Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4894513
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Funding
- Materials World Network, National Science Foundation [DMR-09007090, DMR-1210282]
- NDF [EPMD 1128489]
- GANEX [ANR-11-LABX-0014]
- international ANR GASIOPHE
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1210282, 907096] Funding Source: National Science Foundation
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Optical properties of GaN/Al0.2Ga0.8N multiple quantum wells grown with semi-polar (10-11) orientation on patterned 7 degrees-off Si (001) substrates have been investigated. Studies performed at 8 K reveal the in-plane anisotropic behavior of the QW photoluminescence (PL) intensity for this semipolar orientation. The time resolved PL measurements were carried out in the temperature range from 8 to 295 K to deduce the effective recombination decay times, with respective radiative and non-radiative contributions. The non-radiative component remains relatively weak with increasing temperature, indicative of high crystalline quality. The radiative decay time is a consequence of contribution from both localized and free excitons. We report an effective density of interfacial defects of 2.3 x 10(12) cm(-2) and a radiative recombination time of tau(loc) = 355 ps for the localized excitons. This latter value is significantly larger than those reported for the non-polar structures, which we attribute to the presence of a weak residual electric field in the semi-polar QW layers. (c) 2014 AIP Publishing LLC.
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