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解开魔法大小半导体纳米晶体的生长机制

Aniket S Mule¹, Sergio Mazzotti¹, Aurelio A Rossinelli¹

¹Optical Materials Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.

Journal of the American Chemical Society

|January 20, 2021

概括

半导体的魔法大小集群 (MSC) 逐层增长,保留了四面体形状,解释了它们的独特稳定性和离散大小演变为更大的纳米晶体.

科学领域:

纳米技术
材料科学
固态化学

背景情况:

魔法大小集群 (MSC) 是半导体原子排列,以增强的稳定性和离散增长而闻名.
在MSC稳定性和增长背后的精确机制,尤其是体量子点大小,仍然不太清楚.

研究的目的:

解开魔法大小集群 (MSC) 的生长机制,包括更大的CdSe纳米晶体.
解释在MSC中观察到的离散增长和增强的稳定性.

主要方法:

开发了一种合成协议, 产生九个离散的CdSe纳米晶体.
采用经典核化理论来模拟动力障碍和纳米晶体的生长.
在表面反应有限的条件下研究了晶体形状和层次增长的作用.

主要成果:

证明MSC是四面体形状的混合晶体.
表明将单层添加到四个相同的面部可以保持四面体形状,从而产生离散的尺寸.
确定了表面反应有限的条件和与半导体纳米板块生长的相似性.

结论:

四面体混合晶体的层次增长解释了MSC的特殊稳定性和离散大小.
这些发现提供了对CdSe和可能其他半导体的MSC增长的基本理解.
这种机制为在扩展的尺寸范围内合成几乎单分散的纳米晶体提供了一种新方法.

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