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Enhancing Hybrid Perovskite Detectability in the Deep Ultraviolet Region with Down-Conversion Dual-Phase (CsPbBr3–Cs4PbBr6) Films
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1021/acs.jpclett.8b00429
Guoqing Tong 1 , Huan Li 1 , Zhifeng Zhu 1 , Yan Zhang 1 , Linwei Yu 2 , Jun Xu 2 , Yang Jiang 1
Affiliation  

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 (CsPbBr3–Cs4PbBr6) 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 Cs4PbBr6 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–1 at 254 nm without extra power supply.

中文翻译:

使用向下转换双相(CsPbBr 3 –Cs 4 PbBr 6)膜增强深紫外区域的混合钙钛矿检测能力

混合钙钛矿光电探测器(PDs)在紫外可见(UV-vis)光谱中表现出出色的性能,但在深紫外(DUV)区域(200–350 nm)中的可检测性较差。在这项工作中,准备了一种新颖的无机混合结构,该结构结合了双相(CsPbBr 3 –Cs 4 PbBr 6)无机钙钛矿材料作为下转换窗口层,并混合了钙钛矿作为光捕获层,以实现更快的速度, DUV光谱中的高灵敏度光电检测。涂覆在光电探测器背面的双相无机钙钛矿膜可实现强光吸收,并将入射能量调整到针对钙钛矿光电探测器已优化的发射带。Cs 4 PbBr的存在图6增强了入射DUV光的捕获和下转换。由于DUV光子的下转换和传输,具有这种复合结构的自驱动钙钛矿光电探测器在254 nm波长下具有7.8 / 33.6μs的快速响应时间和49.4 mA W –1的高响应度,而无需额外的电源。
更新日期:2018-03-13
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