Oswald ripening and shape transitions of self-assembled PbSe quantum dots on PbTe (111) during annealing
Oswald ripening and shape transitions of self-assembled PbSe quantum dots on PbTe (111) during annealing
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PbTe（111）上自组装 PbSe 量子点退火过程中的 Oswald 熟化和形状转变
DOI：
10.1063/1.1323733
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发表时间：
2000
影响因子：
4
通讯作者：
G. Springholz
中科院分区：
文献类型：
--
作者：
A. Raab;G. Springholz
研究了多面自组装 PbSe 量子点在退火过程中的热稳定性。随着退火时间的增加，点密度迅速降低，同时平均岛体积增加。此外，对于超过 160 A 临界高度的岛，观察到从金字塔岛到截头金字塔的形状转变。岛体积和密度的演变与界面反应限制传质导致的奥斯瓦尔德成熟一致。这清楚地表明，生长的岛屿并不代表平衡结构，并且它们狭窄的尺寸分散是纯粹的动力学效应。
The thermal stability of faceted self-assembled PbSe quantum dots during annealing is investigated. With increasing annealing time, the dot density is found to decrease rapidly with a simultaneous increase of the average island volumes. In addition, a shape transition from pyramidal islands to truncated pyramids is observed for islands exceeding a critical height of 160 A. The evolution of island volumes and densities is consistent with Oswald ripening by interface-reaction-limited mass transfer. This is a clear indication that the as-grown islands do not represent an equilibrium structure and that their narrow size dispersion is a purely kinetic effect.