| Stable Temperature Characteristics of InAs／GaAs Quantum Dots at Long Wavelength Emission |
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| 作者姓名： | KONGLing-min CAIJia-fa WUZheng-yun GONGZheng NIUZhi-chuan |
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| 作者单位： | [1]Dept.ofPhys.,XiamenUniversity,Xiamen361005,CHN [2]NationalLab.forSuperlatticeandMicrostructures,InstituteofSemicondutors,CASs,Beijing100083,CHN |
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| 摘 要： | The time-resolved photoluminescence and steady photoluminescence (TRPL and PL) spectra on self-assembled InAs/GaAs quantum dots (QDs) are investigated. By depositing GaAs/InAs short period superlattices (SLs), 1. 48μm emission is obtained at room temperature. Temperature dependent PL measurements show that the PL intensity of the emission is very steady. It decays only to half as the temperature increases from 15 K to room temperature, while at the same time, the intensity of the other emission decreases by a factor of 5 orders of magnitude. These two emissions are attributed to large-size QDs and short period superlattices (SLs), respectively. Large-size QDs are easier to capture and confine carriers, which benefits the lifetime of PL, and therefore makes the emission intensity insensitive to the temperature.
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| 关 键 词： | InAs／GaAs 量子点 长波长发射 载波传输 时间分辨光谱 |
| 收稿时间： | 2004/9/18 |
Stable Temperature Characteristics of InAs/GaAs Quantum Dots at Long Wavelength Emission |
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| KONGLing-min CAIJia-fa WUZheng-yun GONGZheng NIUZhi-chuan.Stable Temperature Characteristics of InAs/GaAs Quantum Dots at Long Wavelength Emission[J].Semiconductor Photonics and Technology,2005,11(2):78-80,115. |
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| Authors: | KONG Ling-min CAI Jia-fa WU Zheng-yun GONG Zheng NIU Zhi-chuan |
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| Abstract: | The time-resolved photoluminescence and steady photoluminescence (TRPL and PL) spectra on self-assembled InAs/GaAs quantum dots (QDs) are investigated. By depositing GaAs/InAs short period superlattices (SLs), 1. 48 μtm emission is obtained at room temperature. Temperature dependent PL measurements show that the PL intensity of the emission is very steady. It decays only to half as the temperature increases from 15 K to room temperature, while at the same time, the intensity of the other emission decreases by a factor of 5 orders of magnitude. These two emissions are attributed to large-size QDs and short period superlattices (SLs), respectively. Large-size QDs are easier to capture and confine carriers,which benefits the lifetime of PL, and therefore makes the emission intensity insensitive to the temperature. |
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| Keywords: | InAs/GaAs quantum dots Time-resolved spectra Carrier transportation |
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