کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1786500 1023417 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exciton binding energy and the optical absorption coefficient in a strained CdxZn1−xO/ZnO quantum dot
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Exciton binding energy and the optical absorption coefficient in a strained CdxZn1−xO/ZnO quantum dot
چکیده انگلیسی

Numerical calculations of the excitonic absorption spectra in a strained CdxZn1−xO/ZnO quantum dot are investigated for various Cd contents. We calculate the quantized energies of the exciton as a function of dot radius for various confinement potentials and thereby the interband emission energy is computed considering the internal electric field induced by the spontaneous and piezoelectric polarizations. The optical absorption as a function of photon energy for different dot radii is discussed. Decrease of exciton binding energy and the corresponding optical band gap with the Cd concentration imply that the confinement of carriers decreases with composition x. The main results show that the confined energies and the transition energies between the excited levels are significant for smaller dots. Non-linearity band gap with the increase in Cd content is observed for smaller dots in the strong confinement region and the magnitude of the absorption spectra increases for the transitions between the higher excited levels.


► Excitonic absorption spectra in a strained CdxZn1−xO/ZnO quantum dot are investigated for various Cd contents.
► We calculate the quantized energies of the exciton as a function of dot radius for various confinement potentials.
► The interband emission energy is computed considering the internal electric field.
► The optical absorption as a function of photon energy for different dot radii is discussed.
► The main results show that the transition energies between the excited levels are significant for smaller dots.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 13, Issue 2, March 2013, Pages 390–395
نویسندگان
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