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28.07.2011

High-Efficiency, Solid-State, Dye-Sensitized Solar Cells Using Hierarchically Structured TiO2 Nanofibers





Daesub Hwang, Seong Mu Jo, Dong Young Kim, Vanessa Armel, Douglas R. MacFarlane, and Sung-Yeon Jang*


Polymer Hybrids Center, Korea Institute of Science and Technology, Seoul, Korea

Australian Centre for Electromaterials Science, School of Chemistry, Monash University, Clayton, VIC 3800, Australia


ACS Appl. Mater. Interfaces, 2011, 3 (5), pp 1521–1527

DOI: 10.1021/am200092j

Publication Date (Web): March 31, 2011

Copyright © 2011 American Chemical Society

*E-mail: syjang@kookmin.ac.kr. Tel: +82- 2- 910- 5768. Fax: +82- 2- 910- 4415.



§ Author Present Address


Department of Chemistry, Kookmin University, Seoul, Korea.





Abstract



Abstract Image

High-performance, room-temperature (RT), solid-state dye-sensitized solar cells (DSSCs) were fabricated using hierarchically structured TiO2 nanofiber (HS-NF) electrodes and plastic crystal (PC)-based solid-state electrolytes. The electrospun HS-NF photoelectrodes possessed a unique morphology in which submicrometer-scale core fibers are interconnected and the nanorods are dendrited onto the fibers. This nanorod-in-nanofiber morphology yielded porosity at both the mesopore and macropore level. The macropores, steming from the interfiber space, afforded high pore volumes to facilitate the infiltration of the PC electrolytes, whereas the mesoporous nanorod dendrites offered high surface area for enhanced dye loading. The solid-state DSSCs using HS-NFs (DSSC-NF) demonstrated improved power conversion efficiency (PCE) compared to conventional TiO2 nanoparticle (NP) based DSSCs (DSSC-NP). The improved performance (>2-fold) of the DSSC-NFs was due to the reduced internal series resistance (Rs) and the enhanced charge recombination lifetime (τr) determined by electrochemical impedance spectroscopy and intensity modulated photocurrent/photovoltage spectroscopy. The easy penetration of the PC electrolytes into HS-NF layers via the macropores reduces Rs significantly, improving the fill factor (FF) of the resulting DSSC-NFs. The τr difference between the DSSC-NF and DSSC-NP in the PC electrolytes was extraordinary ( 14 times) compared to reported results in conventional organic liquid electrolytes. The optimized PCE of DSSC-NF using the PC electrolytes was 6.54, 7.69, and 7.93% at the light intensity of 100, 50, and 30 mW cm−2, respectively, with increased charge collection efficiency (>40%). This is the best performing RT solid-state DSSC using a PC electrolyte. Considering the fact that most reported quasi-solid state or nonvolatile electrolytes require higher iodine contents for efficient ion transport, our HS-NFs are a promising morphology for such electrolytes that have limited ion mass transport.




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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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