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Electrochemical properties and trap states of TiO2 nanoparticles modified by doping with graphene and used as counter electrodes for dye-sensitized solar cell applications

  • Yow-Jon LinEmail author
  • Chang-Lin Wu
  • Hsing-Cheng Chang
Original Paper
  • 17 Downloads

Abstract

The electrochemical properties and trap states of TiO2 nanoparticles that are modified by doping with graphene (Gr) and used as counter electrodes (CEs) for dye-sensitized solar cell (DSSC) applications are studied. This research demonstrates the operation of a DSSC that features a TiO2 CE, with or without the addition of Gr. TiO2 nanoparticles are used as the CE for a DSSC to determine their specific properties and to determine the effect of trap states in TiO2 on the photovoltaic performance. The photovoltaic performance for DSSCs is affected by the addition of Gr. In a CE that uses TiO2, the long-lifetime and short-lifetime carrier traps render the charge transfer behavior more complex. The existence of trap states induces photovoltaic instability. The incorporation of Gr leads to an increase in the power conversion efficiency and the photovoltaic stability for a DSSC, because of the change in the over-potential at the TiO2 CE/electrolyte interface and the dominance of the long-lifetime hole detrapping that is related to the formation of the Gr percolation paths in a TiO2 CE that is doped with Gr.

Keywords

Dye-sensitized solar cell Titanium dioxide Graphene Defects Counter electrode Electrocatalytic activity 

PACS Nos.

68.35.−p 68.35.Dv 68.65.−k 68.65.Pq 71.20.Ps 72.20.Jv 72.40.+w 

Notes

Acknowledgements

The authors acknowledge the support of the Ministry of Science and Technology, Taiwan (Contract No. 106-2112-M-018-001-MY3), in the form of grants.

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Copyright information

© Indian Association for the Cultivation of Science 2019

Authors and Affiliations

  1. 1.Institute of PhotonicsNational Changhua University of EducationChanghuaTaiwan
  2. 2.Department of Automatic Control EngineeringFeng Chia UniversityTaichungTaiwan

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