在二维半导体中通过介电环境工程进行刺激操纵
Raziel Itzhak1,2, Nathan Suleymanov1, Boris Minkovich1
1Department of Electrical and Computer Engineering, Technion, Haifa 32000, Israel.
概括
像WS2和WSe2这样的二维 (2D) 半导体在不同的介电上显示可调光发光 (PL). 悬浮这些材料增强了PL,为先进的CMOS兼容光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
- 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:
- 二维 (2D) 半导体为光子应用提供独特的光电子特性.
- 介电环境显著影响过渡金属二甲基化物 (TMD) 单层的光发光 (PL) 光谱.
- 兴奋剂和电荷载体度通过刺激效应进一步调节PL光谱.
研究的目的:
- 调查基板诱导的介电选对二维半导体的影响.
- 分析兴奋剂和被困电荷对PL光谱的影响.
- 探索用于CMOS集成的2D材料中增强PL强度和控制排放的方法.
主要方法:
- 1L-WS2和1L-WSe2.2的化学蒸气沉积 (CVD) 的增长.
- 将二维材料转移到SiO2和HfO2介电材料上.
- 光发光 (PL) 光谱和微PL测量.
- 纳米级悬浮技术.
主要成果:
- 在HfO2上的p型1L-WSe2显示了增强的PL强度和红移的三离子辐射.
- 在类似的介电材料上,n型1L-WS2表现出蓝色转移,较低强度的PL.
- 介电选,兴奋剂和载体度的相互作用决定了光谱变化.
- 纳米级悬浮物通过减少非辐射重组,显著提高了PL.
结论:
- 基质选择和材料注对二维半导体PL产生了重大影响.
- 纳米级悬浮是一种可行的策略,可以增强用于设备应用的PL.
- 这些发现对于开发下一代CMOS兼容光电子设备至关重要.
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