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Eu-doped LGF Luminescent Down Converter Possible for TiO2 Dye Sensitized Solar Cells

  • Kim, Hyun-Ju (Electric & Magnetic Devices Research Group, Korea Electrotechnology Research Institute) ;
  • Song, Jae-Sung (Electric & Magnetic Devices Research Group, Korea Electrotechnology Research Institute) ;
  • Lee, Dong-Yun (Electric & Magnetic Devices Research Group, Korea Electrotechnology Research Institute) ;
  • Lee, Won-Jae (Electric & Magnetic Devices Research Group, Korea Electrotechnology Research Institute)
  • Published : 2004.06.01

Abstract

For improving solar efficiencies, down conversion of high-energy photons to visible lights is discussed. The losses due to thermalization of charge carriers generated by the absorption of high-energy photons, can largely be reduced in a solar cell if more than one electron-hole pair can be generated per incident photon. The solar cell was constructed of dye-sensitized anatase-based TiO$_2$, approximately 30nm particle size, 6$\mu\textrm{m}$thickness, and 6${\times}$6$\textrm{mm}^2$ active area, Pt counter electrode and I$_3$$\^$-/I$_2$$\^$-/ electrolyte. After correction for losses due to light reflection and absorption by the conducting glass, the conversion of photons to electric current is practically quantitative in the plateau region of the curves. The incident photon to current conversion efficiency(IPCE) of N3 used as a dye in this work is about 80% at around 590nm and 610nm which is the emission spectrum of Eu doped LGF. The Eu doped LGF powder was prepared by conventional ceramic process, and used as a down converter for DSC after spin coated on the slide glass and fired.

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References

  1. T. Trupke, M. A. Green, and P. Wurfel, 'Improving solar cell efficiencies by down-conversion of highenergy photons', J. Appl. Phys., Vol. 92, p. 1668, 2002 https://doi.org/10.1063/1.1492021
  2. C. Feldmann, T. Justel, C. R. Ronda, and D. U. Wiechert, 'Quantum efficiency of down-conversion phosphor LiGdF4:Eu', J. Lumin., Vol. 92, p. 245,2001 https://doi.org/10.1016/S0022-2313(00)00240-4
  3. A. Luque and A. Marti, 'Increasing the efficiency of ideal solar cells by photon induced transitions at intermediate levels', Phys. Rev. Lett., Vol. 78, p.5014,1997 https://doi.org/10.1103/PhysRevLett.78.5014
  4. T. Maruyama and R. Kitamura, 'Transformations of Wavelength of the Light Incident upon Solar Cells', Sol. Energy Mater. Sol. Cells, Vol. 69, p. 207, 2001 https://doi.org/10.1016/S0927-0248(00)00390-1
  5. S. J. Kim and S. Park, 'Effects of negative ions in aqueous Ti solution on formation of ultrafine $TiO^2$ powder by low temperature homogeneous precipitation', Jpn. J. Appl. Phys., Vol. 40, p. 6797, 2001. https://doi.org/10.1143/JJAP.40.6797
  6. S. J. Kim, S. D. Park, Y. H. Jeong, and S. Park, 'Homogeneous precipitation of $TiO^2$ ultrafine powders from aqueous TiOC12 solution', J. Am. Ceram. Soc., Vol. 82, p. 927, 1999 https://doi.org/10.1111/j.1151-2916.1999.tb01855.x
  7. A. Hagfeldt and M. Gratzel, 'Molecular photovoltaics', Acc. Chem. Res., Vol. 33, p. 269, 2000 https://doi.org/10.1021/ar980112j