Cu<sub>3</sub>(HHTP)<sub>2</sub> c‐MOF/ZnO Ultrafast Ultraviolet Photodetector for Wearable Optoelectronics
Chenxu Kang, Muhammad Ahsan Iqbal, Suyun Zhang, Xiaoliang Weng, Yuting Sun, Lu Qi, Wei Tang, Shuangchen Ruan, Y. J. Zeng
Abstract
Abstract Two‐dimensional conductive metal–organic frameworks (2D c‐MOFs) are a family of highly tunable and electrically conducting materials that can be utilized in optoelectronics. A major issue of 2D c‐MOFs for photodetection is their poor charge separation and recombination dynamics upon illumination. This study demonstrates a Cu 3 (HHTP) 2 /ZnO type‐II heterojunction ultraviolet (UV) photodetector fabricated by layer‐by‐layer (LbL) deposition, in which the charge separation of photogenerated carriers is enhanced. At optimized MOF layer cycles, the device achieves a responsivity of 78.2 A/W and detectivity of 3.8×10 9 Jones at 1 V. Particularly, the device can be operated in the self‐powered mode with an ultrafast response time of 70 μs, which is the record value for MOF‐based photodetectors. In addition, even after 1000‐time bending of 180°, the flexible device maintains stable performance. This flexible MOF‐based UV photodetector with anti‐fatigue and anti‐bending properties provides strong implication to wearable optoelectronics.