Electronic Impurity Doping in CdSe Nanocrystals

被引：334

作者：

Sahu, Ayaskanta ^{[1
,2
]}

Kang, Moon Sung ^{[2
,3
]}

Kompch, Alexander ^{[4
]}

Notthoff, Christian ^{[4
]}

Wills, Andrew W. ^{[5
]}

Deng, Donna ^{[2
]}

Winterer, Markus ^{[4
]}

Frisbie, C. Daniel ^{[2
]}

Norris, David J. ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Opt Mat Engn Lab, CH-8092 Zurich, Switzerland

[2] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[3] Soongsil Univ, Dept Chem Engn, Seoul 156743, South Korea

[4] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CeNIDE, D-47057 Duisburg, Germany

[5] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 05期

基金：

美国国家科学基金会;

关键词：

Semiconductor nanocrystals; colloidal quantum dots; silver doping; photoluminescence enhancement; cation exchange; thin-film transistors; CORE/SHELL NANOCRYSTALS; QUANTUM DOTS; AG; ABSORPTION; ATOMS; STATE; DECAY; CU;

D O I：

10.1021/nl300880g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.

引用

页码：2587 / 2594

页数：8

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