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Doctor-Blade Printing of The Absorber Layer of Mixed-Cation and anion Perovskite Solar Cells in Ambient Air

Rahbari, Hamed | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56290 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Taghavinia, Nima
  7. Abstract:
  8. In just a decade, perovskite solar cells have emerged as the next generation of photovoltaic technologies due to their high efficiency, low manufacturing cost, and easy fabrication methods compared to silicon solar cells. To date, highly efficient perovskite cells (with an efficiency of approximately 25.5%) have been fabricated on small substrates by a spin-coating process. In the spin coating process, perovskite precursor is spread on the substrate through shear force. However, the reproducibility of the cells coated with this method varies between research laboratories. Furthermore, since the solution is wasted during the deposition of the perovskite precursor on large substrates, a non-uniform layer forms, affecting the efficiency of the fabricated cell. Therefore, the spin coating is inappropriate for the mass production and commercialization of this type of solar cell. Various methods are used to produce high-quality perovskite films and commercialize perovskite solar cells; blade coating, slot-die coating, screen printing, and inkjet printing are some of these methods. A significant improvement in efficiency was achieved through controlling film formation. Due to the sensitivity of perovskite precursors to moisture, it is generally necessary to coat perovskite films in an environment with low humidity (such as Glowbox). Among the mentioned methods to create a uniform and scalable perovskite film, the the coating process by a blade is a suitable, fast, available, and inexpensive method. In this research, perovskite ink was coated by the doctor-blade, and solar cthe ell with FTO or ITO Glass/SnO2/Perovskite/CIGS/Carbon structure was made and evaluated. The substrate speed and the gap between the substrate and the blade were selected as 1000 mm/min and 0.2 mm, respectively. Considering that the layering process was performed in ambient air (humidity above 20%), polyethylene glycol, with a concentration of 6 mg/ml, was added to the precursor as the additive due to prevent moisture absorption in the printed layer and also help the perovskite grains to grow better; Also, using Triton with a concentration of 1.5 mg/ml (as the surfactant), a surface treatment was performed on the electron transfer layer (SnO2) to modify the surface to prevent moisture absorption before coating the perovskite ink. Surface treatment cells constructed by the printing method with additives and in ambient air averaged 10.90% efficiency, which is acceptable when compared with the 13.44% average efficiency of the spin coating method with low humidity
  9. Keywords:
  10. Solar Energy ; Perovskite-Based Solar Cell ; Solar Cells ; Mixed Cation Perovskite ; Doctor Blade ; Mixed Cation and Anion Perovskite ; Doctor-Blade Printing

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