Tong Guoqing, Li Huan, Zhu Zhifeng, Zhang Yan, Yu Linwei, Xu Jun, Jiang Yang
School of Materials Science and Engineering , Hefei University of Technology , Hefei 230009 , People's Republic of China.
National Laboratory of Solid State Microstructures and School of Electronics Science and Engineering/Collaborative Innovation Centre of Advanced Microstructures , Nanjing University , Nanjing 210093 , People's Republic of China.
J Phys Chem Lett. 2018 Apr 5;9(7):1592-1599. doi: 10.1021/acs.jpclett.8b00429. Epub 2018 Mar 15.
Hybrid perovskite photodetectors (PDs) exhibit outstanding performance in the ultraviolet-visible (UV-vis) spectrum but have poor detectability in the deep ultraviolet (DUV) region (200-350 nm). In this work, a novel inorganic-hybrid architecture that incorporates a dual-phase (CsPbBr-CsPbBr) inorganic perovskite material as a down-conversion window layer and a hybrid perovskite as a light capture layer was prepared to achieve faster, highly sensitive photodetection in the DUV spectrum. A dual-phase inorganic perovskite film coated on the back surface of the photodetector enables strong light absorption and tunes the incident energy into emission bands that are optimized for the perovskite photodetector. The presence of CsPbBr enhances the capture and down-conversion of the incident DUV light. Due to the down-conversion and transport of the DUV photons, a self-driven perovskite photodetector with this composite structure exhibits a fast response time of 7.8/33.6 μs and a high responsivity of 49.4 mA W at 254 nm without extra power supply.
混合钙钛矿光电探测器（PDs）在紫外-可见（UV-vis）光谱中表现出优异的性能，但在深紫外（DUV）区域（200-350nm）的探测能力较差。在这项工作中，制备了一种新型的无机-混合结构，该结构包含双相（CsPbBr₃-CsPbBr₂）无机钙钛矿材料作为下转换窗口层和混合钙钛矿作为光捕获层，以在DUV光谱中实现更快、更高灵敏度的光电探测。涂覆在光电探测器背面的双相无机钙钛矿薄膜能够实现强光吸收，并将入射能量调谐到针对钙钛矿光电探测器优化的发射带。CsPbBr₂的存在增强了对入射DUV光的捕获和下转换。由于DUV光子的下转换和传输，这种具有复合结构的自驱动钙钛矿光电探测器在254nm处表现出7.8/33.6μs的快速响应时间和49.4mA W⁻¹的高响应度，无需额外电源。
