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Fabrication of one Dimensional Nano-Structured of Titanium Dioxide and their Application in Dye Sensitized Solar Cells

Rahimi, Sanam | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44381 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Iraji Zad, Azam
  7. Abstract:
  8. In this research we focus on study and fabrication of titanium dioxide nanofibers and their application in preparation of dye sensitized solar cell’s photo anode in order to improve optical and electrical properties. Titanium dioxide nanofibers was prepared by electroespinning method. To investigate the effect of nanofiber diameter on optical and electrical properties of photo anode, three different diameter of titanium dioxide nanofibers with diameters of 100-200 nm, 200-300 nm and 500-600 nm was prepared by varying the type or amount of polymer in the electrospinning solution and fixing other conditions of electrospinning process. By use of these structures, paste of pure fibers in form of distinct and mixture of fibers was employed as light scattering layer in photo anode. In addition, paste of combination of fibers with diameter of 200-300 nm with 20 nm sized titanium dioxide nanoparticles with different ratios was used as active and light scattering photoanode layer. By hydrothermal method 250 nm long titanium dioxide branches was grown on fibers with diameter of 200-300 nm and their effect on active layer and light scattering layer of photo anode was studied. According to the results, maximum conversion efficiency of 8.1% with short circuit current of 20.6 mA/cm^2and open circuit voltage of 0.68 V was yielded from cells include one layer of 20 nm sized titanium dioxide nanoparticles and one layer of combination of 20 nm sized titanium dioxide nanoparticles and nanofibers with 200-300 nm in diameter with ratio of 25% nanofiber to nanoparticle. This result was confirm that adding nanofiber to nanoparticle electrode cause improvement in both optical and electrical properties of photoanode
  9. Keywords:
  10. Electrospinning ; Titanium Oxide Nanofiber ; Titanium Oxide ; Dye Sensitized Solar Cells

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