Self-Powered Ultraviolet Photodetectors Based on In Situ Growth Position-Controllable ZnO@Zn ₃ (HHTP) ₂ Core–Shell Arrays

Conjugated conductive metal-organic frameworks (MOFs) have garnered widespread attention in the field of optoelectronics due to their excellent electrical conductivity and unique porous structures. Currently, the interaction between MOF materials and semiconductors predominantly relies on van der Waals forces, which weaken the transport efficiency of interfacial carriers and limit their application in the field of photodetectors. Here, we constructed a ZnO/conjugated conductive MOF core-shell array through in situ growth and successfully fabricated a position-controllable self-powered UV photodetector. Our results confirm that the ordered and controllable microrod array structure can effectively reduce charge hopping at disordered interfaces, promote directional carrier migration, and significantly enhance the photodetector's light absorption efficiency. Furthermore, the conjugated conductive MOFs, which serve as a surface passivation transport layer, function as a functional interface to effectively passivate the surface defects of ZnO, reduce the carrier trapping efficiency, and improve the fast-response characteristics of the device. It is noteworthy that the photodetector fabricated via the in situ growth method achieved a rapid response with a rise time of 1.062 ms and recorded a maximum photovoltaic responsivity of 3109 V/W. This study offers a new perspective for the broader integration of emerging MOF materials into advanced optoelectronic devices.