaic Solar Energy Conference. Milan, Italy. 3-7 September 2007, pages 512-515. en
dc.subject.other Energy en
dc.title Performance and stability of dye solar cells on stainless steel en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.department Teknillisen fysiikan laitos fi
dc.subject.keyword dye solar cell en
dc.subject.keyword stainless steel en
dc.subject.keyword nanostructures en
dc.subject.keyword impedance spectroscopy en
dc.identifier.urn URN:ISBN:978-952-248-105-4
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
local.aalto.digifolder Aalto_65006
local.aalto.digiauth ask

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