Synthesis and characterization of transport layer for efficient Perovskite solar cell

Abstract

For real-world photovoltaic applications, metal oxide nanomaterials play an important role in various aspects because of their large scale use as different layers in Perovskite solar cells (PSCs). Large scale applications can be achieved by the further development of the device design and manufacturing. This thesis focuses on the application of metal oxide nanomaterial (TiO2) as an electron transport layer in PSCs. Magnesium, Zinc and Silver are used as dopants to modify the properties of pristine TiO2 to achieve higher conductivity, better charge extraction, separation of charge carriers and improved morphology. The reason behind the selection of these dopants is their higher electrical conductivity and comparable ionic radii to titanium. FESEM technique shows the increase in porosity of the doped samples which helps in large absorption of active layer and hence the more carrier generation. UV-VIS spectroscopy suggests the better electron injection from perovskite to TiO2 conduction band in doped samples and is highest in Ag-TiO2. An increase in diffusion length of charge carriers and electrical conductivity has been observed in order Ag-TiO2 gt Zn-TiO2 gt Mg-TiO2 gt TiO2. The power conversion efficiency of the device fabricated by using pristine and doped samples is found to increase and is highest in Ag-TiO2 suggesting it as the best electron transport layer. newline