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Tailor and functionalize TiO2 compact layer by acid treatment for high performance dye-sensitized solar cell and its enhancement mechanism

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  • Guai, Guan Hong
  • Song, Qun Liang
  • Lu, Zhi Song
  • Ng, Chee Mang
  • Li, Chang Ming

Abstract

Surface tailoring and functionalization of an annealed TiO2 compact layer by H2SO4 acid was performed to improve the dye-sensitized solar cell (DSSC) performance. Compared to untreated counterpart, the acid-treated compact layer possesses a rougher surface and more hydroxyl groups, which result in increased surface area and enhanced adherence of the compact layer with the mesoporous TiO2 film by Ti–O–Ti bonds formed by a followed heating process. Impedance measurement was further used to investigate the enhancement mechanism, indicating the acid post treatment of the TiO2 compact layer reduces the ohmic bulk resistivity while effectively suppressing charge recombination at FTO/electrolyte interface. In DSSCs with untreated TiO2 compact layer, a significantly increased series resistivity is very likely to be the rate determining factor to limit the charge separation process. Thus, an optimal post acid treatment could reduce the resistivity for high charge transport, resulting in larger short-circuit current for further improvement of power conversion efficiency from 6.60% in DSSC with untreated compact layer to 7.21% in DSSC with acid-treated compact layer. This work also provides fundamental insight of the compact layer for DSSC performance improvement.

Suggested Citation

  • Guai, Guan Hong & Song, Qun Liang & Lu, Zhi Song & Ng, Chee Mang & Li, Chang Ming, 2013. "Tailor and functionalize TiO2 compact layer by acid treatment for high performance dye-sensitized solar cell and its enhancement mechanism," Renewable Energy, Elsevier, vol. 51(C), pages 29-35.
    • Handle: RePEc:eee:renene:v:51:y:2013:i:c:p:29-35
    DOI: 10.1016/j.renene.2012.08.078
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    References listed on IDEAS

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    1. Roy, Debmalya & Shastri, Babita & Imamuddin, Md. & Mukhopadhyay, K. & Rao, K.U. Bhasker, 2011. "Nanostructured carbon and polymer materials – Synthesis and their application in energy conversion devices," Renewable Energy, Elsevier, vol. 36(3), pages 1014-1018.
    2. Kashyout, A.B. & Soliman, M. & Fathy, M., 2010. "Effect of preparation parameters on the properties of TiO2 nanoparticles for dye sensitized solar cells," Renewable Energy, Elsevier, vol. 35(12), pages 2914-2920.
    3. Dhungel, Suresh Kumar & Park, Jesse G., 2010. "Optimization of paste formulation for TiO2 nanoparticles with wide range of size distribution for its application in dye sensitized solar cells," Renewable Energy, Elsevier, vol. 35(12), pages 2776-2780.
    4. Kanmani, S.S. & Ramachandran, K., 2012. "Synthesis and characterization of TiO2/ZnO core/shell nanomaterials for solar cell applications," Renewable Energy, Elsevier, vol. 43(C), pages 149-156.
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    Cited by:

    1. Gong, Jiawei & Sumathy, K. & Qiao, Qiquan & Zhou, Zhengping, 2017. "Review on dye-sensitized solar cells (DSSCs): Advanced techniques and research trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 234-246.
    2. Sulaeman, Uyi & Zuhairi Abdullah, Ahmad, 2017. "The way forward for the modification of dye-sensitized solar cell towards better power conversion efficiency," Renewable and Sustainable Energy Reviews, Elsevier, vol. 74(C), pages 438-452.
    3. Shahzad, Nadia & Lutfullah, & Perveen, Tahira & Pugliese, Diego & Haq, Sirajul & Fatima, Nusrat & Salman, Syed Muhammad & Tagliaferro, Alberto & Shahzad, Muhammad Imran, 2022. "Counter electrode materials based on carbon nanotubes for dye-sensitized solar cells," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).

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