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Performance of NiTiO3 for Light Harvesting and Electron-Hole Separation of TiO2-Based Dye-Sensitized Solar Cells

Seyed Abolghasem, Helia Sadat | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57499 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza
  7. Abstract:
  8. Dye sensitized solar cells are one of the cheap and available technologies that have attracted the attention of many researchers. Many factors such as morphology, microstructure, phase composition and the arrangement of photoanode electrode layers have an effect on the photovoltaic properties of DSSCs. Different approaches have been used to improve the efficiency of this type of cells. Among these approaches, we can mention the use of a mixture of different phases of titanium dioxide and the use of perovskite titanate structures as photoanodes. In the current study, the performance of nickel titanate on light absorption and electron-hole separation in titanium dioxide-based dye-sensitized solar cell was investigated. According to the titanium dioxide band structure, this material only absorbs light in the ultraviolet region. Adding materials such as nickel titanate, which has a narrower band gap than titanium dioxide, increases the range of the absorption spectrum. Titanium dioxide nanoparticles and nickel titanate/titanium dioxide nanocomposite were synthesized by combinatiom of solvothermal and sol-gel methods, respectively. Various compositions of titanium dioxide nanoparticles with anatase and rutile phases along with nickel titanate were investigated. These compounds include nickel titanate, nickel titanate/anatase, nickel titanate/rutile and nickel titanate/anatase/rutile. In this research, first, the appropriate thickness for the pure anatase cell was obtained at 22 micrometers, and the thickness of other cells was fixed at 22 micrometers, and the effect of the phase composition of the samples on the efficiency were investigated. Single-layer and double-layer samples were prepared with the mentioned compounds and their photovoltaic performance was evaluated. According to the results of J-V curves, cell with double-layer photoanode, which includes the active layer of anatase and the top layer, which includes the phase mixture of anatase, rutile, and nickel titanate, showed the highest efficiency compared to the pure anatase cell, so that The efficiency of this cell increased from 6.75% to 9.46% compared to pure anatase
  9. Keywords:
  10. Dye Sensitized Solar Cells ; Nickel Titanate ; Nanocomposite Based on Titanium Dioxide ; Electron-Hole Separation ; Dioxide Titanium Dye-Sensitized Solar Cell

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