کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8149709 | 1524404 | 2015 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Suppression of photoluminescence from wetting layer of InAs quantum dots grown on (311)B GaAs with AlAs cap
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Self-assembled InAs quantum dots (QDs), without and with an AlAs cap, were grown on (311)B GaAs substrates by molecular beam epitaxy. Surface morphologies of QDs were characterized by atomic force microscopy. Photoluminescence (PL) was performed in the 4-300Â K temperature range. For QDs without AlAs cap, sharp and intense PL emitted from wetting layer was observed. PL from QDs was relatively weak at 4Â K. The PL intensity of QDs decreased as measurement temperature increased and was not observed at 300Â K. For QDs with AlAs cap, PL from WL vanished while PL from QDs were substantially enhanced at 300Â K. Suppression of PL from WL indicates that the thickness of WL was reduced due to phase separation result from AlAs cap, which is an effective way to improve the PL of InAs QDs grown on (311)B GaAs substrate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 425, 1 September 2015, Pages 106-109
Journal: Journal of Crystal Growth - Volume 425, 1 September 2015, Pages 106-109
نویسندگان
X.M. Lu, S. Matsubara, Y. Nakagawa, T. Kitada, T. Isu,