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Effect of TiO2-based Nanocomposite Scattering Layer on Photovoltaic Characteristics of Dye Sensitized Solar Cell

Asgari Moghaddam, Hatameh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47960 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Seyyed Reihani, Morteza; Mohammadi, Mohammad Reza
  7. Abstract:
  8. Many efforts have been put into increasing the efficiency of dye-sensitized solar cells that part of it has been devoted to structure and chemical composition of photoanode electrode. In this thesis, the effect of changes in the composition and its influence on light scattering ability in photoanode of dye sensitized solar cells was studied.First, the nanoparticles of titanium dioxide powder through solvothermal method as well as spherical particle and barium titanate powder by sol-gel method were synthesized. XRD and FE-SEM analyses indicated that synthesized powders are in good size and morphology regarding the intended chemical composition. Optical properties of TiO2 particles were studied by absorbing UV-Vis and analysis of DRS. The results show that spherical particles of titanium dioxide and cubic barium titanate particles, due to their larger size and morphology, have higher diffusion reflectance comparing to nanoparticles of titanium dioxide and are suitable while used as a scattering layer. Consequently, the paste with optimized formulation containing nanoparticles was prepared and in different thicknesses it will be coated on FTO to achieve optimum thickness the coating. The optimum thickness was reported to be about14 μm and other cells were made with the optimum thickness. The combination effect of the active layer in dye sensitized solar cells was examined by adding 5-25% barium titanate to nanoparticles of titanium dioxide. Barium titanate cubes is used in this layer as light scattering center. At the end, the combination of cubic particles of barium titanate with spherical particles of titanium dioxide as a scattering layer are coated on the active layer. In both ways, the efficiency of solar cells has shown a significant increase. The mirror face of cubic particles of barium titanate leads to scattering and reflection of incident light as well as increasing the light harvest in cells. The mentioned processes cause the increase of the current density and thus improve the performance of dye sensitized solar cells. Finally, the best arrangement and structure efficiency of 8/8% was achieved which increased 22% than the single-layer coating containing nanoparticles
  9. Keywords:
  10. Dye Sensitized Solar Cells ; Photoanode Electrode ; Titanium Dioxide ; Barium Titanat ; Scattering Layer

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