1.
Phys Rev Lett
; 97(26): 266103, 2006 Dec 31.
Article
in English
| MEDLINE
| ID: mdl-17280432
ABSTRACT
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.