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Monolithic Solar Cells with Dye or Perovskite Light Absorbent

Behrouznejad, Fatemeh | 2016

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48444 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. According to Iran's proper location to take advantage of solar energy and the ability of nanostructured solar cells fabrication in the country, in this study, the manufacturing problems and complexities of nanostructured solar cells such as dye solar cells and perovskite-based solar cells are investigated. The chromium metal as an alternative to the transparent conductive substrates in order to reduce the manufacturing cost of dye solar cells (DSCs) and reducing series resistance is introduced in this study. In case of utilizing chromium as a substrate for photoanode, the thickness of CrxOy layer is controlled by depositing TiO2 compact layer and the efficiency of DSC is increased from 2.6% to 4.5%. In case of utilizing chromium as a substrate for the counter-electrode, a low-temperature counter-electrode is prepared by depositing platinum nanoparticles using cyclic-voltammetry method and the maximum efficiencies of 8.8% and 9.5% are obtained for DSCs without TiO2 light scatterer layer and with it respectively. Photolithography method is used for fabricating metal based bracken-like single sided dye-sensitized solar cells with horizontal separation with the advantage of replacing both of substrates with metallic ones. The conventional brittle carbon-based counter-electrode of monolithic structures in DSCs also replaced by the flexible metal foil with chromium coating to decrease series resistance and manufacturing problems. In case of perovskite-based solar cells, the idea of using monolithic carbon-based structure is used with perovskite absorbent to have a full printable structured solar cell. NiO is used as an inorganic hole-transporter in this structure and the effect of insulator layer's thickness is investigated. The expensive Au layer is also replaced with different metals (Pt, Ag, Cu, Ni and Cr) and effects of their work-functions on the photovoltaic properties are studied. The best efficiencies of 16.4% and 12.1% are obtained for the structure with mesoporous TiO2 and Au layer, and Carbon/NiO/CH3NH3PbI3/TiO2 structure respectively
  9. Keywords:
  10. Charge Transfer Resistance ; Dye Sensitized Solar Cells ; Monolithic Dye Sensitized Solar Cells ; Electrochemical Deposition ; Perovskite-Based Solar Cell ; Monolithic Structure ; Series Resistance

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