Confined-but-Connected Quantum Solids via Controlled Ligand Displacement

被引：170

作者：

Baumgardner, William J. ^{[1
]}

Whitham, Kevin ^{[2
]}

Hanrath, Tobias ^{[3
]}

机构：

[1] Cornell Univ, Dept Chem & Chem Biol, Ithaca, NY 14850 USA

[2] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14850 USA

[3] Cornell Univ, Sch Chem & Biomol Engn, Ithaca, NY 14850 USA

来源：

NANO LETTERS | 2013年 / 13卷 / 07期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

Quantum dots; ligand displacement; nonsolvent; coupling; PbSe; charge transport; PBSE NANOCRYSTAL SOLIDS; LIGHT-EMITTING-DIODES; SEMICONDUCTOR NANOCRYSTALS; COLLOIDAL NANOCRYSTALS; ELECTRICAL-PROPERTIES; SIZE; TRANSFORMATIONS; PHOTOVOLTAICS; CONDUCTION; DEPENDENCE;

D O I：

10.1021/nl401298s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Confined-but-connected quantum dot solids (QDS) combine the advantages of tunable, quantum-confined energy levels with efficient charge transport through enhanced electronic interdot coupling. We report the fabrication of QDS by treating self-assembled films of colloidal PbSe quantum dots with polar nonsolvents. Treatment with dimethylformamide balances the rates of self-assembly and ligand displacement to yield confined-but-connected QDS structures with cubic ordering and quasi-epitaxial interdot connections through facets of neighboring dots. The QDS structure was analyzed by a combination of transmission electron microscopy and wide-angle and small-angle X-ray scattering. Excitonic absorption signatures in optical spectroscopy confirm that quantum confinement is preserved. Transport measurements show significantly enhanced conductivity in treated films

引用

页码：3225 / 3231

页数：7

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