Improvement of Charge Transfer Efficiency of Dye-sensitized Solar Cells by Blocking Layer Coatings

차단막 코팅에 의한 염료 태양전지의 전하전송효율 개선에 관한 연구

  • Received : 20101100
  • Accepted : 20101200
  • Published : 2011.02.01


A layer of $TiO_2$ thin film less than ~200nm in thickness, as a blocking layer, was deposited by 13.56 MHz radio frequency magnetron sputtering method directly onto the anode electrode to be isolated from the electrolyte in dye-sensitized solar cells (DSCs). This is to prevent the electrons from back-transferring from the electrode to the electrolyte ($I^-/{I_3}^-$). The presented DSCs were fabricated with working electrode of F:$SnO_2$(FTO) glass coated with blocking $TiO_2$ layer, dye-attached nanoporous $TiO_2$ layer, gel electrolyte and counter electrode of Pt-deposited FTO glass. The effects of blocking layer were studied with respect to impedance and conversion efficiency of the cells. The, electrochemical impedances of DSCs using this electrode were $R_1$: 13.9, $R_2$: 15.0, $R_3$: 10.9 and $R_h$: $82{\Omega}$. The $R_2$ impedance related by electron movement from nanoporous $TiO_2$ to TCO showed lower than that of normal DSCs. The photo-conversion efficiency of prepared DSCs was 5.97% ($V_{oc}$: 0.75V, $J_{sc}$: 10.5 mA/$cm^2$, ff: 0.75) and approximately 1% higher than general DSCs sample.


Supported by : 한국연구재단


  1. Mats Leijon et al., "On the physics of power, energy and economics of renewable electric energy sources-Part I," Renewable Energy, Vol. 35, pp.1729-1734, 2010.
  2. Claes G. Granqvist, "Transparent conductors as solar energy materials: A panoramic review," Solar Energy Materials and Solar Cells, Vol. 91, pp.1529-1598, 2007.
  3. Peter Wurfel, Physics of solar cell: From Principles to New Concepts, Willy-VCH, 2005.
  4. B. O'Regan, M. Gratzel, "A low cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films", Nature, Vol.353, pp.737-740, 1991
  5. M. Gratzel, "Photoelectrochemical cells", Nature, Vol.414, pp.338-344, 2001.
  6. Y. M. Sung, K. Y. Chun, D. J. Kwak, M. W. Park, "Fabrication and Characterization of Dye-Sensitized Solar Cell Using TiO2-Nanotube Particles by Anodic Oxidation", Japanese Journal of Applied Physics, Vol.48, No.8, pp.1110-1113, 2009
  7. J. H. Heo, K. Y. Jung, D. J. Kwak, D. K. Lee, and Y. M. Sung, "Fabrication of Titanium-Doped Indium Oxide Films for Dye-Sensitized Solar Cells Application Using Reactive RF Magnetron Sputter Method, IEEE Trans. Plasma Sci., Vol. 37, No. 8, pp. 1586-1592, 2009.
  8. H. M. Kwon, D. W. Han, D. J. Kwak, Y. M. Sung, Preparation of nanoporous F-doped tin dioxide films for TCO-less dye-sensitized solar cells application", Current Applied Physics, Vol.10, No.2, pp. S172-S175, 2010
  9. 한치환, 성열문, "졸겔 연소법을 이용한 염료감응 태양 전지용 나노 다공질 구조 TiO2 제작", 전기학회논문지, 58권, pp.327-331, 2009
  10. D. H. Kim, J. H. Heo, D. J. Kwak, Y. M. Sung, "Synthesis of TCO-free Dye-sensitized Solar Cells with Nanoporous Ti Electrodes Using RF Magnetron Sputtering Technology", Journal of Electrical Engineering & Technology, Vol.5, No.1, pp.146-150, 2010.
  11. E. Kuantama, D. W. Han, Y. M. Sung, J. E. Song, C. H. Han, "Structure and thermal properties of transparent conductive nanoporous F:SnO2 films", Thin Solid Films, Vol.517, pp.4211-4214, 2009.
  12. Judy N. Hart et al., "TiO2 sol?gel blocking layers for dye-sensitized solar cells", Comptes Rendus Chimie, Vol. 9, pp.622-626, 2006.
  13. Petra J. Cameron and Laurence M. Peter, "Characterization of Titanium Dioxide Blocking Layers in Dye-Sensitized Nanocrystalline Solar Cells", J. Phys. Chem. B, Vol. 107, pp.14394-14400, 2003.