Atomically Abrupt Silicon-Germanium Axial Heterostructure Nanowires Synthesized in a Solvent Vapor Growth System

被引：59

作者：

Geaney, Hugh ^{[1
,2
]}

Mullane, Emma ^{[1
,2
]}

Ramasse, Quentin M. ^{[3
]}

Ryan, Kevin M. ^{[1
,2
]}

机构：

[1] Univ Limerick, Mat & Surface Sci Inst, Limerick, Ireland

[2] Univ Limerick, Dept Chem & Environm Sci, Limerick, Ireland

[3] SuperSTEM Lab, Daresbury WA4 4AD, Cheshire, England

来源：

NANO LETTERS | 2013年 / 13卷 / 04期

基金：

爱尔兰科学基金会;

关键词：

Heterostructure nanowires; silicon; germanium; interfacial abruptness; solvent vapor growth; aberration corrected STEM analysis; SEMICONDUCTOR NANOWIRES; DEFECT FORMATION; SI NANOWIRES; SOLAR-CELLS; HIGH-YIELD; CATALYST; HETEROJUNCTIONS; ELECTRONICS; MORPHOLOGY; ATOMS;

D O I：

10.1021/nl400146u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth of Si/Ge axial heterostructure nanowires in high yield using a versatile wet chemical approach is reported. Heterostructure growth is achieved using the vapor zone of a high boiling point solvent as a reaction medium with an evaporated tin layer as the catalyst. The low solubility of Si and Ge within the Sn catalyst allows the formation of extremely abrupt heterojunctions of the order of just 1-2 atomic planes between the Si and Ge nanowire segments. The compositional abruptness was confirmed using aberration corrected scanning transmission electron microscopy and atomic level electron energy loss spectroscopy. Additional analysis focused on the role of crystallographic defects in determining interfacial abruptness and the preferential incorporation of metal catalyst atoms near twin defects in the nanowires.

引用

页码：1675 / 1680

页数：6

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