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Synthesis of SrTiO3/rGO Photocatalyst for use in Dye Sensitized Solar Cell (DSSC)

Mahmoudi, Fatemeh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57536 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza
  7. Abstract:
  8. The objective of this research was to fabricate nanocomposites based on reduced graphene oxide (rGO) and strontium titanate (SrTiO₃) and investigate their photovoltaic properties as charge transport platforms in dye-sensitized solar cells (DSSCs). Initially, graphene oxide was prepared using the Hummers method and combined with strontium titanate through a ex-situ approach. Subsequently, strontium titanate based on reduced graphene oxide nanocomposites were obtained using thermal and solvothermal methods. Structural and optical characterization of these nanocomposites was performed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, thermogravimetric analysis (TGA), UV-Vis spectroscopy, and field-emission scanning electron microscopy (FESEM). The results indicated that the degree of reduction varied in the resulting composites. The presence of rGO in the strontium titanate matrix led to increased light absorption and reduced energy bandgap. Both titanium dioxide (TiO₂) nanoparticles and strontium titanate and graphene-based nanocomposites were used in the active layer and the scattering layer to study light absorption and scattering effects. In single-layer photodetectors, a mixture of TiO₂ nanoparticles containing 10% by weight of strontium titanate and strontium titanate based on graphene nanocomposites increased the efficiency of dye-sensitized solar cells by 28% and 38%, respectively. Moreover, in bilayer photodetectors, a combination of TiO₂ nanoparticles in the active layer and a mixture of TiO₂ nanoparticles containing 10% by weight of strontium titanate and strontium titanate based on graphene nanocomposites in the scattering layer improved efficiency by 42% and 44%, respectively. The enhanced efficiency resulted from the incorporation of graphene, which possesses excellent electrical properties, and the composite approach with strontium titanate and TiO₂. These modifications affected light reflection, absorption, carrier separation, and prevented recombination, ultimately leading to increased current density and overall solar cell efficiency
  9. Keywords:
  10. Reduced Graphene Oxide ; Barium Strontium Titanate ; Hydrothermal Method ; Charge Transfer Reaction ; Charge Recombination ; Dye Sensitized Solar Cells ; Strontium Titanate-Reduced Graphene Oxide Nanocomposite ; Photoconversion

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