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Zhong, Wen-Min; Tang, Xin-Gui; Liu, Qiu-Xiang; Jiang, Yan-Ping
Materials & design, October 2022, 2022-10-00, 2022-10-01, Volume: 222Journal Article
Display omitted •Photoelectric co-excited ferroelectric artificial synapse is reported.•Bi2FeMnO6 of R3c phase is reported for the first time with ferroelectricity.•The neural network based on Bi2FeMnO6 synapse achieves 98.80% handwritten digit recognition accuracy. Photoelectric synapse is a new type of artificial synapse that combines light pulse excitation and electrical pulse excitation, and is an important component for the development of neuromorphic hardware. In this work, the Bi2FeMnO6 ferroelectric artificial synapse with optoelectronic response is reported. It can generate an excitatory post-synaptic current through ultraviolet light irradiation and then modulate the excitatory post-synaptic current through ferroelectric polarization, thereby realizing a photo-ferroelectric dual-control synapse. A training method based on ultraviolet excitation and ferroelectric enhancement is proposed, which greatly reduced the number of training pulses and increased the plasticity of the synapse. The optimized spike scheme based on ferroelectricity is proposed, which made the synapse have very linear weight adjustment function. This synapse is used to build a convolutional neural network, which can achieve 98.80% recognition accuracy on the MNIST dataset. In addition, the ferroelectricity and multi-level resistive switching effect of synapse have also been reported.
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