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Shape-dependent nonlinear absorption and relaxation in CuInS2 nanocrystals

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Abstract
We report the observation of nonlinear-optical response and relaxation in copper indium sulfide (CuInS2) crystalline nanoparticles and nanorods with femtosecond Z-scans and transient absorption measurements. Dependent on the size and shape, two-photon absorption and saturation in the one-photon absorption manifest themselves in these measurements as laser excitation wavelength of 780 nm is in the proximity of the lowest-lying excitonic energy, particularly for the nanorods. The transient absorption measurements by both one-photon and two-photon excitation reveal that electron-hole recombination is faster in smaller nanoparticles, or in nanorods with smaller aspect ratio. However, the decay to trapping states is independent of the size and aspect-ratio. © 2009 American Institute of Physics.
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Source Title
Applied Physics Letters
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Series/Report No.
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Organizational Unit
PHYSICS
dept
Organizational Unit
CHEMISTRY
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Date
2009
DOI
10.1063/1.3266518
Type
Article
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