Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes

被引：214

作者：

Balet, LP ^{[1
]}

Ivanov, SA ^{[1
]}

Piryatinski, A ^{[1
]}

Achermann, M ^{[1
]}

Klimov, VI ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

NANO LETTERS | 2004年 / 4卷 / 08期

关键词：

D O I：

10.1021/nl049146c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study inverted core/shell nanocrystals (NCs) in which a core of a wide gap semiconductor (ZnSe) is overcoated with a shell of a semiconductor of a narrower gap (CdSe). By monitoring radiative recombination lifetimes for a series of these NCs with a fixed core radius and progressively increasing shell thickness, we observe a continuous transition from Type-I (both electron and hole wave functions are distributed over the entire NC) to Type-II (electron and hole are spatially separated between the shell and the core) and back to Type-I (both electron and hole primarily reside in the shell) localization regimes. These observations are in good agreement with the calculated dependence of the electron-hole overlap integral on shell thickness.

引用

页码：1485 / 1488

页数：4

共 12 条

[1] Macroscopically ordered state in an exciton system [J].