کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9868271 1530685 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Confinement effect of optical phonons in Si-Ge alloy nanocrystals
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Confinement effect of optical phonons in Si-Ge alloy nanocrystals
چکیده انگلیسی
Si1-xGex nanocrystals (nc-Si1-xGex, x=(43±1)%) with sizes of 7∼16nm were prepared using thermal crystallization of amorphous Si1-xGex alloy. Nanocrystal shape, composition, size, and phonon property were obtained in terms of high-resolution transmission electron microscope observations and X-ray diffraction and Raman spectral analyses. It was revealed that each optical vibration mode (Ge-Ge, Ge-Si, or Si-Si mode) is of evident phonon confinement effect. Using dispersion relationship in whole Brillouin zone, we numerically simulate the Raman spectra (peak position and linewidth) of nc-Ge and nc-Si and some evident characters in phonon confinement effect are presented for comparison with those of nc-Si1-xGex.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 338, Issues 3–5, 2 May 2005, Pages 379-384
نویسندگان
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