Synaptic Plasticity and Metaplasticity of Biological Synapse Realized in a KNbO3 Memristor for Application to Artificial Synapse
Synaptic Plasticity and Metaplasticity of Biological Synapse Realized in a KNbO3 Memristor for Application to Artificial Synapse
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DOI：
10.1021/acsami.8b04550
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发表时间：
2018-08-01
影响因子：
9.5
通讯作者：
Nahm, Sahn
中科院分区：
文献类型：
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作者：
Lee, Tae-Ho;Hwang, Hyun-Gyu;Nahm, Sahn
在TiN/SiO_2/Si衬底上生长了非晶态KNbO_3(KN)薄膜，合成了KN记忆阻器作为潜在的人工突触。铂/KN/TiN忆阻器表现出典型而可靠的双极开关行为，具有多个电阻级。它还显示了生物突触的传输特性，具有良好的电导调制线性。此外，KN忆阻器可以通过控制增强峰的数目和速率来模拟各种生物突触可塑性特征，包括短期可塑性、长期可塑性、峰率依赖可塑性、成对脉冲易化和强直后突触增强。作为生物突触的一种基本特性，尖峰时序相关可塑性(STDP)也在KN忆阻器中实现。KN忆阻器的突触可塑性可以用氧空位运动和氧空位细丝来解释。生物突触的变塑性也在KN忆阻器中实现，包括长时程增强和长时程增强和长时程增强抑制的变塑性以及STDP的变塑性。因此，KN忆阻器可以作为神经形态计算系统中的人工突触。
Amorphous KNbO3 (KN) films were grown on a TiN/SiO2/Si substrate to synthesize a KN memristor as a potential artificial synapse. The Pt/KN/TiN memristor exhibited typical and reliable bipolar switching behavior with multiple resistance levels. It also showed the transmission properties of a biological synapse, with a good conductance modulation linearity. Moreover, the KN memristor can emulate various biological synaptic plasticity characteristics including short-term plasticity, long-term plasticity, spike-rate dependent plasticity, paired-pulse facilitation, and post-tetanic potentiation by controlling the number and rate of the potentiation spike. Spike-timing-dependent plasticity (STDP), which is an essential property of biological synapses, is also realized in the KN memristor. The synaptic plasticity of the KN memristor can be explained by oxygen vacancy movement and oxygen vacancy filaments. The metaplasticity of biological synapses was also implemented in the KN memristor, including the metaplasticity of long-term potentiation and depression, and of STDP. Therefore, the KN memristor could be used as an artificial synapse in neuromorphic computing systems.