Band Alignment Tuning in Twin-Plane Superlattices of Semiconductor Nanowires

被引：36

作者：

Akiyama, Toru ^{[1
]}

Yamashita, Tomoki ^{[1
]}

Nakamura, Kohji ^{[1
]}

Ito, Tomonori ^{[1
]}

机构：

[1] Mie Univ, Dept Engn Phys, Tsu, Mie 5148507, Japan

来源：

NANO LETTERS | 2010年 / 10卷 / 11期

基金：

日本学术振兴会;

关键词：

Nanowire; twin-plane superlattices; band alingment; density functional calculations; ZINC-BLENDE POLYTYPISM; OPTICAL-PROPERTIES; GROWTH; GAAS;

D O I：

10.1021/nl1027099

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The band alignments of twin-plane superlattices in semiconductor nanowires are systematically investigated on the basis of density functional calculations. Our calculations demonstrate that for nanowires with small diameters the quantum-confinement effect is prominent within wurtzite structure regions and the energy gap in wurtzite-structured nanowires is remarkably larger than that including zinc-blende structure. This results in the straddling band alignment, in which both electrons and holes are confined in zinc-blonde structure region. The analysis using a simple tight-binding methods also clarifies that the straddling band alignments can be realized when the diameters of nanowires are less than 4-8 nm, leading to full control of band alignments by varying the nanowire diameter. Our results provide the ability of band-alignment tuning and open new possibilities for band engineering.

引用

页码：4614 / 4618

页数：5

共 32 条

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