Flexible Photonic Synapses Using Vertical ZnO Nanotubes on Graphene Films
- Authors
- Jo, Hyerin; Ali, Asad; Oh, Won Suk; An, Sung Jin; Yi, Gyu-Chul; Oh, Hongseok
- Issue Date
- May-2024
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Photonic synapse; ZnO; neuromorphic devices
- Citation
- IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, v.30, no.3
- Journal Title
- IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
- Volume
- 30
- Number
- 3
- URI
- https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/49338
- DOI
- 10.1109/JSTQE.2023.3345488
- ISSN
- 1077-260X
1558-4542
- 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.
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