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Height-controlled nanowire branches on nanotrees using a polymer mask.

Kimberly A Dick1, Knut Deppert, Magnus W Larsson

  • 1Solid State Physics, Lund University, Box 118, S-221 00 Lund, Sweden.

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|July 29, 2009
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Summary

This study presents a novel method to precisely control the growth of semiconductor nanowire branches. A polymer mask enables predictable positioning of second-generation nanowires, advancing 3D nanostructure fabrication.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Complex 3D dendritic structures are crucial for semiconductor nanowire applications.
  • Sequential seeding of epitaxial nanowires using metal seeds is a key fabrication method.
  • Controlling the position of subsequent nanowire generations remains a challenge.

Purpose of the Study:

  • To develop a method for precise control over the positioning of second-generation epitaxial nanowire branches.
  • To enable predictable growth of complex 3D nanostructures using semiconductor nanowires.

Main Methods:

  • Utilizing a spun-on polymer layer to mask first-generation nanowires to a specific height.
  • Preventing nanowire branching at lower positions and new substrate growth.
  • Demonstration using Metalorganic Vapor Phase Epitaxy (MOVPE)-grown Gallium Phosphide (GaP) nanowires.

Main Results:

  • Successfully demonstrated controlled positioning of second-generation nanowire branches on first-generation trunks.
  • The polymer masking technique effectively guided nanowire growth.
  • The method showed independence from specific materials or growth systems.

Conclusions:

  • The developed procedure offers precise control over epitaxial nanowire branching.
  • This technique is likely transferable to various materials and growth processes.
  • It facilitates the fabrication of intricate 3D nanostructures for advanced applications.