Synergistic ZnO/FAPbBr3 Nanocrystals n-n Heterojunction for Low-Bias, Fast, Broadband Photodetection and Memristive Applications

Abstract

Heterojunctions formed between metal halide perovskites and wide-bandgap oxides have emerged as a powerful platform for broadband photodetection, leveraging their complementary optoelectronic properties and tunable interfacial dynamics. In this study, we demonstrate the synergistic integration of an nanocrystals (NCs) heterojunction, enabling efficient broadband photodetection at low bias voltages with rapid response characteristics. Under white light illumination ( ), the device achieves peak photoresponse at bias, exhibiting an impressive on/off current ratio of ~ , a responsivity of , and a specific detectivity of . The engineered interface facilitates effective charge separation and transport, while the spectral overlap between and NCs extends the photoresponse across the visible and near-UV regions. Notably, the device demonstrates fast temporal response with rise and fall times of and , respectively-making it suitable for high-speed imaging applications. Additionally, cyclic voltage sweeps reveal an analog switching behavior, indicative of gradual conductance modulation. This memristive-like response suggests potential utility in neuromorphic systems, where such analog switching can emulate synaptic functionalities. Overall, the NCs heterojunction exemplifies a multifunctional architecture, combining high-performance photodetection with prospects for artificial synapse implementation in next-generation neuromorphic electronics.