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Fabrication of Transparent and Flexible Conductive Electrode based on Silver Nanowires for Application in Perovskite Solar Cells

Gholami, Mostafa | 2024

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57704 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza; Taghavinia, Nima; Naimeh Naseri
  7. Abstract:
  8. Solar cells can be a solution to the challenges of energy and the environment. Perovskite solar cells are currently very popular, with an efficiency of around 25%. Silver nanowires are being considered as the next generation of flexible transparent electrodes in solar cells. Their stability is the most important challenge. Perovskite cells were fabricated in the laboratory, and the best efficiency of 14.3% was achieved with a gold electrode. Silver nanowires were synthesized using the polyol method with an average diameter of approximately 65 nanometers and an average length of about 13 micrometers. The spray method was used to deposit nanowires at temperatures between 100 and 200°C. When the substrate temperature at the time of spraying was higher, a higher criterion of merit (transmission to resistance ratio) was obtained. The nanowires were deposited on Teflon film as a non-stick layer and transferred onto the cell using a spot pressing method. An efficiency of 9% was achieved with this method. Furthermore, a flexible transparent conductive electrode was created by embedding silver nanowires on the surface of polystyrene and depositing a gold electrical layer on the outer nanowires for increased stability. XPS results confirmed the gold coating on the surface of the silver nanowires. The transparency of the PS-AgNW sample, with a sheet resistance of 24 Ω/□, was measured at 83.9%. By adding a gold coating in the PS-AgNW@Au (20-40-60) samples, transparency decreased in the range of 6.8 to 10.6%. The stability of the samples was tested in UV-Ozone and nitric acid environments and the results showed that the gold-coated samples exhibited higher stability. The enhanced adhesion between silver nanowires and the substrate was successfully tested in both PS-AgNW and PS-AgNW@Au (n) samples. Furthermore, the flexibility of these samples was significantly higher compared to commercial flexible ITO electrodes
  9. Keywords:
  10. Perovskite-Based Solar Cell ; Silver Nanowire ; Flexible Transparent Electrode ; Stability ; Perovskite ; Gold Electrodeposition

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