•연구자: 물리학과 오홍석
•발표일: 2023.12.23
•DOI: https://doi.org/10.1109/JSTQE.2023.3345488
•Hyerin Jo et al., IEEE Journal of Selected Topics in Quantum Electronics (Q1), (2023)
•Abstract
We report the fabrication of flexible photonic synapses using vertically grown ZnO nanotubes on graphene layers. Position- and morphology-controlled ZnO nanotubes were heteroepitaxially grown on multilayer graphene layers and served as flexible channels for synaptic devices. Current–voltage characterizations under different light illumination conditions, as well as a study of the temperature-dependent transient photocurrent, revealed the origin of persistent photoconductivity of the device. Importantly, the device exhibited excellent synaptic properties upon application of light pulses, such as excitatory post-synaptic currents and paired pulse facilitations. For the long-term plasticity, potentiation-depression characteristics with high linearity were successfully implemented with good reliability. These features were observed even under different bending conditions, confirming the flexibility of the device. A simulation study suggested that the device will exhibit excellent performance when integrated into neural network structures.