相关实验视频
Updated: Jun 12, 2025
11:32
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
21.5K
纯六角钻石具有对称性兴奋剂特性.
Yuhao Zheng1,2,3, Shaohua Lu1,2,3, Chengke Chen1,2,3
1College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
ACS applied materials & interfaces
|September 24, 2024
概括
六角形 (2H) 钻石与立方 (3C) 钻石相比,提供了更好的电子和孔移动性. 其有利的兴奋对称性允许更容易的n型和p型导电性,为先进的电子设备铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 计算材料科学科学 计算材料科学
背景情况:
- 宽带间隙材料对于电子设备至关重要,但不对称的兴奋剂,特别是n型钻石,仍然是一个重大挑战.
- 目前的兴奋剂限制阻碍了钻石在先进电子产品中的全部应用潜力.
研究的目的:
- 为了研究六种多种类型的钻石中各种元素的兴奋剂行为.
- 为了识别具有有利的电子特性和兴奋剂特征的钻石多类型,以提高设备性能.
- 为应对宽带隙间材料中不对称兴奋剂的挑战.
主要方法:
- 对六种多种类型的钻石进行计算调查.
- 用各种元素进行兴奋剂模拟,以分析带结构和载体有效质量.
- 计算杂质形成能量,供体/接受体水平和电离能.
主要成果:
- 纯六边形 (2H) 钻石的带隙为4.42 eV,在研究的多型中具有最小的载波有效质量.
- 与3C钻石相比,2H钻石显示出显著更高的电子 (4250厘米2·V-1·s-1) 和孔 (5840厘米2·V-1·s-1) 流动性.
- 和在2H钻石中表现出较低的电离能 (分别为0.14 eV和0.19 eV),相比于3C钻石 (0.32 eV和0.58 eV),在室温下更容易激发.
- 在2H钻石中减少了杂质形成能量,这归因于其C3v对称性.
结论:
- 由于其优越的电子特性和兴奋剂特性,2H-钻石是一个有希望的理论候选人,可以取代3C-钻石作为宽带间隙材料.
- 这些发现为实现高质量的n型钻石和推进基于钻石的电子设备提供了途径.
- 这项研究为其他宽带间隙材料的不对称兴奋剂挑战提供了潜在的解决方案.
更多相关视频
09:13Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
Published on: April 1, 2017
13.6K
10:35Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
12.3K
相关概念视频
02:37Metallic Solids
18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.7K
02:37Disubstituted Cyclohexanes: cis-trans Isomerism
11.8K
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
11.8K
02:42Ionic Crystal Structures
14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
02:33Lattice Centering and Coordination Number
9.5K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Types of Unit Cells
Imagine taking a large number of identical...
9.5K