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Investigation of Ion Migration in Multi-Cationic Perovskite Solar Cells and its Effect on Their Stability

Abdollahi, Habib | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57020 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza; Ashuri, Hossein
  7. Abstract:
  8. Today, factors such as the growing energy consumption in the world, followed by the reduction of fossil fuel reserves, and more importantly, the global warming phenomenon due to excessive consumption of fossil fuels have caused attention towards clean energy, especially solar energy, to increase significantly. Researchers throughout the world are looking for solar cells with high efficiency and stability, and of course affordable. In today's world, one of the materials that has grabbed the researchers' attention is perovskite. The reason behind this is that in the last decade, there has been a significant increase in the efficiency of perovskite solar cells to surpass that of Silicon solar cells. Although Perovskite solar cells have good efficiency, the stability-related issues of these cells are the biggest obstacle to their wide use and commercialization. It is worth mentioning that the presence of factors such as oxygen and humidity, as well as the occurrence of ion migration phenomenon such as Cs+, FA+, and MA+ cations in the structure cause a rapid drop in efficiency. In this research, three-cationic perovskite thin film solar cells including methylammonium, formamidinium, and Cesium cations were made by the spin coating method. Moreover, using the ligand-assisted reprecipitation (LARP) method, FAPbI3 quantum dots were synthesized. Using these quantum dots at the interface of the Tri-cationic perovskite layer and hole transport layer, the efficiency and stability of the solar cell remarkably increased so the cell efficiency increased from 15.13% to 16.96%. Next, by doing tests such as the current density-voltage (J-V) test and the electrochemical impedance spectroscopy (EIS), the reasons for increasing efficiency and the stability of cells were investigated and it was found that the prevention of ion migration phenomenon is one of the main factors of this improvement
  9. Keywords:
  10. Electrochemical Analysis ; Electromigration ; Mixed Cation Perovskite ; Perovskite-Based Solar Cell ; Solar Energy

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