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题名: Structural and optical properties of InAlGaN films grown directly on low-temperature buffer layer with (0001)sapphire substrate
作者: Li DB;  Dong X;  Huang JS;  Liu XL;  Xu ZY;  Wang XH;  Zhang Z;  Wang ZG
发表日期: 2003
摘要: Quaternary InAlGaN film has been grown directly on top of low-temperature-deposited GaN buffer layer by low-pressure metalorganic vapor phase epitaxy. High-resolution X-ray diffraction and photoluminescence (PL) results show that the film has good crystal quality and optical property. Temperature-dependent PL and time-resolved PL (TRPL) have been employed to study the carriers recombination dynamics in the film. The TRPL signals can be well fitted as a stretched exponential function exp[-(t/tau)(beta)] from 14 to 250 K, indicating that the emission is attributed to the radiative recombination of excitons localized in disorder quantum nanostructures such as quantum disks originating from indium (In) clusters or In composition fluctuation. The cross-sectional high-resolution electron microscopy measurement further proves that there exist the disorder quantum nanostructures in the quaternary. By investigating the dependence of the exponential parameter beta on the temperature, it is shown that the multiple trapping-detrapping mechanism dominates the diffusion among the localized states. The localized states are considered to have two-dimensional density of states (DOS) at 250 K, since radiative recombination lifetime tau(r) increases linearly with increasing temperature. (C) 2002 Elsevier Science B.V. All rights reserved.
KOS主题词: Nanostructured materials;  Metal organic chemical vapor deposition;  Nitrides;  Deterioration;  Luminescence;  Aluminum oxide;  Heraldry;  Silicon
刊名: JOURNAL OF CRYSTAL GROWTH
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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Li DB; Dong X; Huang JS; Liu XL; Xu ZY; Wang XH; Zhang Z; Wang ZG .Structural and optical properties of InAlGaN films grown directly on low-temperature buffer layer with (0001)sapphire substrate ,JOURNAL OF CRYSTAL GROWTH,2003 ,249 (1-2):72-77
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