Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
Browse
2 results
Search Results
Master Thesis Fabrication of Perovskite Solar Cells Using Ultrasonic Spray Coating(Izmir Institute of Technology, 2022) Ceyhan, Eray; Sarı, EmrePerovskite solar cells (PSCs) are one of the most prominent research field for the last decade in photovoltaic technology. From 3.8 percent in 2009 to 25.7 percent in 2021 in single-junction architectures, and to 29.8 percent in silicon-based tandem cells, solar cell efficiencies of laboratory-scale devices using these materials have increased, surpassing the maximum efficiency achieved in single-junction silicon solar cells. Therefore, as of now, perovskite solar cells represented the solar technology that was developing the fastest. Perovskite solar cells have gained commercial appeal thanks to their extremely low production costs and promise for even higher efficiency. Their short- and long-term stability are key issues and research topics. In this context, the development of scalable perovskite solar cell fabrication has become essential. A novel ultrasonic spray casting technique is employed by incorporating hot nitrogen gas blowing as a scalable deposition method. We tried to optimize the perovskite film crystallization by applying our technique. With the help of our hot nitrogen gas blowing pipe we are able to enhance the nucleation process and at a desired levels. These investigations are supported by characterization tools such as optical microscope, scanning tunneling microscope, and current-voltage measurement. MAPb(I1-xBrx)3 precursor solution containing DMF and DMSO as solvent was used in our experiments. We examined the effect on the surface roughness change by adjusting the DMF and DMSO ratios. Finally, we construct a device of FTO/ c-TiO2/ m-TiO2/ MAPb(I1-xBrx)3/Spiro-OMeTAD/Au architecture and able to investigate the electrical characteristic of under dark and illumination.Master Thesis Manufacturing and Characterization of Perovskite Thin Films Using Novel Methods(Izmir Institute of Technology, 2020) Bıyıklı, Ozan; Sarı, Emre; Tekin, Hüseyin CumhurPerovskite photovoltaics is a promising technology due to its low-cost fabrication and high efficiency. Since their first demonstration in 2009, efficiencies of perovskite solar cells (PSCs) increased unprecedently fast from 3.81% to 25.2% in 10 years. The most common method for the deposition of the absorber layer of the perovskite solar cells is the spin-coating method, which is not a scalable method, and this method is an obstacle to their commercialization. Efficiencies obtained with scalable methods are currently lower than that of the spin-coating method. In this thesis, among the scalable deposition methods, a novel ultrasonic spray-coating was used by adding antisolvent vapor to the system. The antisolvent quenching technique, that is commonly used to improve the crystalline quality of the film by spin-coating was successfully adapted for ultrasonic spray coating. The interaction between diethyl ether (DE) vapor, which is used as an antisolvent, and MAPb(I(3-x)Brx)3 precursor solution (where the solvent is DMF:DMSO, 4:1) was utilized to improve the crystalline quality of the perovskite film. As a result of this interaction, the intermediate phase was observed. The transition to the intermediate phase is supported by data from characterization methods such as optical microscopy, scanning electron microscopy (SEM), X-Ray diffraction (XRD), and current-voltage measurement. Furthermore, n-i-p devices with the FTO/c-TiO2/m-TiO2/MAPb(I(1-x)Brx)3/Spiro-OMeTAD architecture were produced with different antisolvent vapors and their efficiencies was compared. It was observed that devices using DE vapor reach higher efficiencies than devices without any antisolvent vapor.