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Synthesis of Titania Hollow Spheres in Dye Sensitized Solar Cell Application

Tabari Saadi, Yasaman | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46358 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza
  7. Abstract:
  8. In the current research, Anatase-Rutile Titania hollow spheres were synthesized using hydrothermally prepared carbon spheres as template. Different calcination temperatures were used to remove carbon template and crysalized Titania. The characterizations for the physicochemical properties of prepared samples were carried out by XRD, FESEM, XPS, DRS, UV-Vis and FTIR.It is found that doping of carbon in the crystal structure of Titania hollow sphere, cause red shift in band gap wavelenght and the absorption wavelength edge was expanded to the visible light region and the additional diffusive electronic states were observed on the valence band spectra of samples.The photoelectric conversion performances of dye-sensitized solar cells (DSSCs) based on TiO2 hollow spheres as a single photoanode layer and Titania nanoparticle/hollow sphere as a double layer were investigated. The light scattering of overlayer hollow spheres enhances harvesting light of the DSSCs and the underlayer TiO2 nanoparticle layer ensures good electronic contact between film electrode and the F-doped tin oxide (FTO) glass substrate. In addition these studies revealed that the thickness of TiO2 hollow sphere has a significant impact on the cell performance and the suggested optimum thickness was 18 micometers with 7.02% efficiency and a higher performance of the DSSC (Jsc =20.38 mAcm−2, Voc = 0.734 V, and η = 8.55%) is obtained for Titania nanoparticle/hollow sphere as a double layer of photoanode
  9. Keywords:
  10. Scattering Layer ; Dye Sensitized Solar Cells ; Titania Hollow Sphere ; Carbon Template ; Optimized Photoanode Thickness

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