Phase separation induced by Au catalysts in ternary InGaAs nanowires

Ya Nan Guo; Hong Yi Xu; Graeme J. Auchterlonie; Tim Burgess; Hannah J. Joyce; Qiang Gao; Hark Hoe Tan; Chennupati Jagadish; Hai Bo Shu; Xiao Shuang Chen; Wei Lu; Yong Kim; Jin Zou

doi:10.1021/nl304237b

Phase separation induced by Au catalysts in ternary InGaAs nanowires

Ya Nan Guo, Hong Yi Xu, Graeme J. Auchterlonie, Tim Burgess, Hannah J. Joyce, Qiang Gao, Hark Hoe Tan, Chennupati Jagadish, Hai Bo Shu, Xiao Shuang Chen, Wei Lu, Yong Kim, Jin Zou^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

76 Citations (Scopus)

Abstract

We report a novel phase separation phenomenon observed in the growth of ternary In_xGa_1-xAs nanowires by metalorganic chemical vapor deposition. A spontaneous formation of core-shell nanowires is investigated by cross-sectional transmission electron microscopy, revealing the compositional complexity within the ternary nanowires. It has been found that for In_xGa_1-xAs nanowires high precursor flow rates generate ternary In_xGa_1-xAs cores with In-rich shells, while low precursor flow rates produce binary GaAs cores with ternary In _xGa_1-xAs shells. First-principle calculations combined with thermodynamic considerations suggest that this phenomenon is due to competitive alloying of different group-III elements with Au catalysts, and variations in elemental concentrations of group-III materials in the catalyst under different precursor flow rates. This study shows that precursor flow rates are critical factors for manipulating Au catalysts to produce nanowires of desired composition.

Original language	English
Pages (from-to)	643-650
Number of pages	8
Journal	Nano Letters
Volume	13
Issue number	2
DOIs	https://doi.org/10.1021/nl304237b
Publication status	Published - 13 Feb 2013

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@article{7c67b1248a74408181634afe740e3695,

title = "Phase separation induced by Au catalysts in ternary InGaAs nanowires",

abstract = "We report a novel phase separation phenomenon observed in the growth of ternary InxGa1-xAs nanowires by metalorganic chemical vapor deposition. A spontaneous formation of core-shell nanowires is investigated by cross-sectional transmission electron microscopy, revealing the compositional complexity within the ternary nanowires. It has been found that for InxGa1-xAs nanowires high precursor flow rates generate ternary InxGa1-xAs cores with In-rich shells, while low precursor flow rates produce binary GaAs cores with ternary In xGa1-xAs shells. First-principle calculations combined with thermodynamic considerations suggest that this phenomenon is due to competitive alloying of different group-III elements with Au catalysts, and variations in elemental concentrations of group-III materials in the catalyst under different precursor flow rates. This study shows that precursor flow rates are critical factors for manipulating Au catalysts to produce nanowires of desired composition.",

keywords = "III-V semiconductor nanowires, InGaAs, core-shell nanowires, phase separation, ternary semiconductors",

author = "Guo, {Ya Nan} and Xu, {Hong Yi} and Auchterlonie, {Graeme J.} and Tim Burgess and Joyce, {Hannah J.} and Qiang Gao and Tan, {Hark Hoe} and Chennupati Jagadish and Shu, {Hai Bo} and Chen, {Xiao Shuang} and Wei Lu and Yong Kim and Jin Zou",

year = "2013",

month = feb,

day = "13",

doi = "10.1021/nl304237b",

language = "English",

volume = "13",

pages = "643--650",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "2",

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TY - JOUR

T1 - Phase separation induced by Au catalysts in ternary InGaAs nanowires

AU - Guo, Ya Nan

AU - Xu, Hong Yi

AU - Auchterlonie, Graeme J.

AU - Burgess, Tim

AU - Joyce, Hannah J.

AU - Gao, Qiang

AU - Tan, Hark Hoe

AU - Jagadish, Chennupati

AU - Shu, Hai Bo

AU - Chen, Xiao Shuang

AU - Lu, Wei

AU - Kim, Yong

AU - Zou, Jin

PY - 2013/2/13

Y1 - 2013/2/13

N2 - We report a novel phase separation phenomenon observed in the growth of ternary InxGa1-xAs nanowires by metalorganic chemical vapor deposition. A spontaneous formation of core-shell nanowires is investigated by cross-sectional transmission electron microscopy, revealing the compositional complexity within the ternary nanowires. It has been found that for InxGa1-xAs nanowires high precursor flow rates generate ternary InxGa1-xAs cores with In-rich shells, while low precursor flow rates produce binary GaAs cores with ternary In xGa1-xAs shells. First-principle calculations combined with thermodynamic considerations suggest that this phenomenon is due to competitive alloying of different group-III elements with Au catalysts, and variations in elemental concentrations of group-III materials in the catalyst under different precursor flow rates. This study shows that precursor flow rates are critical factors for manipulating Au catalysts to produce nanowires of desired composition.

AB - We report a novel phase separation phenomenon observed in the growth of ternary InxGa1-xAs nanowires by metalorganic chemical vapor deposition. A spontaneous formation of core-shell nanowires is investigated by cross-sectional transmission electron microscopy, revealing the compositional complexity within the ternary nanowires. It has been found that for InxGa1-xAs nanowires high precursor flow rates generate ternary InxGa1-xAs cores with In-rich shells, while low precursor flow rates produce binary GaAs cores with ternary In xGa1-xAs shells. First-principle calculations combined with thermodynamic considerations suggest that this phenomenon is due to competitive alloying of different group-III elements with Au catalysts, and variations in elemental concentrations of group-III materials in the catalyst under different precursor flow rates. This study shows that precursor flow rates are critical factors for manipulating Au catalysts to produce nanowires of desired composition.

KW - III-V semiconductor nanowires

KW - InGaAs

KW - core-shell nanowires

KW - phase separation

KW - ternary semiconductors

UR - http://www.scopus.com/inward/record.url?scp=84873688819&partnerID=8YFLogxK

U2 - 10.1021/nl304237b

DO - 10.1021/nl304237b

M3 - Article

SN - 1530-6984

VL - 13

SP - 643

EP - 650

JO - Nano Letters

JF - Nano Letters

IS - 2

ER -

Phase separation induced by Au catalysts in ternary InGaAs nanowires

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