PROCESSI DI TRASFERIMENTO DI ENERGIA IN QUANTUM DOTS DI PEROVSKITE ALOGENURO PIOMBO

Due to their unique optoelectronic properties colloidal lead halide perovskite quantum dots (LHP QDs) have received much attention in the recent years. With a near-unity photoluminescence (PL) quantum yield and highly tuneable PL of small spectral width, this group of materials is of interest for research and applications such as light-emitting devices and photovoltaics. The solution processability of colloidal QDs makes them compabtible with various manufacturing techniques like spin-/spray-coating and injekt printing. Together with the scalability of colloidal synthesis, this might offer a pathway for industrial use in future applications. However, colloidal quantum dots are surrounded by a shell of ligands, stabilizing them in solution and preventing aggregation. These ligands can act as energy barriers between QDs, hindering efficient charge and energy transfer, therefore impairing the performance of QD-based devices (e.g., charge carrier extraction in solar cells). Within the scope of this work, different size CsPbBr3 QDs are synthesized and energy transfer processes are investigated using time-resolved photoluminescence spectroscopy. In particular, the influence of various ligands of varying carbon chain length on these processes is studied.