Cobalt-Based Electrolytes for Efficient Flexible Dye-Sensitized Solar Cells
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.126
Cobalt-Based Electrolytes for Efficient Flexible Dye-Sensitized Solar Cells Jihun Kim1+, Horim Lee1,2+, Dong Young Kim2, Sehyun Kim3, Yongsok Seo1* 1
RIAM, Department of Material Science and Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul, Korea 08826
2
Polymer Hybrid Research Center, Korea Institute of Science and Technology, P.O. BOX 131, Cheongryang, Seoul, Korea 02792
3
LG Chem., Moonjiro 188, Yousungku, Daejon, Korea 34122
+
These authors contributed equally.
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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INTRODUCTION Since flexible dye-sensitized solar cells (DSSCs) can be used in a wide range of commercial applications for the mobile and wearable electronics industries due to their flexibility, light weight and roll-to-roll processibility, they have attracted a lot of attention in recent years.[1~5] Despite their advantages and growth potential, flexible DSSCs have made relatively little progress over last few years compared to traditional rigid DSSCs. Flexible DSSCs have some issues to be solved such as (1) fabrication of TiO2 films on plastic substrates for the working electrode through a low temperature process and (2) poor device stability due to penetration of oxygen and moisture. The main challenge in fabricating flexible DSSCs is to reduce the processing temperature since plastic substrates for working electrodes limit the thermal process to about 150℃ which results in poor interparticle connectivity between the TiO2 particles and decreased adhesion of the TiO2 film with the substrate, resulting in lower cell efficiency compared to conventional rigid DSSCs.[5] Several methods have been developed
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