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Flexible Solar Cells Based on Nanostructured Tin Perovskite Compounds

Arabloo, Shaghayegh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57769 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. One type of solar cell that has gained significant attention among researchers globally and demonstrated considerable efficiency is the lead-based perovskite solar cell. However, due to the high toxicity of lead and its harmful environmental effects, combined with low stability against moisture and oxygen, the widespread application of these cells has been limited. Therefore, extensive research is currently being conducted to eliminate lead from the perovskite structure and develop tin-based perovskite solar cells. In this study, colloidal solutions of CsSnI3 perovskite nanoparticles were processed using the Hot Injection method. By replacing long-chain ligands like oleic acid and oleylamine with short-chain ligands such as mercaptopropionic acid, charge carrier transfer was improved. As a result, flexible and non-flexible solar cells achieved maximum efficiencies of 7.03% and 7.57%, respectively. X-ray diffraction (XRD) tests revealed that the processed nanoparticles possess high purity and crystallinity. Additionally, photoluminescence tests showed that 73% of the colloidal nanoparticle solution's emission was retained after one month in ambient atmosphere, indicating good colloidal stability. Furthermore, the structure and performance of the fabricated cells were thoroughly evaluated using scanning electron microscopy (SEM) images, current-voltage (J-V) tests, and electrochemical impedance spectroscopy (EIS) tests. The results of ligand exchange in nanoparticle processing indicated a reduction in surface defects and improved charge carrier transfer, leading to a decrease in the series resistance of the non-flexible solar cell from 42.55 Ω to 34.65 Ω. This study also employed bending tests to determine the potential of the fabricated flexible solar cells for applications requiring flexibility. After 1000 bending cycles, the efficiency of the flexible cell decreased by 46%, retaining 54% of its initial efficiency. The stability of CsSnI3 nanoparticle-based perovskite solar cells against environmental factors were also investigated. The fabricated solar cells were stored in ambient atmosphere (average humidity 40%). After one month, the efficiencies of flexible and non-flexible solar cells reached 72% and 84% of their initial efficiencies, respectively. After two months, these cells retained 41% and 68% of their initial efficiencies, respectively. The results of this study highlight the high potential of CsSnI3 nanoparticle-based flexible solar cells as a reliable and eco-friendly energy source for self-charging wearable devices
  9. Keywords:
  10. Flexible Solar Cell ; Perovskite ; Perovskite-Based Solar Cell ; Cesium Tin Iodide (CsSnI3)Nanoparticles ; Oleic Acid

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