Size-Dependent Optical Properties of Zinc Blende Cadmium Telluride Quantum Dots

被引:56
作者
Kamal, John Sundar [1 ]
Omari, Abdoulghafar [1 ]
Van Hoecke, Karen [2 ]
Zhao, Qiang [3 ]
Vantomme, Andre [3 ]
Vanhaecke, Frank [2 ]
Capek, Richard Karel
Hens, Zeger [1 ]
机构
[1] Univ Ghent, Ctr Nano & Biophoton, B-9000 Ghent, Belgium
[2] Univ Ghent, Dept Analyt Chem, B-9000 Ghent, Belgium
[3] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium
关键词
ABSORPTION CROSS-SECTION; CDTE NANOCRYSTALS; SEMICONDUCTOR NANOCRYSTALS; EXTINCTION COEFFICIENT; COLLOIDAL NANOCRYSTALS; SURFACE STOICHIOMETRY; CDS NANOCRYSTALS; HETEROSTRUCTURES; CONFINEMENT; EXCITON;
D O I
10.1021/jp212281m
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
We analyze the optical properties of CdTe quantum dots, including the sizing curve, the absorption coefficient, and the oscillator strength of the band gap transition, by combining absorption spectroscopy, elemental analysis, and electron microscopy imaging. At short wavelengths, the absorption coefficient spectrum is still affected by quantum confinement, yet a largely constant value, close to that of bulk CdTe, is found at around 410 nm. At shorter wavelengths, remaining quantum confinement effects on the CdTe E-1 transition are present even for the largest quantum dots studied (11 nm). For the band gap transition, we find an integrated absorption coefficient mu(gap) that scales almost proportionally to the inverse of the quantum dot volume. Especially for the smaller diameters, deviations up to a factor of 3 are found as compared to widely used literature values. The corresponding oscillator strength f(gap) is almost size-independent in the diameter range 3-7 nm. The correspondence between radiative lifetimes predicted based on f(gap) and literature values is discussed.
引用
收藏
页码:5049 / 5054
页数:6
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