Auger Recombination Suppression in Nanocrystals with Asymmetric Electron-Hole Confinement

被引：68

作者：

Climente, Juan I. ^{[1
]}

Movilla, Jose L. ^{[1
]}

Planelles, Josep ^{[1
]}

机构：

[1] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12080, Spain

来源：

SMALL | 2012年 / 8卷 / 05期

关键词：

Auger recombination; blinking; core; shell materials; nanocrystalline materials; quantum dots; SINGLE-QUANTUM-DOT; SEMICONDUCTOR NANOCRYSTALS; BLINKING SUPPRESSION; DYNAMICS;

D O I：

10.1002/smll.201101740

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Type II and quasi-type II nanocrystals with thick shells exhibit reduced blinking. However, after a number of monolayers, the influence of the shell thickness is found to vanish. Using a two-band Kane Hamiltonian, it is shown that this behavior is a consequence of interband coupling and asymmetric confinement of electrons and holes. Interface alloying provides an additional, order-of-magnitude contribution to the Auger suppression, in agreement with recent experiments. The existence is predicted of critical shell thicknesses that strongly quench Auger processes for any core size.

引用

页码：754 / 759

页数：6

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