کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1810443 1025563 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of the radiative lifetime in core–shell CdSe/ZnS and CdSe/ZnSe quantum dots
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Investigation of the radiative lifetime in core–shell CdSe/ZnS and CdSe/ZnSe quantum dots
چکیده انگلیسی

Using the one band effective mass approximation model we computed the optical properties of the spherical shaped CdSe/ZnS and Cdse/ZnSe core–shell quantum dot (CSQD). For each structure we calculated the charge carrier energies and corresponding wave functions. We investigated the dependence of the carrier energies on various parameters of the CSQD, including its size. Then we calculated the radiative recombination lifetime for the two types of CSQDs nanocrystals. We found that as the size of the dot is increased the optical gap of CSQD is reduced, resulting in a reduction in electron energies and an increase in hole energies. We have shown that the radiative recombination lifetime in the CdSe/ZnS and CdSe/ZnSe CSQDs decreased by increasing the shell thickness around the core of the QD. We also showed that the radiative lifetime in the CdSe/ZnS is less than that in the CdSe/ZnSe CSQDs and is sensitive to the size and nature of shell of the semiconductor's material.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 407, Issue 17, 1 September 2012, Pages 3313–3319
نویسندگان
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