在高度无异型的2D分层异构结构中同时表征平面内和横平面电阻
Sizhe Weng1, Yu Wang2,3, Celsey Price4
1Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.
ACS nano
|September 2, 2024
概括
这项研究引入了一种新方法,通过校正接触和电阻来准确测量薄范德瓦尔斯异构的交平面电阻. 这种技术揭示了 (PbSe) 1 (VSe) 2) 1片中显著的电阻异构性和电荷密度波过渡.
科学领域:
- 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
- 纳米技术纳米技术
背景情况:
- 对于先进的电子和光电子应用来说,精确测量范德瓦尔斯异构结构中跨接口的电荷载体传输至关重要.
- 现有的横平面电阻测量的方法受限于对接触和电阻进行校正的需要,通常需要多个设备或复杂的制造步骤.
研究的目的:
- 通过准确计算接触和电阻,开发和验证一种用于提取薄膜内在横平面电阻的新方法.
- 为了研究 (PbSe) 1 (VSe) 2) 1异构结构的电荷载体传输特性和电阻性异构性.
主要方法:
- 采用电流拥挤模型来适应接触端电压的宽度依赖性,使接触和电阻的提取成为可能.
- 这些提取的电阻从二探测器测量中减去,以确定材料的内在横平面电阻.
- 开发的方法应用于 (PbSe) 1(VSe2) 1使用起飞兼容工艺制造的异构结构.
主要成果:
- 该方法成功地提取了固有的横平面电阻,而不需要多个设备或蚀刻.
- 对 (PbSe) 1(VSe2) 1异构结构的测量显示,在6300 K的温度范围内,横平面和内平面电阻之间存在四个数量级的差异.
- 报道了在异构结构的交叉平面传输中观察到电荷密度波过渡的情况.
结论:
- 本方法提供了一种简单而准确的方法来测量薄膜材料的电阻异构性.
- 这些发现突出了显著的异构型运输特性和电荷密度波在 (PbSe) 异构结构中的存在,这与未来的设备应用有关.
相关概念视频
Resistivity
3.4K
When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
3.4K
Non-ohmic Devices
1.1K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.1K
Electrostatic Boundary Conditions in Dielectrics
1.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.1K
Dielectric Polarization in a Capacitor
4.6K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.6K
Design Example: Resistive Touchscreen
294
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
294
Boundary Conditions for Current Density
828
Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
828


