کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7933968 | 1512864 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects of strain and spacer layer in CdSe/CdS/ZnS and CdSe/ZnS/CdS core/shell quantum dots
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
The effects of lattice mismatch induced interface strain on the structural, optical and dielectric properties of CdSe based Cd(Zn)S shell and Cd(Zn)S/Zn(Cd)S multishell quantum dots (QDs) is studied. Introducing Zn(Cd)S spacer layer to the CdSe/Cd(Zn)S core/shell structure is found to influence induced interfacial strain through changing the lattice parameter, band gap and band offset of core/shell nanostructure. Lattice parameter of spacer layer affected by outer shell, changes the interface strain in the core region. Theoretically obtained strain in the core/shell(multishell) is used in the effective mass approximation (EMA) to determine the capped core diameter. We show that introducing ZnS spacer layer to the CdSe/CdS core/shell QDs rises the amount of strain and cause more decrease in the core size in CdSe/ZnS/CdS. Furthermore, CdS sandwiched between CdSe/ZnS decreases the amount of strain in crystal and suppresses the size decrease of the core in the CdSe/ZnS. Good agreement is found between the strain included EMA core size predictions in core/shell and multishell and observed size image from transmission electron microscopy (TEM) measurements of bare CdSe core nanocrystals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 85, January 2017, Pages 334-339
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 85, January 2017, Pages 334-339
نویسندگان
Hadi S. Pisheh, Negar Gheshlaghi, Hilmi Ãnlü,