Ultrafast spectroscopy of ZnO/ZnMgO quantum wells

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/51609

Title: Ultrafast spectroscopy of ZnO/ZnMgO quantum wells
Author(s): Davis, Jeffrey A.; Jagadish, Chennupati
Abstract: We have investigated carrier relaxation and exciton recombination dynamics in ZnO/ZnMgO multiple quantum wells using femtosecond pumpprobe techniques at room temperature. For a probe energy above the band gap, the hot carriers exhibit an effective relaxation by longitudinal optical phonon scattering with a cooling time of 700850 fs. By detecting the emission near the band-gap, a longer decay time of a few picoseconds was observed which is attributed to acoustic phonon scattering. As the probe energy is decreased further, the decay time continues to increase due to the transitions of exciton recombination or localized carrier recombination.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
Source: Laser & Photonics Reviews, Vol. 3, no. 1-2 (Feb 2009), pp. 85-96
Publication year: 2009
Keyword(s): Absorption edge; Biexciton emission; Excitons; Internal electric-field; Luminescence properties; Molecular-beam epitaxy; Multiquantum wells; Quantum wells; Stark superlattices; Time-resolved photoluminescence; Ultrafast spectroscopy; Zinc oxide
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
ISSN: 1863-8880
Publisher URL: http://dx.doi.org/10.1002/lpor.200810017
Peer reviewed