X-ray investigation of quantum well intermixing after postgrowth rapid thermal processing
| العنوان: | X-ray investigation of quantum well intermixing after postgrowth rapid thermal processing |
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| المؤلفون: | Tomas Roch, Christian Pflügl, Aaron Maxwell Andrews, W. Schrenk, Gottfried Strasser |
| المصدر: | Journal of Physics D: Applied Physics. 38:A132-A136 |
| بيانات النشر: | IOP Publishing, 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Diffraction, Photoluminescence, Acoustics and Ultrasonics, Condensed matter physics, Chemistry, Superlattice, Atmospheric temperature range, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Rapid thermal processing, Diffusion (business), Quantum well, Molecular beam epitaxy |
| الوصف: | In order to better understand interdiffusion in quantum well based optoelectronic Al x Ga 1-x As/GaAs devices, we have performed rapid thermal processing on similar periodic superlattices (SLs) grown by solid source molecular beam epitaxy. The interdiffusion has been studied by x-ray diffraction measurements. The intermixing of the atoms at the barrier-well interfaces in the temperature range between 800°C and 950°C shifts the energy levels of the bound states and thus the photoluminescence wavelength of the structures. X-ray ω-2θ scans confirm Al-Ga interdiffusion at the barrier-well interfaces and are quantitatively investigated by fitting the envelope function of the SL satellites. A fit to the data yields diffusion lengths in the range 0.2-2.7 nm. Diffusion coefficients and activation energies can be derived from the temperature dependence of diffusion lengths. In the samples that exhibit rougher interfaces, the early stages of interdiffusion at up to 800°C for 1 min show the narrowing and increasing of satellite peak intensities followed by their broadening and decrease of peak maxima at higher temperatures above 850°C. The observation con-elates with the initial smoothing of the interfaces. |
| تدمد: | 1361-6463 0022-3727 |
| DOI: | 10.1088/0022-3727/38/10a/025 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::12cbe7ad5fd5e73f1a065d976e84e2aa https://doi.org/10.1088/0022-3727/38/10a/025 |
| رقم الانضمام: | edsair.doi...........12cbe7ad5fd5e73f1a065d976e84e2aa |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616463 00223727 |
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| DOI: | 10.1088/0022-3727/38/10a/025 |