Effects of quantum confinement and shape on band gap of core/shell quantum dots and nanowires

被引：20

作者：

Gao, Faming ^{[1
]}

机构：

[1] Yanshan Univ, Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 19期

基金：

高等学校博士学科点专项科研基金; 中国国家自然科学基金;

关键词：

NANOCRYSTALS; INP;

D O I：

10.1063/1.3590253

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A quantum confinement model for nanocrystals developed is extended to study for the optical gap shifts in core/shell quantum dots and nanowires. The chemical bond properties and gap shifts in the InP/ZnS, CdSe/CdS, CdSe/ZnS, and CdTe/ZnS core/shell quantum dots are calculated in detail. The calculated band gaps are in excellent agreement with experimental values. The effects of structural taping and twinning on quantum confinement of InP and Si nanowires are elucidated. It is found theoretically that a competition between the positive Kubo energy-gap shift and the negative surface energy shift plays the crucial role in the optical gaps of these nanosystems. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3590253]

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