Surface exchange and shape transitions of PbSe quantum dots during overgrowth

被引：12
作者：
Abtin, L.
Springholz, G. [1 ]
Holy, V.
机构：
[1] Johannes Kepler Univ, Inst Halbleiter & Festkorperphys, A-4040 Linz, Austria
[2] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 26期
基金：
奥地利科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.97.266103
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Epitaxial overgrowth of PbSe quantum dots is shown to drastically affect their shape and composition due to anion exchange reactions. As shown by scanning tunneling microscopy, for PbTe capping layers this results in a complete truncation of the dots. Introduction of EuTe into the cap layer leads to an effective suppression of the anion exchange process. This preserves the original dot pyramids and induces a large stress concentration on the surface which further alters the overgrowth process.
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页数：4
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