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Solid-phase diffusion mechanism for GaAs nanowire growth

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor: 677-681
Publikation/Tidskrift/Serie: Nature Materials
Volym: 3
Nummer: 10
Dokumenttyp: Artikel
Förlag: Nature Publishing Group

Sammanfattning

Controllable production of nanometre-sized structures is an important field of research, and synthesis of one-dimensional objects, such as nanowires, is a rapidly expanding area with numerous applications, for example, in electronics, photonics, biology and medicine. Nanoscale electronic devices created inside nanowires, such as p-n junctions(1), were reported ten years ago. More recently, hetero-structure devices with clear quantum-mechanical behaviour have been reported, for example the double-barrier resonant tunnelling diode(2) and the single-electron transistor(3). The generally accepted theory of semiconductor nanowire growth is the vapour-liquid-solid (VLS) growth mechanism(4), based on growth from a liquid metal seed particle. In this letter we suggest the existence of a growth regime quite different from VLS. We show that this new growth regime is based on a solid-phase diffusion mechanism of a single component through a gold seed particle, as shown by in situ heating experiments of GaAs nanowires in a transmission electron microscope, and supported by highly resolved chemical analysis and finite element calculations of the mass transport and composition profiles.

Disputation

Nyckelord

  • Chemistry

Övrigt

Published
Yes
  • ISSN: 1476-1122

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