Thermally-activated effects on photoluminescence line shape of InAs/GaAs quantum dot heterosystems
| Autor: | Tzer-En Nee, Ya-Fen Wu, Yeu-Jent Hu, Jia-Hui Fang, Jiunn-Chyi Lee, Hui-Tang Shen, Jen-Cheng Wang |
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| Rok vydání: | 2007 |
| Předmět: |
Photoluminescence
Condensed matter physics Chemistry Scattering Exciton Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Laser linewidth Quantum dot Quantum dot laser Thermal Instrumentation |
| Zdroj: | The European Physical Journal Applied Physics. 38:21-25 |
| ISSN: | 1286-0050 1286-0042 |
| DOI: | 10.1051/epjap:2007037 |
| Popis: | We investigate the temperature dependence of photoluminescence (PL) properties of InAs/GaAs quantum dot (QD) heterostructures. The temperature dependence of the InAs exciton energy and linewidth is found to display a significant difference due to the different dot size distribution. We propose a model, which takes into account the dot size distribution, state filling effect, carrier thermal escaping and retrapping, and electron-phonon scattering, to explain the carriers transferring mechanisms in the QD system. The experimental results are reproduced well by our model. Sample with lower dot size uniformity reveals evident thermal redistribution effect among dots, but the effect is weak for sample with higher dot size uniformity and is overcome by the electron-phonon scattering, which is consistent with the observed monotonically increasing linewidth of PL spectra with temperature. |
| Databáze: | OpenAIRE |
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