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Recombination dynamics and screening of the internal electric field in ZnO/Zn x Mg 1-x O multiple quantum wells

Hall, C R; Dao, Lap Van; Koike, Kazuto; Sasa, Shigehiko; Tan, Hoe Hark; Inoue, Masataka; Yano, Mitsuaki; Hannaford, Peter; Jagadish, Chennupati; Davis, Jeff A


We investigate the recombination dynamics within screened c -axis ZnO/ Zn0.7 Mg0.3 O quantum wells using time-resolved photoluminescence and femtosecond pump-probe spectroscopy. The relaxation of excited carriers restores the strength of the internal electric field, which we follow, via the decay time constant, as it increases from 180 ns to 5.8,μs. Pump-probe spectroscopy reveals faster, initial decay times of 160-250 ps, which we attribute to additional recombination mechanisms, that become...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Physical Review B: Condensed Matter and Materials
DOI: 10.1103/PhysRevB.80.235316


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