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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 ,
Horim Lee ,
Dong Young Kim ,
Sehyun Kim  and
Yongsok Seo
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.

Keywords

flexibleenergy generationphotovoltaic
Type
Articles
Information
MRS Advances , Volume 4 , Issue 8: Thermal Properties and Thermoelectric Materials , 2019 , pp. 481 - 489
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

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These authors contributed equally.

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