Study of solution-based Cs0.1FA0.9Pb(I0.9Br0.1)3 perovskite deposition with scalable technology for solar cell production : Characterization of optical properties and function of the solar cell

• Main Author: Laskar, Tasnim
• Format: Others
• Language: English
• Published: Uppsala universitet, Fysikalisk kemi 2021
• Subjects: Physical Chemistry; Fysikalisk kemi
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457242

Climate change is one of the greatest challenges of the 21st century and is the reason for several environmental changes on earth. One reason behind climate change includes the rise ingreenhouse gas emissions in the atmosphere due to the burning of coal, gas and oil, i.e. fossil fuels. Fossil fuels are currently the world’s primary source of energy and alternative solutions are there for necessary to mitigate climate change, for example by utilizing solar cells. Perovskite solar cells have gain a lot of attention due to its rapid improvement in power conversion efficiency. In parallel with the advances in performance and stability, the challenges of commercialization have arisen. Therefore scalable technology is required to facilitate for large-area fabrication as well as a quality improvement in the perovskite film. The purpose of this project was to characterize the optical properties and functions of the perovskite solar cell when using the precursor solution of Cs0.1FA0.9Pb(I0.9Br0.1)3 for semi-upscaled technique. Additionally, this project investigated different elements in the slot-die coater process to optimize the performance of the solar cell, including the fabrication process of the precursor solution, the size of the substrates and to optimize the functionality of the electron transport layer. Four different trials were conducted in this study using a solution-based technique from  Cs0.1FA0.9Pb(I0.9Br0.1)3 perovskite powder while varying different parameters in the cell design and geometric shapes of the substrates. These trials were compared to a reference trial using Cs0.1FA0.9PbI3 through solar cell characterization and material characterization, including current-voltage measurements, incident photon-to-current efficiency, X-ray diffraction, UV/vis/NIR spectrophotometry and scanning electron microscopy. The results show that the power conversion efficiency increased when adding bromide into the perovskite structure. Furthermore, a shift in the band gap was observed during the material characterization. Trial 4 consisted of using SnO2 as the electron transport layer, developing a powder perovskite and adding a 2D additive layer to the cell design, displayed the best performance. In conclusion, the addition of bromide in Cs0.1FA0.9Pb(I0.9Br0.1)3 did increase the performance of the solar cells and the band gap of the perovskite solar cells was tunable.