Cu3(HHTP)2 c‐MOF/ZnO Ultrafast Ultraviolet Photodetector for Wearable Optoelectronics

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 Cu3(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 3.8×109 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. Wearable ultraviolet photodetector based on 2D c‐MOF Cu3(HHTP)2/ZnO type‐II heterojunction is fabricated by Layer‐by‐layer (LbL) deposition. At optimized MOF layer cycles, the photodetector shows superior photoresponse and outstanding mechanical durability.