UC San Diego

Metal halide perovskites have demonstrated tremendous promising electronic and optoelectronic properties that make them appealing in various device applications. Even though surprising improvement has been achieved during the past few years in polycrystalline perovskite-based devices, problems of their intrinsic high defects level, existence of grain boundaries, strong ion migration rates, and poor stabilities can heavily hinder the further development of polycrystalline perovskite electronics and their realistic applications. In contrast, their single-crystal counterpart is well-studied to have much better crystalline qualities, enhanced electrical properties, and excellent material stabilities, making them intriguing for reaching advanced device performance and realistic applications. However, the development of single-crystal perovskite electronic devices is still in its infancy; even the controlling over dimensions, scalabilities, morphologies, and compositions on single-crystal perovskites, are still challenging.

Based on those motivations, this research aims to develop a general platform for realizing single-crystal metal halide perovskites electronics from the material growth to the thin-film device fabrication. The solution-based chemical epitaxy method, the lithography and etching approaches, and the transfer printing processes will be combined together to form this fabrication protocol, which is also compatible with the conventional semiconductor processes.

In Chapter One, the basic properties of metal halide perovskites and the current problems presented in this field will be introduced and discussed. In Chapter Two, an epitaxial growth method of metal halide perovskite will be introduced. Our work presents the first controllable growth of single-crystal perovskites with different dimensions, morphologies, crystalline orientations, and compositions. In Chapter Three, a general fabrication process for metal halide single-crystal perovskite electronic integrations will be introduced. Our work presents a reliable approach to integrate metal halide single-crystal perovskite into electronics/microelectronics. In Chapter Four, a general strategy for fabricating flexible metal halide single-crystal perovskite electronics will be introduced. Our work presents the first realization of flexible single-crystal perovskite electronics/micro-electronics, which paves the way for realizing high-performance single-crystal metal halide perovskites wearable electronics.