Bi₂O₂Se纳米片的可控合成及光电性能研究

Bi₂O₂Se nanosheets were synthesized by molten salt method by using Bismuth nitrate pentahydrate as bismuth source, selenium powder as selenium source and hydrazine hydrate as reducing agent at different concentrations of NaOH (0~3 mol/L). The morphology, structure and composition of the samples were characterized by XRD, SEM, TEM and XPS. Then, a wide spectrum self-powered detector was prepared by using Bi₂O₂Se as the working electrode, and their photoelectric detection performance was investigated. The test results show that the Bi₂O₂Se self-powered detector has the best photoelectric detection performance under the condition of 1.1 mol/L NaOH. In the UV-Vis-IR band, it has a high response. Under 365 nm UV light, the photocurrent can reach 7.8 μA, and the rise and fall time are 30 and 21 ms, respectively. The responsivity and detectivity are 4.2×10^-4 A/W and 1.02×10⁹ Jones, respectively.