2D Perovskite Oxides toward High-Performance Ultraviolet Photodetection

Abstract

Ultraviolet (UV) light, spanning wavelengths from 10 to 400 nm, is ubiquitous in military, livelihood, and scientific domains. Accurate UV photodetection is therefore essential for monitoring environmental radiation, safeguarding human health, and advancing technological applications in fields such as aerospace, medical science, and ecology. The fabrication of high-performance UV photodetection devices fundamentally depends on the development of high-sensitivity UV photosensitive materials. The evolution of UV photodetection materials has progressed from early wide-bandgap semiconductors like ZnS and ZnSe to third-generation semiconductors such as GaN and Ga₂O₃, and most recently to two-dimensional (2D) wide-bandgap materials that combine exceptional optoelectronic properties with compelling physicochemical properties. Among these, 2D perovskite oxides stand out due to their prominent advantages for UV detection. First, this large family of materials generally features wide bandgaps, strong UV absorption, and high spectral selectivity. Second, the tunable bandgaps of 2D perovskite oxides enable precise detection at specific wavelengths. Third, their excellent processability and flexibility facilitate feasible integration into devices, making them promising candidates for flexible photodetectors. Furthermore, 2D perovskite oxides boast other properties such as high stability, dielectricity, ferroelectricity, and biocompatibility. These characteristics have promoted the blossoming of 2D perovskite oxides for high-performance UV photodetection and are poised to expand their applications in novel functional optoelectronics.