Control of polarization in 2D hybrid perovskites

The precise control of polarization in solid-state materials holds immense significance across various scientific disciplines, particularly optics and electronics. This control enables tailored manipulation of light-matter interactions, device functionalities, and electronic properties, leading to a host of practical applications. In this presentation, I will showcase our recent discovery of a broadband optical retardation effect in 2D organic-inorganic hybrid perovskite single crystals. We found that this remarkable optical retardation effect can be attributed to the large in-plane birefringence of 2D hybrid perovskites. We suggest that the broadband optical retardation effect arises due to the formation of mosaicity among the stacked inorganic layers, resulting in out-of-plane disorder during the self-assembly process of single crystals in the solution phase. I will discuss the design principles for tuning mosaicity and the robustness of these materials for transformative impacts.