Cobalt sulfide thin films for counter electrodes of dye-sensitized solar cells with cobalt complex based electrolytes

Recently, a cobalt complex based electrolyte such as [Co(bpy)3]2+/3+ was suggested to replace the conventional I3−/I− system because of its potential to provide high open circuit potential and power conversion efficiency in dye-sensitized solar cells (DSSCs). Here, a cobalt sulfide thin film was syn...

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Bibliographic Details
Published in:Electrochimica acta 2013-12, Vol.114, p.745-749
Main Authors: Chae, Sang Youn, Hwang, Yun Jeong, Choi, Jong-Ho, Joo, Oh-Shim
Format: Article
Language:English
Subjects:
Cobalt
Cobalt complex electrolyte
Cobalt sulfide
Counter electrode
Dye-sensitized solar cells
Electrochemical impedance spectroscopy
Electrodes
Electrolytes
Energy conversion efficiency
Photovoltaic cells
Solar cells
Sulfides
Thin films
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Summary:Recently, a cobalt complex based electrolyte such as [Co(bpy)3]2+/3+ was suggested to replace the conventional I3−/I− system because of its potential to provide high open circuit potential and power conversion efficiency in dye-sensitized solar cells (DSSCs). Here, a cobalt sulfide thin film was synthesized by electrochemical deposition and used for a counter electrode. A DSSC with the cobalt sulfide counter electrode exhibits Jsc=7.228mA/cm2, which is 13% higher than that with Pt (Jsc=6.443mA/cm2), thereby achieving an enhanced power conversion efficiency. Electrochemical impedance spectroscopy measurements indicate that the reduced Warburg diffusion impedance and faster adsorption of [Co(bpy)3]3+ facilitate the reduction of the cobalt complex.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.10.038