Zhang Zhi-Xiang, Li Chen, Lu Yu, Tong Xiao-Wei, Liang Feng-Xia, Zhao Xing-Yuan, Wu Di, Xie Chao, Luo Lin-Bao
School of Physics and Engineering and Key Laboratory of Material Physics of Ministry of Education , Zhengzhou University , Zhengzhou, Henan 450052 , China.
J Phys Chem Lett. 2019 Sep 19;10(18):5343-5350. doi: 10.1021/acs.jpclett.9b02390. Epub 2019 Aug 28.
In this work, a sensitive deep ultraviolet (DUV) light photodetector based on inorganic and lead-free CsCuI crystalline film derived by a solution method was reported. Optoelectronic characterization revealed that the perovskite device exhibited nearly no sensitivity to visible illumination with wavelength of 405 nm but exhibited pronounced sensitivity to both DUV and UV light illumination with response speeds of 26.2/49.9 ms for rise/fall time. The / ratio could reach 127. What is more, the responsivity and specific detectivity were calculated to be 64.9 mA W and 6.9 × 10 Jones, respectively. In addition, the device could keep its photoresponsivity after storage in air environment for a month. It is also found that the capability of CsCuI crystalline film device can readily record still DUV image with acceptable resolution. The above results confirm that the DUV photodetector may hold great potential for future DUV optoelectronic device and systems.
在这项工作中，报道了一种基于溶液法制备的无机无铅CsCuI晶体薄膜的灵敏深紫外（DUV）光探测器。光电特性表明，该钙钛矿器件对波长为405 nm的可见光几乎不敏感，但对深紫外光和紫外光照射表现出显著的敏感性，上升/下降时间的响应速度分别为26.2/49.9 ms。/比可达127。此外，计算得到的响应度和比探测率分别为64.9 mA/W和6.9×10 Jones。此外，该器件在空气环境中储存一个月后仍能保持其光响应性。还发现CsCuI晶体薄膜器件能够以可接受的分辨率轻松记录静态深紫外图像。上述结果证实，深紫外光探测器在未来的深紫外光电器件和系统中可能具有巨大潜力。
