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SnO2 Layer Curing as a Low Temperature Electron Transporting Layer in Perovskite Solar Cell

Ghasemi, Fatemeh | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55362 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. Perovskite solar cells have attracted much attention due to their high photovoltaic performance. The excellent performance of perovskite solar cells is attributed to the superior electrical properties of each layer, including the electron-transporting layer, the light-absorbing layer, and the hole-transporting layer. The electron transport layer plays a key role in influencing the photovoltaic parameters of perovskite solar cells. SnO2 is considered as an ideal electron transport layer for perovskite solar cells due to its high carrier mobility, deep conduction band, suitable band gap and low temperature processing. Surface modification of SnO2 has significantly improved device performance over the past years, but there is still great potential to further improve its efficiency and long-term stability. The aim of this project is to modify the surface of SnO2, to improve the quality of the electron transporting layer and create a good interface with perovskite. Thioacetamide was used to modify the SnO2 surface. The results showed that the modified SnO2 layer with thioacetamide has more perovskite absorption in the visible region compared to the control sample. Also, the decrease in the intensity of the photoluminescence spectrum in the modified sample indicates the improvement of electron extraction and charge transport from the perovskite layer to the electron transport layer. The study of solar cell performance shows that the photovoltaic parameters of the cell in the modified sample have better and more repeatable results. Also, using Mott-Schottky analysis, it was found that the conduction band of the modified sample is closer to the conduction level of perovskite, which leads to better charge transport from perovskite to the electron transport layer. According to the SCLC analysis, the conductivity of the modified layer has increased compared to the control sample, which can be due to the increase in the density of donor atoms. Finally, the best efficiency was obtained for the perovskite solar cell based on SnO2 modified with thioacetamide, an efficiency of 15.15%
  9. Keywords:
  10. Electron Transporting Layer ; Low Temperature ; Perovskite-Based Solar Cell ; Tin Dioxide ; Thioacetamide ; Surface Traps

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