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

doi:10.1016/j.electacta.2013.10.038

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

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

18 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 J_sc = 7.228 mA/cm², which is 13% higher than that with Pt (J_sc = 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 language	English
Pages (from-to)	745-749
Number of pages	5
Journal	Electrochimica Acta
Volume	114
DOIs	https://doi.org/10.1016/j.electacta.2013.10.038
Publication status	Published - 2013

Keywords

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

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2013.10.038

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@article{20c03e69649d4734a0d8c96b76bb1d2b,

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

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.",

keywords = "Cobalt complex electrolyte, Cobalt sulfide, Counter electrode, Dye-sensitized solar cells, Electrochemical impedance spectroscopy",

author = "Chae, {Sang Youn} and Hwang, {Yun Jeong} and Choi, {Jong Ho} and Joo, {Oh Shim}",

note = "Funding Information: This research was supported by the Korea Institute of Science and Technology (KIST) institutional program.",

year = "2013",

doi = "10.1016/j.electacta.2013.10.038",

language = "English",

volume = "114",

pages = "745--749",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Cobalt sulfide thin films for counter electrodes of dye-sensitized solar cells with cobalt complex based electrolytes

AU - Chae, Sang Youn

AU - Hwang, Yun Jeong

AU - Choi, Jong Ho

AU - Joo, Oh Shim

N1 - Funding Information: This research was supported by the Korea Institute of Science and Technology (KIST) institutional program.

PY - 2013

Y1 - 2013

N2 - 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.

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.

KW - Cobalt complex electrolyte

KW - Cobalt sulfide

KW - Counter electrode

KW - Dye-sensitized solar cells

KW - Electrochemical impedance spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=84887576989&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2013.10.038

DO - 10.1016/j.electacta.2013.10.038

M3 - Article

AN - SCOPUS:84887576989

SN - 0013-4686

VL - 114

SP - 745

EP - 749

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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