通过特拉赫兹发射光谱学揭示石墨烯/MoS2异构结构中的非线性光流
Yifan Cheng1, Xian Lin1, Chunwei Wang2,3
1Department of Physics, Shanghai University, Shanghai 200444, China.
The journal of physical chemistry letters
|March 6, 2025
概括
石墨烯和过渡金属二甲基化物异构结构显示出协同非线性效应. 接口电荷转移和光子阻力效应有助于这些新型光电子材料的太赫兹辐射.
科学领域:
- 光电学是指光电子产品.
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 石墨烯 (Gr) 和过渡金属二甲基化物 (TMDs) 的异构结构对光电子有希望.
- 对界面电荷转移 (CT) 的研究广泛,但对非线性效应的探索较少.
研究的目的:
- 在Gr/MoS2异构结构中研究界面CT和非线性光电流之间的协同相互作用.
- 描述Gr/MoS2和MoS2/Gr/MoS2系统中的太赫兹 (THz) 发射机制.
主要方法:
- 使用的特拉赫兹 (THz) 辐射光谱.
- 进行了各种流动,亚齐木图角,冲击角和极化状态的实验.
主要成果:
- 尽管取消了CT光电流,但在MoS2/Gr/MoS2异构中观察到THz排放,表明了其他贡献.
- 确定光子阻力效应 (PDE) 在MoS2/Gr/MoS2中主导THz发射,特别是光子阻力注入电流.
- 发现CT和PDE都对Gr/MoS2中的THz排放有所贡献,CT占主导地位 (5:2比).
结论:
- 在Gr/MoS2异构结构中证明了界面CT和非线性光电流之间的协同作用.
- 确定了主导的THz发射机制 (MoS2/Gr/MoS2中的PDE,Gr/MoS2中的CT和PDE).
- 建立了开发基于这些异构结构的下一代光电子设备的基础.
相关概念视频
01:22MOSFET: Enhancement Mode
258
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
258
01:25MOS Capacitor
663
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
663
01:17Characteristics of MOSFET
316
Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
316
01:20MOSFET: Depletion Mode
300
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
300
01:17MOSFET Amplifiers
139
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
139
01:11P-N junction
442
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
442