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Thermal Stability Study of Dye-Sensitized Solar Cells with Cobalt Bipyridyl-based Electrolytes
Uppsala universitet, Fysikalisk kemi.
Uppsala universitet, Fysikalisk kemi.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Uppsala universitet, Fysikalisk kemi.
Uppsala universitet, Fysikalisk kemi.
Number of Authors: 4
2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 213, 879-886 p.Article in journal (Refereed) Published
Abstract [en]

Dye-sensitized solar cells (DSSCs) with cobalt bipyridyl-based electrolytes can display higher solar cell performance than their iodide/triiodide counterpart. There is, however, little knowledge on their long term stability, which is a crucial aspect for potential commercial application. Herein, we studied the thermal stability of DSSCs using Co(bpy)(3)(2+/3+) redox electrolyte at 70 degrees C in the dark for 50 days, combining 3 different additives, 4-tert-butylpyridine (TBP), 1-methylimidazole (MBI) and 2,2'-bipyridyl (BPY), in a nonvolatile solvent 3-methoxypropionitrile (MPN). Significant voltage decreases were found for all the studied solar cells, with a mechanism involving both a positive shift of the conduction band edge potential of TiO2 and a decreased electron lifetime, characterized by time resolved transient modulation techniques. Furthermore electrochemical impedance spectroscopy and differential pulse voltammetry studies indicate that the stability of Co(bpy)(3)(3+) is limited, causing an increased diffusion resistance in the electrolyte, but, surprisingly, no substantial change of the short-circuit current density (Jsc) in the devices. Overall, the DSSCs fabricated with the addition of both MBI and BPY in the electrolyte show the highest stability, maintaining 96% of its initial efficiency after 50 days, resulting from the overall compensation effects between the open circuit voltage decrease and the Jsc increase. These results provide insights about the degradation mechanism and emphasize the importance of the stability of TiO2/dye/electrolyte interface for the device stability under thermal stress.

Place, publisher, year, edition, pages
2016. Vol. 213, 879-886 p.
Keyword [en]
Thermal stability, Dye sensitized solar cells, Cobalt electrolyte, Lewis base
National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
URN: urn:nbn:se:ltu:diva-59544DOI: 10.1016/j.electacta.2016.07.112ISI: 000382251900105OAI: oai:DiVA.org:ltu-59544DiVA: diva2:1033219
Conference
13th International Fischer Symposium, JUN 07-11, 2015, Lubeck, GERMANY
Note

Validerad; 2016; Nivå 1; 2016-10-06 (andbra); Konferensartikel i tidskrift

Available from: 2016-10-03 Created: 2016-10-06 Last updated: 2017-10-19Bibliographically approved

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