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Optical and Electrical Properties of Nanostructures Prepared by Hydrothermal Method for Application in Nanostructured Solar Cell Electrode

Chizari, Fatemeh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43981 (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 one dimentianal TiO2 nanostructures and nanoheterostructures on TiO2 nanofibers in order to use them in Dye Sensitized Solar Cells (DSC). Nanofibers of titanium oxide have been fabricated using hydrothermal method. Then, hierarchical TiO2 nanostructures were grown on the nanofibers via another hydrothermal step. Increasing the effective surface of nanofibers, we achieved two secondary architectures from fibers:1-Nanoparticular fibers (TiO2 nanoparticles grown on nanofibers).2-Nanostars.After fabrication, the SEM and XRD characterizations were provided. Furthermore, the suitable pastes of these nanostructures were prepared for application in DSCs and were used in the photoelectrodes at two configurations:- Scattering layer (deposited on TiO2 nanoparticle layer).-Composition of those nanostructures with TiO2 nanoparticles.At the next step of project, various kind of electrical and optical characterizations were done on these prepared cells, for instance:•Volt-Current and IPCE measurements to evaluate photovoltaic properties.•Diffuse-Reflectance measurement to evaluate optical properties.•IMVS, IMPS, Voc-decay, measurements to evaluate electrical properties.Based on the results, it was found that these new nanostructures especially the nanostars have very considerable light scattering properties. The electrical properties of them were comparable with nanoparticles. It is exciting that the best efficiency was obtained with the composition of 10% nanostars in nanoparticle paste.At the end of project we tried to simulate the utilization of nanofibers and nanoparticular fibers as the scattering layers or composite layers in order to compare the conclusion with the experiments
  9. Keywords:
  10. Dye Sensitized Solar Cells ; Nanofiber ; Modified Nanofiber ; Nanoparticular Fiber ; Nanostars ; Titanium Dioxide ; Titanium Oxide Nanofiber ; Hydrothermal Method

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