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

Sang Youn Chae, Yun Jeong Hwang, Jong-Ho Choi, Oh Shim Joo

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Recently, a cobalt complex based electrolyte such as [Co(bpy) 3]2+/3+ was suggested to replace the conventional I 3 -/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 = 7.228 mA/cm2, which is 13% higher than that with Pt (Jsc = 6.443 mA/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.

Original languageEnglish
Pages (from-to)745-749
Number of pages5
JournalElectrochimica Acta
Volume114
DOIs
Publication statusPublished - 2013 Nov 20

Fingerprint

Cobalt
Electrolytes
Conversion efficiency
Thin films
Electrodes
Electrochemical impedance spectroscopy
Adsorption
Networks (circuits)
Dye-sensitized solar cells
cobaltous sulfide
Sulfides
tris(2,2'-bipyridyl)cobalt(II)
tris(2,2'-bipyridyl)cobalt(III)

Keywords

  • Cobalt complex electrolyte
  • Cobalt sulfide
  • Counter electrode
  • Dye-sensitized solar cells
  • Electrochemical impedance spectroscopy

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Cobalt sulfide thin films for counter electrodes of dye-sensitized solar cells with cobalt complex based electrolytes. / Chae, Sang Youn; Hwang, Yun Jeong; Choi, Jong-Ho; Joo, Oh Shim.

In: Electrochimica Acta, Vol. 114, 20.11.2013, p. 745-749.

Research output: Contribution to journalArticle

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AU - Chae, Sang Youn

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AU - Joo, Oh Shim

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AB - Recently, a cobalt complex based electrolyte such as [Co(bpy) 3]2+/3+ was suggested to replace the conventional I 3 -/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 = 7.228 mA/cm2, which is 13% higher than that with Pt (Jsc = 6.443 mA/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.

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