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Characteristics of dye-sensitized solar cells with surface-modified multi-walled carbon nanotubes as counter electrodes

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Abstract

A polystyrene-based functional block copolymer is employed as a surface modifier for multi-walled carbon nanotube (MWCNT) paste utilized in the fabrication of a MWCNT counter electrode (CE) in dye-sensitized solar cells (DSSCs). The surface modification of MWCNTs paste improves the dispersibility of MWCNTs, resulting in a facilitated fabrication of electrodes through the screen printing procedure, as evidenced by a lower viscosity and more homogeneous paste, as well as a more uniform MWCNT coating. Upon removing organic compounds from the paste through a thermal treatment procedure, the DSSC with the modified CE exhibits enhanced solar energy conversion efficiency (η) compared with that of the neat MWCNT CE. The behavior stems from an improvement in the overall redox reaction kinetics and the short-circuit current (J sc) of the DSSC. The DSSC also exhibits an improved η value over an extended storage period, which demonstrates a successful combination of processability, performance, and stability of the DSSC achieved by using an optimum amount of surface modifier for MWCNTs.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2012005345). This research was also supported by the Nuclear R&D program of the Korean Science and Engineering Foundation and the Ministry of Education, Science and Technology.

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Authors and Affiliations

  1. Department of Nano Science and Technology, Sejong University, Seoul, 143-747, Republic of Korea

    Hee Jung Choi, Hee Hyun Gong & Sung Chul Hong

  2. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, 143-747, Republic of Korea

    Jun-Young Park

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  1. Hee Jung Choi
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  2. Hee Hyun Gong
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  3. Jun-Young Park
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  4. Sung Chul Hong
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Correspondence to Sung Chul Hong.

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Choi, H.J., Gong, H.H., Park, JY. et al. Characteristics of dye-sensitized solar cells with surface-modified multi-walled carbon nanotubes as counter electrodes. J Mater Sci 48, 906–912 (2013). https://doi.org/10.1007/s10853-012-6813-4

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  • DOI: https://doi.org/10.1007/s10853-012-6813-4

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