کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1544385 1512886 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical absorption coefficients in a CdSe/Pb1−xCdxSe/CdSe spherical quantum dot quantum well nanostructure
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Optical absorption coefficients in a CdSe/Pb1−xCdxSe/CdSe spherical quantum dot quantum well nanostructure
چکیده انگلیسی


• Some optical properties are discussed in a spherical quantum dot-quantum well nanostructure.
• The core and shell are taken as the same material.
• The variation of optical transition energy with the dot radius of well-dot is brought out.
• Oscillator strength as a function of photon energy is investigated with the dielectric mismatch.

Exciton binding energies, optical transition energies and the absorption coefficients are investigated taking into consideration geometrical confinement, dielectric mismatch and the self-polarization potential in a CdSe/Pb1−xCdxSe/CdSe spherical quantum dot-quantum well nanostructure. The core and shell are taken as the same material. The exciton binding energy and the interband emission energy have been found using a variational method within the single band effective mass approximation. The binding energies of the exciton as a function of dot radius of the well dot with the different dot radii and the dielectric constants of the core and shell materials are studied. The variation of optical transition energy with the dot radius of well-dot is brought out. The oscillator strength and the radiative transition lifetime as a function of photon energy are investigated with the dielectric mismatch.

Variation of oscillator strength as a function of well-dot radius in a CdSe/Pb1-xCdxSe/CdSe quantum dot quantum well nanostructure for various Cd alloy content in the core and shell materials is shown in the figure. It is shown that the oscillator strength is more influenced by the dielectric mismatch.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 63, September 2014, Pages 337–342
نویسندگان
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