Artificial Astrocyte Memristor with Recoverable Linearity for Neuromorphic Computing,Advanced Electronic Materials

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Artificial Astrocyte Memristor with Recoverable Linearity for Neuromorphic Computing
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-09-14 , DOI: 10.1002/aelm.202100669
Caidie Cheng _{1,

2} , Yanghao Wang ₂ , Liying Xu ₂ , Keqin Liu ₂ , Bingjie Dang ₂ , Yingming Lu ₂ , Xiaoqin Yan ₁ , Ru Huang _{2,

3,

4} , Yuchao Yang _{2,

3,

4}

Affiliation

Neuromorphic systems provide a potential solution for overcoming von Neumann bottleneck and realizing computing with low energy consumption and latency. However, the neuromorphic devices utilized to construct the neuromorphic systems always focus on artificial synapses and neurons, and neglected the important role of astrocyte cells. Here, an astrocyte memristor is demonstrated with encapsulated yttria-stabilized zirconia (YSZ) to emulate the function of astrocyte cells in biology. Due to the high oxygen vacancy concentration and resultant high ionic conductivity of YSZ, significantly lower forming and set voltages are achieved in the artificial astrocyte, along with high endurance (>10¹¹). More importantly, the nonlinearity in current-voltage characteristics that usually emerge as the testing cycle increases can be depressed in the astrocyte memristor, and the nonlinearity can also be reversed by applying a refresh operation, which implements the role of biological astrocyte in maintaining the normal activity of neurons. The recovery of linearity can dramatically improve the accuracy of Modified National Institute of Standards and Technology dataset classification from 62.98% to 94.75% when the inputs are encoded in voltage amplitudes. The astrocyte memristor in this work with improved performance and linearity recovery characteristics can well emulate the function of astrocyte cells in biology and have great potential for neuromorphic computing.

中文翻译：

用于神经形态计算的具有可恢复线性的人工星形胶质细胞忆阻器

神经形态系统为克服冯诺依曼瓶颈和实现低能耗和低延迟计算提供了潜在的解决方案。然而，用于构建神经拟态系统的神经拟态装置始终侧重于人工突触和神经元，而忽略了星形胶质细胞的重要作用。在这里，用封装的氧化钇稳定氧化锆 (YSZ) 演示了星形胶质忆阻器，以模拟星形胶质细胞在生物学中的功能。由于 YSZ 的高氧空位浓度和由此产生的高离子电导率，在人造星形胶质细胞中实现了显着降低的形成和设定电压，以及高耐久性 (>10 ¹¹）。更重要的是，星形胶质忆阻器中通常会随着测试周期的增加而出现的电流-电压特性的非线性可以被抑制，并且非线性也可以通过应用刷新操作来逆转，从而实现生物星形胶质细胞维持正常的作用。神经元的活动。当输入以电压幅度编码时，线性度的恢复可以显着提高美国国家标准与技术研究院数据集分类的准确性，从 62.98% 提高到 94.75%。这项工作中的星形胶质细胞忆阻器具有改进的性能和线性恢复特性，可以很好地模拟星形胶质细胞在生物学中的功能，具有巨大的神经形态计算潜力。

更新日期：2021-09-14

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