Sharpening the Interfaces of Axial Heterostructures in Self-Catalyzed AIGaAs Nanowires: Experiment and Theory

被引：68

作者：

Priante, Giacomo ^{[1
]}

Glas, Frank ^{[1
]}

Patriarche, Giles ^{[1
]}

Pantzas, Konstantinos ^{[1
]}

Oehler, Fabrice ^{[1
]}

Harmand, Jean-Christophe ^{[1
]}

机构：

[1] Univ Paris Saclay, CNRS, Lab Photon & Nanostruct, Route Nozay, F-91460 Marcoussis, France

来源：

NANO LETTERS | 2016年 / 16卷 / 03期

关键词：

Nanowires; self-catalyzed; interfaces; heterostructure; AlGaAs; HAADF; GAAS NANOWIRES; AL-AS; GROWTH; ABRUPTNESS; HETEROJUNCTIONS; MICROSCOPY; DROPLET;

D O I：

10.1021/acs.nanolett.5b05121

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth of III-III-V axial heterostructures in nanowires via the vapor-liquid-solid method is deemed to be unfavorable because of the high solubility of group III elements in the catalyst droplet. In this work, we study the formation by molecular beam epitaxy of self-catalyzed GaAs nanowires with Al-x-Ga1-x As insertions. The composition profiles are extracted and analyzed with monolayer resolution using high-angle annular dark-field scanning transmission electron microscopy. We test successfully several growth procedures to sharpen the hetero-interfaces. For a given nanowire geometry, prefilling the droplet with Al atoms is shown to be the most efficient way to reduce the width of the GaAs/AlxGa1-xAs interface. Using the thermodynamic data available in the literature, we develop numerical and analytical models of the composition profiles, showing very good agreement with experiments. These models suggest that atomically sharp interfaces are attainable for catalyst droplets of small volumes.

引用

页码：1917 / 1924

页数：8

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