Leveraging Metal Sites in Doped Metal Halide Perovskites toward Enhanced Photocatalysis: Fundamentals and Applications

Abstract

Metal halide perovskites (MHPs) with unique structures and excellent photoelectric properties are deemed as a promising photocatalytic material to eliminate the rising environmental and energy issues. However, MHPs often suffer from poor stability, fast charge carrier recombination rate, deficiency of active sites, and band gap mismatch. The structure and electronic properties of MHPs can be regulated by metal doping strategies and can be applied to various photocatalytic applications. A desired landscape on the relationships between doping strategies regulation-functional applications of MHPs has yet not presented a systematic exposition and summary, which is critical for the rational design of the metal-doped MHPs. This review first briefly introduced the structural features of MHPs, and then discussed the effects generated by different kinds of metal doping, including main group metal doping, transition metal doping, and rare earth metal doping. Subsequently, various preparation methods for doped MHPs and applications in photocatalytic energy transformation and environmental remediation were summarized. Finally, we presented the remaining challenges and future opportunities in the development of metal-doped MHPs for photocatalysis. We believe this review would stimulate deeper thinking about the doping strategies-properties regulation-functional applications interplays and accelerate more extensive applications of metal-doped MHPs within the thrilling area of photocatalysis.