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Publication Type : Journal Article
Publisher : AIP Publishing
Source : Applied Physics Letters, AIP Publishing, Volume 95, Number 20 (2009)
Campus : Coimbatore
School : Center for Industrial Research and Innovation
Center : Center for Industrial Research and Innovation (ACIRI)
Department : Nanosciences
Year : 2009
Abstract : We report the observation of nonlinear-optical response and relaxation in copper indium sulfide (CuInS2)(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.
Cite this Research Publication : N. Venkatram, Sudip Kumar Batabyal, Tian, L., Jagadese J. Vittal, and Ji, W., “Shape-dependent nonlinear absorption and relaxation in CuInS2 nanocrystals”, Applied Physics Letters, vol. 95, 2009.