| Original Articles |
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Broadening of Photoluminescence by Nonhomogeneous Size Distribution of Self-Assembled InAs Quantum Dots |
YANG Xi-Feng, LIU Zhao-Lin, CHEN Ping-Ping, CHEN Xiao-Shuang, LI Tian-Xin,
LU Wei |
| National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083 |
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| Cite this article: |
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YANG Xi-Feng, LIU Zhao-Lin, CHEN Ping-Ping et al 2008 Chin. Phys. Lett. 25 3059-3062 |
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Abstract The photoluminescence spectrum (PL) of InAs quantum dots (QDs) at 80K is studied by comparison between the theoretical calculation and experimental measurement. The Gaussian line shape is used to approximate the size distribution of QDs. Its mean volume and the standard size deviation are well correlated with the peak and full width at half maximum (FWHM) of the PL spectrum. The experimental PL spectrum is well reproduced by the theoretical model based on the effect mass approximation including the size distribution without any adjustable parameters. Compared with the standard size deviation value σs=9×10-2 determined by atomic force microscopic method a small value σs=7×10-2 is obtained by the best fitting process from the measured and calculated PL spectra
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| Keywords:
78.67.Hc
73.21.La
73.22.-f
71.15.-m
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Received: 10 April 2008
Published: 25 July 2008
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| PACS: |
78.67.Hc
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(Quantum dots)
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73.21.La
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(Quantum dots)
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73.22.-f
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(Electronic structure of nanoscale materials and related systems)
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71.15.-m
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(Methods of electronic structure calculations)
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