Egg shell membrane based electrolyte gated oxide neuromorphic transistor

Li Yan; Chen Xin-Li; Wang Wei-Sheng; Shi Zhi-Wen; Zhu Li-Qiang

doi:10.7498/aps.72.20230411

Abstract

In recent years, the study of neuromorphic devices has received extensive attention. It is becoming an important branch of the development of artificial intelligence technology. At the same time, natural biomaterials have several priorities, such as biodegradability, good biocompatibility, and non-toxicity, and have important value in novel portable intelligent systems. The egg shell membrane (ESM) is a fiber scaffold composed of highly crosslinked collagen, glycoprotein and cysteine-rich eggshell membrane proteins. It has porous morphology, thermal stability, mechanical strength, etc. Therefore, these protein-based fiber membranes have several potential applications, including nanocatalysts, microbial fuel cells, and adsorption of toxic dyes. This study adopts ESM as electrolyte, exhibiting extremely high proton conductivity of about 6.4×10^–3 S/cm and extremely high electric-double-layer (EDL) capacitance of about 2.8 µF/cm² at room temperature. Thus, it has extremely strong interfacial EDL electrostatic modulation capability. Then, indium tin oxide EDL transistor is fabricated by using a single step masking processing and magnetron sputtering deposition technology. The device exhibits typical n-type output curves and transfer curves at low operating voltage. In addition, transfer curves are scanned twice. It is observed that the curves approach to each other quite well, indicating the good stabilities. Owing to the extremely strong proton gating effects, the device exhibits excellent electrical performances. Specifically, ON/OFF ratio, mobility and sub-threshold swing are estimated to be about 2.5×10⁶, about 3.2 cm²/(V·s), and about 213 mV/dec, respectively. With the unique interfacial EDL modulation activities of ESM, the transistor can mimic some important synaptic plasticity behaviors, such as excitatory postsynaptic current (EPSC) and paired pulse facilitation (PPF). With the increase of pre-synaptic spike amplitude, the EPSC value increases correspondingly. With the increase of pre-synaptic spike frequency, the EPSC grain increases, indicating the potentials in high-pass synaptic filtering. By loading 64 potentiation spikes and 64 depression spikes, multi-level synaptic weight can be updated, demonstrating potentiation activity and depression activity. Again, with the same potentiation spikes and depression spikes, synaptic weight value curves approach to each other quite well, indicating that the present ESM gated oxide neuromorphic transistor has good stability. Then, an artificial neural network is adopted to perform supervised learning with Modified National Institute of Standards and Technology (MNIST) database. For simulation, a two-layer multilayer perceptron (MLP) neural network with 400 input neurons, 100 hidden neurons and 10 output neurons is adopted. The best recognition accuracy is as high as 92.59%. The proposed ESM gated oxide neuromorphic transistors have certain potentials in low-cost biodegradable neuromorphic systems.

Keywords:

Authors and contacts

School of Physical Science and Technology, Ningbo University, Ningbo 315211, China

Corresponding author: Zhu Li-Qiang, zhuliqiang@nbu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 51972316, U22A2075) and the Ningbo Key Scientific and Technological Project, China (Grant No. 2021Z116).

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References

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Cited By

图 1 (a) ESM电解质膜栅控ITO神经形态晶体管的制备流程示意图, 插图是器件的照片; (b) 鸡蛋壳内ESM内外双层分层情况照片; (c) ESM内膜内表面的SEM显微形貌照片; (d) ESM内膜外表面的SEM显微形貌照片; (e) ESM膜的截面SEM照片; (f) ESM膜的傅里叶变换红外光谱(FTIR)

Figure 1. (a) Device processing of ESM electrolyte gated ITO neuromoprhic transistor; Inset: photograph of device; (b) photograph of ESM double layer in egg shell; (c) SEM morphology image of ESM inner membrane inner surface; (d) SEM morphology image of ESM inner membrane outer surface; (e) SEM cross sectional image of ESM inner membrane; (f) Fourier transform infrared spectroscopy of ESM.

DownLoad: Full-Size Img PowerPoint

图 2 (a) ESM膜电解质的单位面积电容与频率关系曲线, 插图为ITO/ESM/ITO三明治电容结构示意图; (b) ESM膜电解质的阻抗频谱数据, 插图为ESM膜的漏电特性

Figure 2. (a) Frequency-dependent capacitance of ESM based electrolyte; Inset: schematic diagram of ITO/ESM/ITO sandwiched testing structure; (b) impedance spectroscopy data of ESM; Inset: leakage current.

DownLoad: Full-Size Img PowerPoint

图 3 ESM栅控ITO神经形态晶体管的(a)输出特性曲线和(b)转移特性曲线. 图(b)中黑线为第一次扫描, 红线为第二次扫描

Figure 3. Electrical performances of ESM gated ITO neuromorphic transistor: (a) Output characteristic curves; (b) transfer characteristic curves (black symbol, the first scan; red symbol, the second scan).

DownLoad: Full-Size Img PowerPoint

图 4 (a) 生物突触结构(左)及ITO神经形态晶体管(右)示意图; (b) 典型的EPSC响应, 读取电压V_ds = 0.5 V, 前突触刺激为(1 V, 10 ms); (c) 两个前突触刺激下的EPSC响应, 前突触刺激为(1 V, 10 ms), 间隔时间∆t = 20 ms; (d) η随Δt的变化关系

Figure 4. (a) Schematic diagram of a synapse (left) and ITO neuromorphic transistor (right); (b) typical EPSC response triggered with a presynaptic spike (1 V, 10 ms), V_ds = 0.5 V; (c) EPSC response triggered with paired presynaptic spikes (1 V, 10 ms), interval time Δt = 20 ms; (d) η as a function of Δt value.

DownLoad: Full-Size Img PowerPoint

图 5 (a) 不同刺激强度下的EPSC相应; (b) 不同频率刺激序列下的EPSC响应; (c) 高通滤波功能示意图; (d) EPSC幅值增益与刺激频率的关系.

Figure 5. (a) EPSC responses under different presynaptic spike amplitude; (b) EPSC responses under spike trains with different frequency; (c) schematic diagram of high-pass filtering; (d) EPSC grain as a function of spike frequency.

DownLoad: Full-Size Img PowerPoint

图 6 (a) 施加在ITO神经形态晶体管上的刺激信号示意图; (b), (c) 不同增强脉冲和抑制脉冲刺激下的权重更新结果; (d) 两层MLP模拟器的示意图, 由400个输入神经元、100个隐藏神经元和10个输出神经元组成; (e) MNIST识别精度

Figure 6. (a) Schematic diagram of spike loaded on ITO neuromorphic transistor; (b) and (c) synaptic weight updating obtained under different potentiation/depression spikes; (d) schematic diagram of two-layer MLP simulator, consisting of 400 input neurons, 100 hidden neurons and 10 output neurons; (e) recognition accuracies for MNIST patterns.

DownLoad: Full-Size Img PowerPoint

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[11]	Shao F, Feng P, Wan C J, Wan X, Yang Y, Shi Y, Wan Q 2017 Adv. Electron. Mater. 3 1600509 Google Scholar
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