Sizing up the exciton in complex-shaped semiconductor nanocrystals

被引：25

作者：

Kim, Jeongho ^{[1
]}

Nair, P. Sreekumari ^{[1
]}

Wong, Cathy Y. ^{[1
]}

Scholes, Gregory D. ^{[1
]}

机构：

[1] Univ Toronto, Ctr Quantum Informat & Quantum Contorl, Inst Opt Sci, Dept Chem, Toronto, ON M5S 3H6, Canada

来源：

NANO LETTERS | 2007年 / 7卷 / 12期

关键词：

D O I：

10.1021/nl072149f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

we report a spectroscopic study of how nanocrystal shape influences exciton size. The effective exciton size in complex-shaped nanocrystals is examined by comparing exciton fine structure relaxation rates, measured by the ultrafast polarization transient grating method, to an extensive empirical calibration curve that relates the relaxation rates of quantum dots and nanorods to their diameters. It is found that the overall nanocrystal shape is important for determining the effective exciton size in nanocrystals. How nanocrystal shape plays a role in quantum confinement and therefore exciton shape is qualitatively discussed based on these experimental results.

引用

页码：3884 / 3890

页数：7

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