Pressure-induced Dramatic Changes in Optoelectronic Metal Halides

Perovskite-related metal halides exhibit unique structures and outstanding optoelectronic properties that have enabled a wide range of technological applications including solar cells, light-emitting diodes, lasers, and radiation detectors. Two main focuses include understating the structure-property relationships and exploring advanced new materials with enhanced and/or emergent functionalities. In this talk, I will present our recent efforts in investigating metal halides using high pressure, an alternative approach to exploring novel materials with desirable properties that also permit a deeper understanding of a wide range of phenomena. Using the state-of-the-art high-pressure techniques coupled with <i>in situ</i> synchrotron-based and in-laboratory property measurements, we characterized the changes in the lattice, electronic, optical, and optoelectronic properties of various metal halides with different dimensionalities including 3D, 2D, and 1D, and further revealed their structure-property relationships. High-pressure research opens a new way to understand the fundamental mechanisms of optoelectronic metal halides and explore novel materials with superior properties.