全金属氧化物异质连接光电子突触与多层记忆,用于人工视觉感知应用
Jo-Lin Chen1, Tsung-Che Chiang1, Po-Tsun Liu1
1Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30078, Taiwan.
Small (Weinheim an der Bergstrasse, Germany)
|May 3, 2025
概括
这项研究引入了一种用于神经形态视觉系统的新型WO3/InWZnO异质连接晶体管. 它有效模拟人类视觉记忆,并在图像识别任务中实现高精度.
科学领域:
- 材料科学 材料科学 材料科学
- 神经科学是一个神经科学.
- 电气工程 电气工程
背景情况:
- 基于金属氧化物半导体的光电子突触晶体管对于节能和稳定的神经形态计算至关重要.
- 模仿人类视觉系统需要能够模仿突触可塑性和记忆功能的设备.
研究的目的:
- 提出和研究一个新的WO3/InWZnO异质连接光电子突触晶体管.
- 展示其模拟人类视觉系统的潜力及其在神经形态视觉系统中的应用.
主要方法:
- 一个WO3/InWZnO异质连接突触晶体管的制造.
- 光学响应的表征,短期记忆 (STM) 到长期记忆 (LTM) 的转换,配对脉冲促进 (PPF) 和后增强 (PTP).
- 实现多层感知器 (MLP) 和U-Net模型用于手写数字识别和图像细分.
主要成果:
- 在650nm时实现了高光学响应度 (58.37 A W-1).
- 成功模拟了从STM到LTM的转换,并通过photogating证明了长期的多层存储.
- 在460nm光线下表现出最佳的PPF (176%) 和PTP (890%) 指数.
- 对于扭曲的手写数字,MLP模型达到了87.4%的准确度;U-Net在图像分割方面达到了74.5%的准确度.
结论:
- WO3/InWZnO异质连接突触晶体管显示了高级神经形态视觉系统的巨大潜力.
- 该设备模拟突触功能的能力以及其在图像识别和细分方面的性能突显了其可行性.
相关概念视频
01:24Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
01:26Chemical Synapses
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...
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:26Visual System
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Once through the pupil, the light passes through the lens, a...