| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Influence of Rapid Thermal Annealing on Carrier Dynamics in GaInNAs/GaAs Multiple Quantum Wells |
| ZHOU Wei**, YANG Jie, XIA Su-Jing, LI Xiang, TANG Wu
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State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054
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ZHOU Wei, YANG Jie, XIA Su-Jing et al 2011 Chin. Phys. Lett. 28 117801 |
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Abstract The excitation intensity and time-resolved photoluminescence spectroscopy are used to investigate the impact of annealing on the carrier dynamics in the Ga0.66In0.34N0.013As0.987/GaAs multiple quantum well structure grown by metalorganic chemical vapor deposition. The measurement of excitation intensity photoluminescence (PL), performed for as-grown and annealed samples at different temperatures, indicates that the localized potential has come down slightly after annealing but does not alter the fact that PL emission at low temperature is dominated by localized exciton recombination. In contrast, free carrier recombination is magnified by post-grown annealing at room temperature. Our results show that the decay times are 0.587 and 0.327 ns at 10 K for the as-grown and annealed samples, and radiative decay times also shorten significantly after annealing at all temperatures. Hence the improvement of luminescence efficiency after annealing is caused by the reduction of localization and enhancement of radiative recombination rate. The reduction of the density of nonradiative centers is demonstrated indirectly after annealing.
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| Keywords:
78.67.De
78.47.Jg
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Received: 14 August 2011
Published: 30 October 2011
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