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Updated: Apr 13, 2026

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
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Step-flow kinetics model for the vapor-solid-solid Si nanowires growth.

H Cui1, Y Y Lü1, G W Yang1

  • 1†State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics Science and Engineering, and ‡Department of Mechanics, Sun Yat-sen (Zhongshan) University, Guangzhou 510275, People's Republic of China.

Nano Letters
|May 1, 2015
PubMed
Summary
This summary is machine-generated.

The vapor-solid-solid (VSS) process offers an alternative for silicon nanowire growth, avoiding catalyst impurities. A new kinetic model explains VSS growth, aligning with experimental data and revealing a ledge-flow mechanism.

Keywords:
Si nanowireskinetic modelstep-flow growthvapor−solid−solid growth

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemical Engineering

Background:

  • Vapor-solid-solid (VSS) growth is an emerging technique for silicon nanowire (SiNW) fabrication.
  • VSS growth offers advantages over vapor-liquid-solid (VLS) growth, such as preventing catalyst incorporation and enabling abrupt interfaces.
  • Theoretical understanding of VSS growth mechanisms lags behind experimental observations.

Purpose of the Study:

  • To develop a general kinetic model for VSS growth of SiNWs.
  • To elucidate the mass transport limitations governing VSS SiNW growth.
  • To provide a theoretical framework consistent with experimental findings.

Main Methods:

  • Development of a mass-transport-limited kinetic model.
  • Inclusion of three surface diffusion processes for atom supply.
  • Consideration of a slow interface diffusion process for nanowire growth.

Main Results:

  • The model accurately describes SiNW growth via the VSS process.
  • It identifies surface diffusion as the primary atom supply route.
  • Interface diffusion is shown to be the rate-limiting step for nanowire elongation.
  • A successive side-to-side ledge flow mechanism was elucidated.

Conclusions:

  • The developed kinetic model provides a robust theoretical explanation for VSS SiNW growth.
  • The model successfully reconciles experimental data with theoretical predictions.
  • It offers a clear physical insight into the VSS growth mechanism, highlighting the role of surface and interface diffusion.