Synthesis of Ternary Copper Halide Nanomaterials for Optoelectronic Applications

Abstract

This thesis illustrates the synthesis of ternary copper halides (TCH) of various morphologies for optoelectronic applications. Chapter 1 introduces lead (Pb)-free metal halide perovskites, focusing on their optoelectronic properties and applications in optoelectronics. TCH are particularly highlighted by illustrating their crystal structure, synthesis methods, photophysics and applications. Chapter 2 details various synthesis methods for TCH nanomaterials and characterization techniques, including electron microscopy and optical spectroscopy. Chapter 3 discusses the synthesis of cesium copper bromide (Cs₃Cu₂Br₅) nanorods (NRs) with improved photoluminescence quantum yield (PLQY) of 63% and anisotropy (0.201) by dithiol ligand exchange, along with the proposal of the bidentate ligand-assisted directed growth mechanism. Chapter 4 presents a drop-casting method for synthesizing cesium copper iodide (Cs₃Cu₂I₅) in-situ in porous polyethylene terephthalate (PET) films with good morphology and PLQY. Overall, the thesis advances TCH nanomaterial research for their potential applications in optoelectronics.

Date of Award	2025
Original language	English
Awarding Institution	The Hong Kong University of Science and Technology
Supervisor	Jonathan Eugene HALPERT (Supervisor)