ABSTRACT: Over the last decade, impressive developments in lead halide perovskites (LHPs) have made them leading candidate materials for photovoltaics (PVs), X-ray scintillators, and light-emitting diodes (LEDs). The success of LHPs NCs in lighting and display applications is mainly due to their tunable bandgap, narrow emission, high photoluminescence quantum yield (PLQY), and cost-effective fabrication. Consequently, a comprehensive understanding of the design principles of LHP NCs will fuel further innovations in their optoelectronic applications.
This dissertation centers on the synthesis and self-assembly of LHP NCs. At first, we examine the chemistry and capability of different colloidal synthetic routes with regard to controlling the shape, size, and dimensionality of the resulting LHPs NCs, including 0D nanospheres, 2D nanoplates, and 3D nanocubes. Starting from the LHPs NCs, nanowires, nanoplates, and superstructures were successfully obtained via various self-assembly strategies. We systematically investigated the mechanisms of LHP NC self-assembly, the kinetics of their morphological evolution and phase transitions, and driving forces that govern the self-assembly process. The assembled LHP NCs manifest desirable properties (e.g., superfluorescence, improved photoluminescence lifetime; and enhanced stability against moisture, light, electron-beam irradiation, and thermal-degradation) that translate into dramatic improvements in device performance.