Performance improvement of dye-sensitized solar cell by introducing Sm3 +/Y3 + co-doped TiO2 film as an efficient blocking layer

Yiying Qin, Zhiqiang Hu, Boon Han Lim, Bin Yang, Kok Keong Chong, Wei Sea Chang, Putao Zhang, Haitao Zhang

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Luminescence mediums: samarium ion and yttrium ion, were introduced to expand the photo-response region of TiO2 by means of the down-conversion effect to convert ultraviolet light into visible light, offering a unique method to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). Their crystal structures, optical properties as well as photovoltaic performance were investigated systematically. The result indicates that the DSSCs doped with a total molar ratio of 4 mol% of Sm3 + and Y3 + show an overall power conversion efficiency of 4.09%, which is equivalent to improvements of 17.52% and 16.2% as compared to the no blocking layer DSSCs and pure TiO2 blocking layer DSSCs respectively. The improvement in conversion efficiency is attributed to the dual effects including down-conversion of ultraviolet light and reduction of electron-hole recombination rate.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalThin Solid Films
Publication statusPublished - 1 Jun 2017


  • Blocking layer
  • Co-doped TiO
  • Down-conversion
  • Dye-sensitized solar cell
  • Recombination rate
  • Samarium
  • Sm/Y:TiO
  • Yttrium

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