Structural regulation and optical behavior of three-dimensional metal halide perovskites under pressure

The high-pressure behavior of three-dimensional (3D) metal halide perovskites (MHPs) has been extensively studied. Prior to the means of high-pressure fever, most experimental efforts to study the structure and optical behavior of 3D MHPs focused on dopants and dimensional reduction. The structure and properties of 3D MHPs can be regulatedin situand continuously controlled by applying high pressure, which cannot be achieved with traditional chemical methods. In this review, recent progress on studies on the response to pressure of the structure, optical properties, and carrier dynamics of 3D MHPs was summarized. The underlying mechanism of the high-pressure behavior of 3D MHPs was discussed comprehensively. Future research directions on 3D MHPs were also outlined to guide further investigations. This review aimed to provide a basis for facilitating the understanding of timely developments in emerging high-pressure perovskite-related research fields.