概括
用添加的富勒 (C60) 薄膜的电电阻在特定度下,在室温附近表现出金属的行为. 兴奋剂水平影响导电性,在K3C60膜中观察到最小的电阻.
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
- 固态化学 固态化学
背景情况:
- 富勒 (C60) 薄膜被研究其电气性能.
- 用性金属对富勒进行兴奋剂显著改变了其电子行为.
研究的目的:
- 为了研究添加的富勒烯 (C60) 薄膜的电电阻.
- 为了确定兴奋剂度和电阻之间的关系.
- 了解影响观察到的电性质的微观结构.
主要方法:
- 在超高真空中 doping 期间测量富勒烯薄膜的电阻.
- 测量K ((chi) C ((60)) 膜的温度和度依赖的电阻.
- 现场雷达福德反射光谱测量用于静脉测量测定.
主要成果:
- 电阻的过渡从金属 (在chi ≈ 3) 到激活 (如chi → 0 或 6).
- 对于K ((3) C ((60)) 薄膜,最小电阻为2.2微欧姆-厘米,接近Mott极限.
- 提出的颗粒微观结构模型,其中K(3) C(60) 区域形成非穿透的颗粒.
结论:
- 兴奋剂度严重影响富勒烯膜的电电阻.
- 立体测量K(3) C(60) 显示出最小的电阻,表明金属的行为.
- 一个颗粒状的微观结构影响了化富勒烯薄膜的导电性.
相关概念视频
01:22Resistivity
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:
00:51Non-ohmic Devices
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 diode...
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
01:13Electrical Conductivity
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...