Low-Dimensional Metal Halide Perovskite Crystal Materials: Structure Strategies and Luminescence Applications

Replacing methylammonium (MA(+)), formamidine (FA(+)), and/or cesium (Cs+) in 3D metal halide perovskites by larger organic cations have built a series of low-dimensional metal halide perovskites (LDMHPs) in which the inorganic metal halide octahedra arranging in the forms of 2D layers, 1D chains, and 0D points. These LDMHPs exhibit significantly different optoelectronic properties from 3D metal halide perovskites (MHPs) due to their unique quantum confinement effects and large exciton binding energies. In particular, LDMHPs often have excellent broadband luminescence from self-trapped excitons. Chemical composition, hydrogen bonding, and external factors (temperature and pressure etc.) determine structures and influence photoelectric properties of LDMHPs greatly, and especially it seems that there is no definite regulation to predict the structure and photoelectric properties when a random cation, metal, and halide is chosen to design a LDMHP. Therefore, this review discusses the construction strategies of the recent reported LDMHPs and their application progress in the luminescence field for a better understanding of these factors and a prospect for LDMHPs' development in the future.

Automated summary

Replacing smaller organic cations in 3D metal halide perovskites with larger ones has led to the development of low-dimensional metal halide perovskites (LDMHPs) with unique optoelectronic properties such as quantum confinement effects and large exciton binding energies. The structures and photoelectric properties of LDMHPs are greatly influenced by factors such as chemical composition, hydrogen bonding, and external conditions, making it difficult to predict their specific properties. Research on the construction strategies and applications of LDMHPs aims to understand these factors better and explore the future development of LDMHPs.