band edge

简明释义

带边沿

英英释义

例句

1.Understanding the band edge (带边) is crucial for designing efficient solar cells.

理解带边（带边）对设计高效太阳能电池至关重要。

2.When studying materials, the band edge (带边) provides insight into their electronic structure.

在研究材料时，带边（带边）提供了对其电子结构的洞察。

3.At the band edge (带边), electron transitions can lead to significant changes in conductivity.

在带边（带边）处，电子跃迁可能导致导电性发生显著变化。

4.The band edge (带边) determines the wavelength at which a semiconductor can absorb light.

带边（带边）决定了半导体可以吸收光的波长。

5.The optical properties of the material change significantly at the band edge (带边) of its absorption spectrum.

该材料的光学特性在其吸收光谱的带边（带边）处发生显著变化。

作文

In the field of solid-state physics, the concept of the band edge plays a crucial role in understanding the electronic properties of materials. The band edge refers to the boundaries of the energy bands in a solid, specifically the conduction band and the valence band. These energy bands are essential for determining how electrons behave within a material, which in turn influences its electrical conductivity, optical properties, and overall functionality. When we discuss the band edge, we are essentially talking about the thresholds that separate the filled states from the empty states in a material's electronic structure.To elaborate further, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature. Conversely, the conduction band is the range of electron energies higher than the valence band, where electrons can move freely and conduct electricity. The band edge thus represents the maximum energy level of the valence band and the minimum energy level of the conduction band. This distinction is vital because it determines whether a material behaves as a conductor, semiconductor, or insulator.For instance, in semiconductors, the band edge is particularly important. The energy difference between the valence band and the conduction band is known as the bandgap. This bandgap is a critical factor in determining the electrical and optical properties of semiconductor materials. When energy is supplied to a semiconductor, such as through thermal excitation or light absorption, electrons can gain enough energy to jump across the band edge into the conduction band, thereby allowing the material to conduct electricity. This principle is the foundation of many electronic devices, including diodes and transistors.Moreover, the band edge concept is also significant in the field of photonics. In optoelectronic devices, the interaction between light and matter is heavily influenced by the band edge. For example, when light interacts with a semiconductor, photons with energy equal to or greater than the bandgap can be absorbed, resulting in electron excitation across the band edge. This process is fundamental to the operation of solar cells, LEDs, and laser diodes, where the manipulation of light and electrical energy is critical.In conclusion, the band edge is a fundamental concept that underpins much of modern electronics and materials science. Understanding the band edge allows scientists and engineers to design and optimize materials for specific applications, ranging from everyday electronic devices to advanced photonic systems. As technology continues to evolve, the importance of mastering the principles surrounding the band edge will only grow, paving the way for innovations that harness the unique properties of materials at the atomic level.

在固态物理学领域，带边的概念在理解材料的电子特性方面起着至关重要的作用。带边指的是固体中能带的边界，特别是导带和价带。这些能带对于确定电子在材料中的行为至关重要，进而影响其电导率、光学特性和整体功能。当我们讨论带边时，实际上是在谈论分隔材料电子结构中填充态与空态的阈值。进一步阐述，价带是电子在绝对零度温度下通常存在的最高能量范围。相反，导带是高于价带的电子能量范围，在这里电子可以自由移动并导电。因此，带边代表了价带的最大能量水平和导带的最小能量水平。这一区别至关重要，因为它决定了材料是作为导体、半导体还是绝缘体。例如，在半导体中，带边尤其重要。价带和导带之间的能量差称为带隙。这个带隙是决定半导体材料电气和光学特性的关键因素。当通过热激发或光吸收等方式向半导体提供能量时，电子可以获得足够的能量跃迁过带边进入导带，从而使材料能够导电。这个原理是许多电子设备（包括二极管和晶体管）的基础。此外，带边概念在光子学领域也具有重要意义。在光电设备中，光与物质之间的相互作用受到带边的很大影响。例如，当光与半导体相互作用时，能量等于或大于带隙的光子可以被吸收，导致电子跃迁过带边。这个过程是太阳能电池、LED和激光二极管等装置的基本原理，其中光和电能的操控至关重要。总之，带边是现代电子学和材料科学中一个基础性的概念。理解带边使科学家和工程师能够设计和优化特定应用的材料，从日常电子设备到先进的光子系统。随着技术的不断发展，掌握围绕带边的原理的重要性只会增加，为利用材料在原子层面上的独特特性铺平道路。