An elastic and reconfigurable synaptic transistor based on a stretchable bilayer semiconductor
An elastic and reconfigurable synaptic transistor based on a stretchable bilayer semiconductor
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DOI：
10.1038/s41928-022-00836-5
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发表时间：
2022-09-29
影响因子：
34.3
通讯作者：
Yu, Cunjiang
中科院分区：
文献类型：
--
作者：
Shim, Hyunseok;Ershad, Faheem;Yu, Cunjiang
大脑腹侧被盖区的神经元含有单一的轴突终末，释放兴奋性和抑制性神经递质，创造可重新配置的突触行为。人造突触晶体管表现出类似的兴奋和抑制行为--因此突触功能重新配置--可以在不同的应用中提供不同的功能和高效的计算。然而，其中一些应用，如软机器人和可穿戴电子设备，需要机械柔软和可变形的突触设备。在这里，我们报告了一种弹性和可重新配置的突触晶体管，即使在机械应变下也表现出抑制和兴奋特性。突触设备使用顶部栅极配置，并使用可拉伸的双层半导体和封装弹性体作为栅电介质。当突触前脉冲仅为80 mV时，该设备显示出记忆特性，导致低比能量消耗。将人工神经网络应用于修正的国家标准与技术研究所数据集的双向图像识别，即使在晶体管拉伸50%的情况下，识别准确率也达到90%以上。使用可伸缩的双层半导体作为通道，以封装弹性体作为介质的人工突触晶体管，即使在50%的应变下，也可以表现出兴奋和抑制突触行为。
Neurons of the ventral tegmental area of the brain contain single axon terminals that release excitatory and inhibitory neurotransmitters, creating reconfigurable synaptic behaviour. Artificial synaptic transistors that exhibit similar excitatory and inhibitory behaviour-and hence synaptic function reconfiguration-could provide diverse functionality and efficient computing in various applications. However, some of these applications, such as soft robotics and wearable electronics, require synaptic devices that are mechanically soft and deformable. Here we report an elastic and reconfigurable synaptic transistor that exhibits inhibitory and excitatory characteristics even under mechanical strain. The synaptic device uses a top-gated configuration and is made using a stretchable bilayer semiconductor and an encapsulating elastomer as the gate dielectric. The device exhibits memory characteristics when operating with a presynaptic pulse of only 80 mV, resulting in a low specific energy consumption. When applied to a model artificial neural network for dual-directional image recognition of the Modified National Institute of Standards and Technology dataset, a recognition accuracy of over 90% is achieved even when the transistors are stretched by 50%.An artificial synaptic transistor that uses a stretchable bilayer semiconductor as the channel and an encapsulating elastomer as the dielectric can exhibit both excitatory and inhibitory synaptic behaviour, even when under 50% strain.