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Cobalt-Based Electrolytes for Efficient Flexible Dye-Sensitized Solar Cells

Published online by Cambridge University Press:  19 February 2019

Jihun Kim
Affiliation:
RIAM, Department of Material Science and Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul, Korea 08826
Horim Lee
Affiliation:
RIAM, Department of Material Science and Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul, Korea 08826 Polymer Hybrid Research Center, Korea Institute of Science and Technology, P.O. BOX131, Cheongryang, Seoul, Korea 02792
Dong Young Kim
Affiliation:
Polymer Hybrid Research Center, Korea Institute of Science and Technology, P.O. BOX131, Cheongryang, Seoul, Korea 02792
Sehyun Kim
Affiliation:
LG Chem., Moonjiro 188, Yousungku, Daejon, Korea34122
Yongsok Seo*
Affiliation:
RIAM, Department of Material Science and Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul, Korea 08826
*
*(Email: ysseo@snu.ac.kr)
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Abstract

We have developed new flexible dye-sensitized solar cells (DSSCs) comprising organic dye (JH-1), cobalt redox electrolyte and hierarchically structured TiO2 (HS-TiO2) photoelectrode prepared using an electrostatic spray method. The performance of JH-1 sensitized flexible DSSC with a cobalt redox electrolyte was compared with those of N719-based DSSC and DSSC with I-/ I3- redox electrolyte. As a result, JH-1 sensitized flexible DSSC with [Co(Ⅲ/Ⅱ)(bpy-pz)3](PF6)3/2 redox system exhibited a high photocurrent density of 9.17 mA cm-2, an open circuit voltage of 0.953 V, a fill factor of 0.70, and a power conversion efficiency of 6.12% under 1 sun illumination (100 mW cm-2). The incident photon-to-current conversion efficiency was measured to explain the photocurrent generation difference by different dyes and electrolytes. The electron recombination lifetime of cells was measured by intensity-modulated photovoltage spectroscopy. Mass transport in DSSCs employing cobalt redox electrolytes was also investigated by the photocurrent transient measurements and electrochemical impedance spectroscopy (EIS) analysis.

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Articles
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

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These authors contributed equally.

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