探测二次波代的人工堆叠过渡金属二甲基化层中扭转控制的层间合
Yuanjian Yuan1, Peng Liu1, Hongjian Wu1
1College of Science & Hunan Key Laboratory of Extreme Matter and Applications, National University of Defense Technology, Changsha, Hunan 410073, China.
ACS nano
|September 12, 2023
概括
扭曲过渡金属二甲基化物 (TMDC) 双层中的层间合显著影响电子性能. 光学第二和生成 (SHG) 在WSe2/WSe2和WSe2/WS2中显示了取决于角度的层间合,但不是WSe2/MoS2.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 光电学是指光电子产品.
背景情况:
- 层间合对于范德瓦尔斯 (vdW) 材料和异构结构的电子带结构和光电子特性至关重要.
- 了解取决于扭转角度的间层合是设计新型VDW设备的关键.
研究的目的:
- 通过使用光学二生成 (SHG) 来研究扭曲角度对过渡金属二二二氧化物 (TMDC) 双层中层间合的影响.
- 为了区分同位基层 (WSe2/WSe2) 和异位基层 (WSe2/WS2,WSe2/MoS2) 中的层间合机制.
主要方法:
- 光学第二和生成 (SHG) 测量以探测扭转控制的层间合.
- 分析SHG强度的角度依赖,并与连贯叠加模型进行比较.
- 间层拉曼模式光谱和光发光 (PL) 光谱.
- 密度函数理论 (DFT) 计算,以了解层间距离和结合能量的变化.
主要成果:
- 在扭曲的WSe2/WSe2和WSe2/WS2双层中,SHG强度显示出高达10°的角度依赖干扰,在较低的角度显著抑制.
- 扭曲的WSe2/MoS2双层在所有堆叠角度都表现出SHG强度火,偏离标准模型.
- 发现WSe2/WSe2和WSe2/WS2的层间合是取决于角度的,但在WSe2/MoS2.2中始终存在.
- 扭曲的TMDC双层中的光发光衰减和红移证实了层间合的存在.
结论:
- 在扭曲的TMDC双层中,层间合受到堆叠角度的强烈影响,影响其光电子特性.
- WSe2/WSe2,WSe2/WS2和WSe2/MoS2的独特行为突出了不同的层间合机制.
- 堆叠角度调制的层间合是由层间距离和结合能量的变化引起的,这是DFT计算所支持的.
更多相关视频
相关概念视频
02:37Metallic Solids
18.5K
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....
18.5K
01:27Biasing of Metal-Semiconductor Junctions
279
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
279