Towards metal free counter electrodes for dye-sensitized solar cells

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Halme, Janne, Dr., Aalto University, Department of Applied Physics, Finland
dc.contributor.advisor Miettunen, Kati, Dr., Aalto University, Department of Applied Physics, Finland Hashmi, Syed Ghufran 2014-04-29T09:00:11Z 2014-04-29T09:00:11Z 2014
dc.identifier.isbn 978-952-60-5626-5 (electronic)
dc.identifier.isbn 978-952-60-5625-8 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract This thesis provides a technical overview of results from addressing the critical steps in preparing counter electrodes for dye-sensitized solar cells (DSC) on flexible substrates (mainly plastics) to pave the way towards low-cost DSCs. The aim was to develop low-temperature counter electrode inks and pastes that could be suitable for high volume manufacturing processes. A special focus was given on the mechanical stability (flexibility and adhesion) of the materials that were deposited through a low-temperature route. Different low temperature inks and pastes based on carbon composites were tested as a replacement to expensive platinum nanoparticles based catalyst layer and showed good mechanical stability, comparable photovoltaic performance and low charge transfer resistance in complete dye-sensitized solar cells. Indium doped tin oxide (ITO) layer that is normally used as a conductor on plastic substrates was successfully replaced with a single walled carbon nanotube (SWCNT) film deposited as a low-temperature curable ink on polyvinyl chloride (PVC) substrate. The SWCNT films exhibited remarkably good mechanical stability when subjected to bending and tape adhesion tests. Coating the film with a thin layer of conducting polymer poly (3, 4-ethylenedioxythiophene (PEDOT) increased its catalytic performance comparable to a reference platinum counter electrode. Relevant to scaling up DSC preparation, a two way electrolyte filling method was studied as a means to suppress performance losses that occur due to non-homogenous distribution of electrolyte components. The method enhanced the photovoltaic performance of a segmented measurement cell by up to 42% compared to traditional one way filling of the electrolyte. The aforementioned results provide pathways for the future development of robust flexible counter electrodes that can be beneficial especially from the perspective of high throughput roll-to-roll processing of flexible DSCs on polymer substrates. en
dc.format.extent 54 + app. 66
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 41/2014
dc.relation.haspart [Publication 1]: Ghufran Hashmi, Kati Miettunen, Timo Peltola, Janne Halme, Imran Asghar, Kerttu Aitola, Minna Toivola, Peter Lund, Review of materials and manufacturing options for large area flexible dye solar cells, Renewable and Sustainable Energy Reviews 15 (2011) 3717– 3732.
dc.relation.haspart [Publication 2]: Ghufran Hashmi, Kati Miettunen, Janne Halme, Imran Asghar, Henri Vahlman, Tapio Saukkonen, Zhu Huaijin, Peter Lund, Comparison of plastic based counter electrodes for dye sensitized solar cells, Journal of the Electrochemical Society, 159 (7) H656-H661 (2012).
dc.relation.haspart [Publication 3]: Kati Miettunen, Minna Toivola, Ghufran Hashmi, Jyri Salpakari, Imran Asghar, Peter Lund, A carbon gel catalysts layer for the roll to roll production of dye solar cells, Carbon, 49, 528-532, (2011).
dc.relation.haspart [Publication 4]: Syed Ghufran Hashmi, Janne Halme, Tapio Saukkonen, Eeva-Leena Rautama, Peter Lund, High performance low temperature carbon composite catalysts for flexible dye sensitized solar cells, Physical Chemistry Chemical Physics, 15, (2013) 17689-17695,
dc.relation.haspart [Publication 5]: Syed Ghufran Hashmi, Janne Halme, Tapio Saukkanen, Peter Lund, A Single-Walled Carbon Nanotube Coated Flexible PVC Counter Electrode for Dye-Sensitized Solar Cells (Accepted for publication in Advanced Materials Interfaces). DOI: 10.1002/admi.201300055
dc.relation.haspart [Publication 6]: Syed Ghufran Hashmi, Kati Miettunen, Antti Ruuskanen, Imran Asghar, Janne Halme and Peter Lund, Process steps towards a flexible dye solar cell module, Proceedings of the 27th European Photovoltaic Solar Energy Conference 27, pp. 2922-2924 (2012).
dc.subject.other Electrical engineering en
dc.subject.other Energy en
dc.title Towards metal free counter electrodes for dye-sensitized solar cells en
dc.type G5 Artikkeliväitöskirja fi Perustieteiden korkeakoulu fi School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword dye-sensitized solar cell en
dc.subject.keyword flexible substrate en
dc.subject.keyword ITO-PET en
dc.subject.keyword ITO-PEN en
dc.subject.keyword counter electrode en
dc.subject.keyword carbon composite en
dc.subject.keyword carbon nanotubes en
dc.identifier.urn URN:ISBN:978-952-60-5626-5
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Lund, Peter, Prof. Aalto University, Department of Applied Physics, Finland
dc.opn Ma,Tingli, Prof., Kyushu Institute of Technology, Japan
dc.contributor.lab New Energy Technologies Group (NEW) en
dc.rev Korppi-Tommola, Jouko, Prof., University of Jyväskylä, Finland
dc.rev Lemmetyinen, Helge, Prof., Tampere University of Technology, Finland 2014-05-16

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