Ultraviolet Photodetector based on Sr₂Nb₃O₁₀ Perovskite Nanosheets

Liquid-phase exfoliation was employed to synthesize Sr₂Nb₃O₁₀ perovskite nanosheets with thicknesses down to 1.76 nm. Transmission electron microscopy (TEM), atomic force microscope (AFM), X-ray photoelectron spectrometer (XPS), and other characterization techniques were used to evaluate the atomic structure and chemical composition of the exfoliated nanosheets. A UV photodetector based on individual Sr₂Nb₃O₁₀ nanosheets was prepared to demonstrate the application of an ultraviolet (UV) photodetector. The UV photodetector exhibited outstanding photocurrent and responsivity with a responsivity of 3 × 10⁵ A·W⁻¹ at 5 V bias under 280 nm illumination, a photocurrent of 60 nA, and an on/off ratio of 3 × 10².