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Growth of Perovskite Film based on Lead Iodide by Controlling Deposition Parameters for Solar Cells Application

Tafazoli, Saeedeh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50522 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza; Seyed Reihani, Morteza; Riahi, Nastaran
  7. Abstract:
  8. Perovskite solar cells, with high efficiency operation, have been candidated as a cost-effective and environmentally friendly technology. Despite the great progress, there are some primarily issues remained regarding to the perovskite film and its fabrication methods. A very common perovskite cell structure is FTO/TiO2/CH3NH3PbI3/Spiro-OMeTAD/Au. Although, this structure has some advantages, lack of full surface coverage of perovskite film leads researchers to put much effort on finding other constructions. This surface inhomogeneity reduces the amount of light absorption and therefore efficiency. One way to produce a complete and uniform film is applying mixed-halide composition; such as Cl-I and Br-I into perovskite composition. In this study, we studied the effect of chloride on morphology, structure, optical properties and photovoltaic parameters of samples through field emission scanning electron microscopy, X-Ray Diffraction, UV-visible spectroscopy, and I-V(under AM 1.5 sunlight simulation) respectively. Two-step method has been applied to deposit perovskite layer in ambient air. We also investigate different methods of perovskite deposition to provide a uniform and pin-hole free surface and more efficient samples. Finally, sample fabricated by Spin-VASP (vapor assisted solution process) method as a modified second step in two-step deposition process and containing 2% PbCl2 achieved the highest efficiency (8.44%) among other methods
  9. Keywords:
  10. Morphology ; Perovskite-Based Solar Cell ; Fabrication ; Coating ; Deposit Morphology ; Mixed Halide

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