Small-Sized PbSe/PbS Core/Shell Colloidal Quantum Dots

被引：40
|
作者：
Yanover, Diana [1 ]
Capek, Richard K. [1 ]
Rubin-Brusilovski, Anna [1 ]
Vaxenburg, Roman [1 ]
Grumbach, Nathan [1 ]
Maikov, Georgy I. [1 ]
Solomeshch, Olga [2 ,3 ]
Sashchiuk, Aldona [1 ]
Lifshitz, Efrat [1 ]
机构：
[1] Technion Israel Inst Technol, Inst Solid State, Russell Berrie Nanotechnol Inst, Schulich Fac Chem, IL-32000 Haifa, Israel
[2] Technion Israel Inst Technol, Dept Elect Engn, IL-32000 Haifa, Israel
[3] Technion Israel Inst Technol, Ctr Microelect, IL-32000 Haifa, Israel
来源：
CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 22期
基金：
以色列科学基金会;
关键词：
small-sized nanocrystals synthesis; PbSe/PbS core/shell quantum dots; surface oxidation; band-edge temperature coefficient; MULTIPLE EXCITON GENERATION; CARRIER MULTIPLICATION; ELECTRONIC-STRUCTURE; EXTINCTION COEFFICIENT; OPTICAL-PROPERTIES; LEAD SELENIDE; NANOCRYSTALS; CORE; AIR; PHOTOLUMINESCENCE;
D O I：
10.1021/cm302793k
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The work focuses on the synthesis of small-sized PbSe/PbS core/shell colloidal quantum dots with the core diameter of 2-2.5 nm and the shell thickness of 0.5-1.0 nm. The PbSe/PbS core/shell CQDs are chemically stable under time-limited air exposure and have emission quantum efficiency of 60% at room temperature. The PbSe/PbS core/shell CQDs have a tunable absorption edge around 1 mu m, large exciton emission Stokes shift (similar to 150 meV), and small exchange interaction (similar to 1.5 meV). Theoretical calculations associate the mentioned parameters to the small-size regime as well as to a lift of band-edge degeneracy due to slight shape anisotropy. The specific parameters are of special interest in photovoltaic applications.
引用
收藏
页码：4417 / 4423
页数：7
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