调整CsPbBr3纳米晶体的体软度,以实现同质的超级网格
Shai Levy1, Orr Be'er1, Noam Veber1,2
1Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Nano letters
|July 20, 2023
概括
佩罗夫斯基特纳米晶超级晶体由于结构变化而表现出光谱变化. 控制构建块的控制.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 光电学是指光电子产品.
背景情况:
- 矿纳米晶超 (NC SLs) 是由数百万个有序的纳米晶组成的先进材料.
- 这些有序结构表现出集体光电子现象,但它们的性能对结构和光谱不均性敏感.
- 了解这些异质性对于优化NC SL属性至关重要.
研究的目的:
- 研究CsPbBr3NC SLs中的结构性和光谱性之间的关系.
- 以高空间分辨率探测阴极光发光 (CL) 特性.
- 确定导致超级格子内的排放转移的因素.
主要方法:
- 使用扫描电子显微镜 (SEM) 使用自由电子激发阴极光发光 (CL).
- 采用超光谱的CL映射来同时表征结构和光谱异质性.
- 相关的CL-SEM测量实现了大约20nm的空间分辨率.
主要成果:
- 在单个CsPbBr3NC SL中确定了多极发射域.
- 与中心域相比,在SL边缘 (高达65 meV) 观察到蓝移排放.
- 发现了NC构建块的体软度和CL移位的程度之间的相关性.
结论:
- 剩余的单轴压缩应变有助于在NC SL中观察到的排放转移.
- NC构建块的体软度是工程NC SLs的一个关键参数.
- 对NC构建块属性的精确控制对于先进的超级网格设计至关重要.
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