Journal Article

PUBDB-2015-00892

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of Liquid Indium in the Structural Purity of Wurtzite InAs Nanowires That Grow on Si(111)

Biermanns, A. (Corresponding Author)>Extern* ; Dimakis, E. ; Davydok, A.>Extern* ; Sasaki, T. ; Geelhaar, L.>Extern* ; Takahasi, M. ; Pietsch, U.>Extern*

2014
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/nl502878a

Abstract: InAs nanowires that grow catalyst-free along the [111] crystallographic orientation are prone to wurtzite-zincblende polytypism, making the control of the crystal phase highly challenging. In this work, we explore the dynamic relation between the growth conditions and the structural composition of the nanowires using time-resolved X-ray scattering and diffraction measurements during the growth by molecular beam epitaxy. A spontaneous buildup of liquid indium is directly observed in the beginning of the growth process and associated with the simultaneous nucleation of InAs nanowires predominantly in the wurtzite phase. The highly arsenic-rich growth conditions that we used limited the existence of the liquid indium to a short time interval, which is defined as the nucleation phase. After their nucleation, the nanowires grow in the absence of liquid indium, and with a highly defective wurtzite structure. Complementary ex-situ diffuse X-ray scattering measurements and modeling revealed that this structural degradation is due to the formation of densely spaced stacking faults. Thus, high wurtzite phase purity is associated with the presence of liquid indium. This finding implies that pure wurtzite nanowires may be obtained only if the growth is performed under the continuous presence of liquid indium at the growth interface, that is, in the vapor–liquid–solid mode.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. PETRA Beamline P08 (POF2-54G14) (POF2-54G14)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 10 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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