Excitons in Single-Crystal Halide Perovskite Heterostructures

The distinctive excitonic behavior of organic-inorganic 2D halide perovskites affords many useful properties, such as sharp band-edge emission with high color purity and broad self-trapped emission with high color rendition. We recently devised a method to interleave a different 2D sublattice between the sheets of a 2D halide perovskite. These single-crystalline halide perovskite heterostructures afford a highly tunable platform for manipulating photogenerated excitons. I will discuss the physical and electronic structures of halide perovskite heterostructures, with a focus on new properties that arise due to the perovskite-nonperovskite interface.