Multiexcitons confined within a subexcitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals

被引:192
作者
Achermann, M [1 ]
Hollingsworth, JA [1 ]
Klimov, VI [1 ]
机构
[1] Los Alamos Natl Lab, Div Chem, C PCS, Los Alamos, NM 87545 USA
来源
PHYSICAL REVIEW B | 2003年 / 68卷 / 24期
关键词
D O I
10.1103/PhysRevB.68.245302
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The use of ultrafast gating techniques allows us to resolve both spectrally and temporally the emission from short-lived neutral and negatively charged biexcitons in ultrasmall (sub-10 nm) CdSe nanocrystals (nanocrystal quantum dots). Because of "forced" overlap of electronic wave functions and reduced dielectric screening, these states are characterized by giant interaction energies of tens (neutral biexcitons) to hundreds (charged biexcitons) of meV. Both types of biexcitons show extremely short lifetimes (from sub-100 picoseconds to sub-picosecond time scales) that rapidly shorten with decreasing nanocrystal size. These ultrafast relaxation dynamics are explained in terms of highly efficient nonradiative Auger recombination.
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页数:5
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