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The Effect of Illumination Direction and Temperature on Dye-Sensitized Solar Cells with Viscous Cobalt Complex-Based Electrolytes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.ORCID iD: 0000-0002-8249-1469
2018 (English)In: Inorganics, ISSN 2304-6740, Vol. 6, no 2, article id 60Article in journal (Refereed) Published
Abstract [en]

The illumination direction and temperature can greatly affect the performance of dye-sensitized solar cells (DSSCs) when practical non-volatile solvents are used with bulky one-electron redox mediators such as cobalt tris(bipyridine). For higher performance, a tandem electrolyte system consisting of cobalt tris(bipyridine) with tris(4-methoxyphenyl)amine was used. Discrepancies in J-V hysteresis were investigated by using photocurrent turn-on transients, open-circuit voltage decay, and electrochemical impedance spectroscopy. The devices perform much better upon illumination form the counter electrode side and exhibit much less hysteresis and more stabilized power output as characterized by maximum power-point tracking (MPP) tracking.

Place, publisher, year, edition, pages
2018. Vol. 6, no 2, article id 60
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-357402DOI: 10.3390/inorganics6020060ISI: 000436555000025OAI: oai:DiVA.org:uu-357402DiVA, id: diva2:1239214
Funder
Swedish Research Council, 621-2012-4721Swedish Foundation for Strategic Research , RMA15-0130StandUpAvailable from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-09-17Bibliographically approved
In thesis
1. Overcoming the Mass Transport Limitations of Dye-Sensitised Solar Cells: Towards highly efficient and robust alternative redox mediator electrolyte DSSCs
Open this publication in new window or tab >>Overcoming the Mass Transport Limitations of Dye-Sensitised Solar Cells: Towards highly efficient and robust alternative redox mediator electrolyte DSSCs
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dye-sensitised solar cells (DSSCs) have been subject to decadelong research interest, and may have some potential niche market applications. Recently, major advances in power conversion efficiencies have been achieved following the transition to cobalt polypyridine based redox mediators. Unfortunately, these champion devices remained unfeasible for commercialisation due to heavy reliance on flammable volatile acetonitrile electrolytes. Overcoming this issue has been a challenge due to increased mass transport limitations, which are especially exacerbated in more stable albeit viscous electrolytes. The overall aim of this thesis is to better understand the contributing factors to mass transport, and then to develop practical solutions to overcome these limitations. In particular, specific mass transport limitations pertaining to the bulk electrolyte medium and electrolyte-infiltrated TiO2 medium, are investigated. The effect of non-uniform photogeneration profile across the photoanode is explored with respect to mass transport using photocurrent transient techniques. Practical devices engineering for optimal mass transport is explored in terms of minimising the inter-electrode spacing and maximising light absorption towards the electrolyte-electrode side. Alternative devices based on more practical electrolytes with higher viscosity are optimised for high efficiency.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 65
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1705
Keywords
Dye-sensitised solar cell, dye-sensitized solar cell, photoelectrochemical cell, cobalt tris(bipyridine), mass transport, photocurrent transients
National Category
Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-357399 (URN)978-91-513-0408-3 (ISBN)
Public defence
2018-10-05, Room 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2018-09-11 Created: 2018-08-16 Last updated: 2018-10-02

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