High-endurable memristors based on ReSe₂/BST:YSZ ferroelectric heterojunctions for optical encryption communication

Due to the increasing awareness of space security, encrypted space optic-communication has attracted significant attention. Consequently, ferroelectric memristors with efficient data processing capability and high operational stability become essential. However, inorganic perovskite materials such as Ba_0.6Sr_0.4TiO₃ (BST) typically respond only to near-ultraviolet light, exhibiting relatively weak photo-response currents. In this work, we introduce a two-dimensional ReSe₂/BST:YSZ (BST doped with (ZrO₂)_0.92(Y₂O₃)_0.08) hetero-memristor that demonstrates robust photoelectric capability. The heterostructure achieves visible-light perception through the ferroelectric modulation of ReSe₂ by BST:YSZ, resulting in an optical current switching of up to 50 μA. The device exhibits excellent endurance, maintaining stable optical switching over 30,000 cycles, and enables the simulation implementation of optical logic gates (AND, OR, XNOR, XOR and ODD checker) suitable for airborne information encryption and transmission. Moreover, the hetero-memristor emulates synapse-like regulation behaviors, including transitions between synaptic facilitation and depression under paired-pulse stimulation, and plasticity evolution from long-term potentiation to long-term depression under continuous stimulation. Based on these properties, an optical encryption communication system is demonstrated, achieving a recognition accuracy of up to 99.8%. This work provides a new approach toward integrating photovoltaic and ferroelectric functionalities for secure space communication applications.