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Volumn 84, Issue 15, 2011, Pages

Exciton recombination dynamics in an ensemble of (In,Al)As/AlAs quantum dots with indirect band-gap and type-I band alignment

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EID: 80455178812     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.84.155318     Document Type: Article
Times cited : (46)

References (32)
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    • The recombination energy of an exciton in a QD is determined by the QD size, while photons at a certain spectral energy are contributed by QDs with similar sizes. Thus the PL band maximum corresponds to recombination in QDs with the size given by the average QD diameter. In Ref. we calculated confined energy levels of QDs with different diameters as functions of the QD composition. The comparison of the measured energy of the PL maximum with the calculated optical transition energies in QDs with known average sizes allows us to determine the average composition of these QDs. The InAs fraction in the (In, Al)As QDs as a function of the substrate temperature and the growth-interruption time is given in Ref.
    • The recombination energy of an exciton in a QD is determined by the QD size, while photons at a certain spectral energy are contributed by QDs with similar sizes. Thus the PL band maximum corresponds to recombination in QDs with the size given by the average QD diameter. In Ref. we calculated confined energy levels of QDs with different diameters as functions of the QD composition. The comparison of the measured energy of the PL maximum with the calculated optical transition energies in QDs with known average sizes allows us to determine the average composition of these QDs. The InAs fraction in the (In, Al)As QDs as a function of the substrate temperature and the growth-interruption time is given in Ref.
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    • The long exciton lifetimes in the (In, Al)As/AlAs QDs evidence that carriers captured in QDs recombine through photon emission only. Actually, we have demonstrated in Ref. that even a small fraction of QDs containing nonradiative centers of 5% would only decrease the PL decay time down to about 1 μs due to the long-distance transfer of the exciton energy to the nonradiative centers
    • The long exciton lifetimes in the (In, Al)As/AlAs QDs evidence that carriers captured in QDs recombine through photon emission only. Actually, we have demonstrated in Ref. that even a small fraction of QDs containing nonradiative centers of 5% would only decrease the PL decay time down to about 1 μs due to the long-distance transfer of the exciton energy to the nonradiative centers.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.