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Metastable crystalline AuGe catalysts formed during isothermal germanium nanowire growth.


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Authors

Gamalski, AD 
Tersoff, J 
Sharma, R 

Abstract

We observe the formation of metastable AuGe phases without quenching, during strictly isothermal nucleation and growth of Ge nanowires, using video-rate lattice-resolved environmental transmission electron microscopy. We explain the unexpected formation of these phases through a novel pathway involving changes in composition rather than temperature. The metastable catalyst has important implications for nanowire growth, and more broadly, the isothermal process provides both a new approach to growing and studying metastable phases, and a new perspective on their formation.

Description

Keywords

0912 Materials Engineering

Journal Title

Phys Rev Lett

Conference Name

Journal ISSN

0031-9007
1079-7114

Volume Title

108

Publisher

American Physical Society (APS)
Sponsorship
European Research Council (279342)
A. D. G. acknowledges funding from the Marshall Aid Commemoration Commission and the National Science Foundation. S. H. and C. D. acknowledge funding from the Royal Society. S. H. acknowledges funding from ERC grant InsituNANO (n°279342).