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Nano Structure TiO2 Films by Hybrid PEO-Hydrothermal Method for Dye Sensitised Solar Cell Applications

Shakoorian, Sheida | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45493 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi-Sani, Mohammad Ali; Mohammadpour, R
  7. Abstract:
  8. This thesis demonstrate a new hybrid Plasma Electrolytic Oxidation (PEO)-Hydrothermal method to produce a nano-structured TiO2 layer over a titanium substrate. Microstructural characterization was carried out by using a FE-SEM to explore nano scale structural changes due to hydrothermal treatment. More over EDS was used to analyse elements of the coating. The FE-SEM images confirmed formation of a 3D network consisting “nano flakes+nano fibers”after 6 or 12 hours and a ”sea urchin like nanostructure+nano fibers” after 24 hour. To improve the performance of nano-structured photoelectrodes, different electrolytes were studied to achieve maximum amount of anatase phase. the best results was obtained by a phosphate electrolyte containing P25 nanoparticles. The specific surface area of the coatings were determined by loading and de-loading of N719 dyes from the surface of nano-structured photoelectrodes. The maximum surface area was about 660 cm2, showing a high ability of coating for dye loading. According to the Photovoltaic efficiency test results of DSSCs assembled with hydrothermally treated photoelectrodes for different periods, the maximum efficiency, photovoltage and the photocurrent density are respectively about 0.65%, 700 mV and 1.4 mA/cm2
  9. Keywords:
  10. Titanium Oxide ; Nanostructure ; Solar Cells ; Plasma Electrolytic Oxidation ; Hydrothermal Method

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