Electrochemical properties and trap states of TiO 2 nanoparticles modified by doping with graphene and used as counter electrodes for dye-sensitized solar cell applications

Yow-Jon Lin, Chang Lin Wu, Hsing Cheng Chang

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Abstract

The electrochemical properties and trap states of TiO 2 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 TiO 2 CE, with or without the addition of Gr. TiO 2 nanoparticles are used as the CE for a DSSC to determine their specific properties and to determine the effect of trap states in TiO 2 on the photovoltaic performance. The photovoltaic performance for DSSCs is affected by the addition of Gr. In a CE that uses TiO 2 , 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 TiO 2 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 TiO 2 CE that is doped with Gr.

Original languageEnglish
JournalIndian Journal of Physics
DOIs
Publication statusPublished - 2019 Jan 1

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graphene
counters
solar cells
dyes
traps
nanoparticles
electrodes
life (durability)
charge transfer
electrolytes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Electrochemical properties and trap states of TiO 2 nanoparticles modified by doping with graphene and used as counter electrodes for dye-sensitized solar cell applications",
abstract = "The electrochemical properties and trap states of TiO 2 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 TiO 2 CE, with or without the addition of Gr. TiO 2 nanoparticles are used as the CE for a DSSC to determine their specific properties and to determine the effect of trap states in TiO 2 on the photovoltaic performance. The photovoltaic performance for DSSCs is affected by the addition of Gr. In a CE that uses TiO 2 , 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 TiO 2 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 TiO 2 CE that is doped with Gr.",
author = "Yow-Jon Lin and Wu, {Chang Lin} and Chang, {Hsing Cheng}",
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AU - Chang, Hsing Cheng

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N2 - The electrochemical properties and trap states of TiO 2 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 TiO 2 CE, with or without the addition of Gr. TiO 2 nanoparticles are used as the CE for a DSSC to determine their specific properties and to determine the effect of trap states in TiO 2 on the photovoltaic performance. The photovoltaic performance for DSSCs is affected by the addition of Gr. In a CE that uses TiO 2 , 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 TiO 2 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 TiO 2 CE that is doped with Gr.

AB - The electrochemical properties and trap states of TiO 2 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 TiO 2 CE, with or without the addition of Gr. TiO 2 nanoparticles are used as the CE for a DSSC to determine their specific properties and to determine the effect of trap states in TiO 2 on the photovoltaic performance. The photovoltaic performance for DSSCs is affected by the addition of Gr. In a CE that uses TiO 2 , 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 TiO 2 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 TiO 2 CE that is doped with Gr.

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