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Portrait of Reine Wallenberg. Photo: Kennet Ruona

Reine Wallenberg

Professor, Coordinator Materials Science

Portrait of Reine Wallenberg. Photo: Kennet Ruona

Independent Control of Nucleation and Layer Growth in Nanowires

Author

  • Carina B. Maliakkal
  • Erik K. Mårtensson
  • Marcus Ulf Tornberg
  • Daniel Jacobsson
  • Axel R. Persson
  • Jonas Johansson
  • Lars Reine Wallenberg
  • Kimberly A. Dick

Summary, in English

Control of the crystallization process is central to developing nanomaterials with atomic precision to meet the demands of electronic and quantum technology applications. Semiconductor nanowires grown by the vapor-liquid-solid process are a promising material system in which the ability to form components with structure and composition not achievable in bulk is well-established. Here, we use in situ TEM imaging of Au-catalyzed GaAs nanowire growth to understand the processes by which the growth dynamics are connected to the experimental parameters. We find that two sequential steps in the crystallization process - nucleation and layer growth - can occur on similar time scales and can be controlled independently using different growth parameters. Importantly, the layer growth process contributes significantly to the growth time for all conditions and will play a major role in determining material properties such as compositional uniformity, dopant density, and impurity incorporation. The results are understood through theoretical simulations correlating the growth dynamics, liquid droplet, and experimental parameters. The key insights discussed here are not restricted to Au-catalyzed GaAs nanowire growth but can be extended to most compound nanowire growths in which the different growth species has very different solubility in the catalyst particle.

Department/s

  • Centre for Analysis and Synthesis
  • Solid State Physics
  • NanoLund
  • nCHREM/ Reine Wallenberg-lup-obsolete

Publishing year

2020-02-21

Language

English

Pages

3868-3875

Publication/Series

ACS Nano

Volume

14

Issue

4

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Condensed Matter Physics
  • Chemical Process Engineering

Keywords

  • Au-catalyzed
  • compound nanowires
  • GaAs nanowires
  • In situ TEM
  • incubation time before each layer

Status

Published

Research group

  • nCHREM/ Reine Wallenberg-lup-obsolete

ISBN/ISSN/Other

  • ISSN: 1936-0851