Ultrawide Bandgap Organic–Inorganic Hybrid Perovskite [C₆N₂H₁₈][CdCl₄] for Solar-Blind Ultraviolet Detection

Solar-blind ultraviolet (UV) detection is a core technology for applications such as environmental monitoring, flame detection, and remote early warning response. So far, there are still very few inorganic–organic hybrid perovskites (OIHPs) with the characteristic of the absorption edge in the solar-blind UV region. Herein, we present a high-performance solar-blind UV photodetector based on a two-dimensional (2D) OIHPs [C₆N₂H₁₈][CdCl₄], which exhibits a direct bandgap of 5.13 eV and an exceptional carrier lifetime of 504 μs. The device demonstrates a remarkable photocurrent of 152.1 nA/cm²and a rapid response time of 35 μs under 254 nm UV illumination. Compared to traditional inorganic detectors (e.g., Ga₂O₃, AlGaN), this hybrid material offers structural flexibility and low-temperature solution processability, addressing the trade-offs between sensitivity and mechanical robustness. Our work pioneers the use of ultrawide bandgap OIHPs for solar-blind UV sensing, providing a viable alternative to rigid inorganic semiconductors.