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Fabrication and Characterization of Carbon-based Perovskite Solar Cells

Ramin Afshar, Camellia | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 51291 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza
  7. Abstract:
  8. Hole-transporter-free perovskite solar cells with structure of TiO2/ZrO2/C triple-layer scaffold filled with perovskite are great alternative to the conventional ones due to the possibility of making full printable low-cost and stable devices. In the present work, the impacts of the structures of the quadruple layer scaffold in the form of TiO2/ZrO2/NiO/C and triple layer scaffold in the form of TiO2/ZrO2/C on their photovoltaic performance are studied. In addition, the effects of thickness and deposition method of each layer were investigated as well as the effect of compounding of the carbon counter electrode. All devices were constructed by a simple printable method. Electrochemical impedance spectroscopy was employed to optimize the thickness of the layers. FESEM images showed that there are recommended pores available in the scaffold to infiltrate the Perovskite solution inside the structure and from cross-section images the thickness of each layer made by different deposition methods or conditions was studied as well. XRD analysis revealed that all triple layers with the desired crystal structure were deposited by the printable method. It was found that the cell with standard structure made by the best thickness and the best deposition route obtained in the present work leads to a power conversion efficiency of 10.7% under ambient condition (i.e., relative humidity of 20-30% and room temperature). Furthermore, the device showed remarkable stability around 3500 h. Although NiO film acted as a hole-transporting layer, no significant difference in photovoltaic characteristics of the device was observed. A device in a large scale (1.5*2cm2 active areas) with cell efficiency of almost 9% and a 9.5*5 cm2 module with a 2.2 volt, Voc and 14.5 mA real current under real sunlight was also fabricated
  9. Keywords:
  10. Perovskite-Based Solar Cell ; Carbon Counter Electrode ; Hole Transporter Material (HTM) Free Cells ; Fully Printable Components ; Quadruple Layer Scaffold

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