This webinar presents a molecular approach to the synthesis of high-quality, stable organic-inorganic hybrid perovskite quantum wells for energy harvesting and solid-state lighting. Two-dimensional halide perovskites are exciting new semiconductors that show great promising in low cost and high-performance optoelectronics devices including solar cells, LEDs, photodetectors, transistors, etc. In the first part of this talk, I will present a molecular approach to the synthesis of high-quality organic-inorganic hybrid perovskite quantum wells through incorporating widely tunable organic semiconducting building blocks as the surface capping ligands. By introducing sterically tailored groups into the molecular motif, the strong self-aggregation of the conjugated organic molecules can be suppressed, and single crystalline organic-perovskite hybrid quantum wells and superlattices can be easily obtained via one-step solution-processing. Energy transfer and charge transfer between adjacent organic and inorganic layers are extremely fast and efficient, owing to the atomically-flat interface and ultra-small interlayer distance. Furthermore, this conjugated ligand design greatly enhances materials chemical stability and suppresses halide anion migration. Based on this, we demonstrate for the first time an epitaxial halide perovskite heterostructure with near atomically-sharp interface. Finally, we demonstrate stable and efficient solar cells and LEDs by incorporating the multi-functional conjugated semiconducting ligands in the active layer.
This presentation was part of the Andor Material Science Virtual Conference Feb 2021.