基于电荷捕捉机制的高重量更新性能的人工突触
Zishuo Han1,2, Yanhui Xing1, Yu Lin2,3
1Key Laboratory of Optoelectronics Technology, Ministry of Education, College of Microelectronics, Beijing University of Technology, Beijing 100124, China.
ACS applied materials & interfaces
|March 12, 2025
概括
研究人员使用2D ReS2/CTL/h-BN异质连接开发了先进的人工突触. 这项创新通过减少非线性和增强重量更新中的对称性,显著提高了突触设备的性能.
科学领域:
- 神经形态工程的神经形态工程
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 人工突触对神经形态硬件至关重要,旨在模仿生物突触动力学,以实现高效的神经网络.
- 由于高非线性和低对称性,当前的二维 (2D) 材料异质连接面临动态重量更新的限制.
研究的目的:
- 为了设计新的2D异质连接人工突触,改进重量更新特性.
- 调查电荷捕获层在调节突触性能中的作用.
- 模拟适应性行为,如人类眼睛的反应,使用光电子调制.
主要方法:
- 2D ReS2/CTL/h-BN异质连接的制造,通过将h-BN用氧等离子体处理,以创建一个电荷捕获层 (CTL).
- 突触性能的表征,包括记忆窗口和体重更新特征 (长期增强/抑郁 - LTP/D).
- 对陷状态对设备性能和设备结构优化影响的机制的分析.
主要成果:
- 制造出来的设备展示了一个大内存窗口和出色的突触性能.
- 该设备通过光电子双脉冲调制成功模拟了适应性行为,模仿了人眼.
- 优化的LTP/D重量更新显示非线性性减少 (0.63) 和对称性改善 (41.25),超过了之前报告的设备.
结论:
- 与现有技术相比,开发的2D ReS2/CTL/h-BN异质连接突触提供了优越的重量更新性能.
- 该研究提供了关键的见解,通过理解和控制充电捕获层中的陷状态来优化突触器件.
- 这项研究为神经形态计算中更高效和高质量的人工神经网络铺平了道路.
相关概念视频
01:25Long-term Potentiation
2.7K
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
Hebbian LTP
LTP can occur when...
2.7K
02:47The Synapse
121.6K
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
121.6K
01:26Chemical Synapses
8.6K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
8.6K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.1K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.1K
01:28Electrical Synapses
8.1K
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
8.1K
01:28Integration of Synaptic Events
1.4K
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability...
1.4K