Control of Dynamic Structures in Organic Inorganic Hybrid Semiconductors

Organic inorganic hybrid semiconductors exhibit a rich interplay between organic and inorganic components, resulting in unique tunable electronic, optical, and structural properties. Central to their functionality is the control of dynamic structural phenomena, such as phase transitions, lattice distortions, and structural reorganization, which are influenced by external stimuli like temperature, light, or electric fields. I will present strategies to manipulate these dynamic structures, including compositional tuning, external field application, and molecular design. I will begin with our recent observations of controlling and probing hidden polar states in halide perovskites. This approach allows us to drive the polar domains, potentially advancing the ferroic applications of these materials. I will then present our recent work on chiral hybrid perovskites, focusing on the observation of circularly polarized nonlinear optical activity and the understanding of excited state spin-relaxation dynamics in chiral perovskites. These studies provide crucial insights into advancing halide perovskites for applications in microelectronics and spintronics. I will also present the rich phase transition chemistry in hybrid materials and methods for exploring exotic applications.