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Na-doped p-type ZnO microwires.

Wei Liu1, Faxian Xiu, Ke Sun

  • 1Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA. nanoliu@ucla.edu

Journal of the American Chemical Society
|February 10, 2010
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Sodium-doped zinc oxide (ZnO) microwires were synthesized, achieving p-type conductivity. This breakthrough enables new possibilities for ZnO-based electronic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Zinc oxide (ZnO) is a wide bandgap semiconductor with potential for electronic applications.
  • Achieving stable p-type conductivity in ZnO has been a long-standing challenge.
  • Doping strategies are crucial for tailoring ZnO's electrical properties.

Purpose of the Study:

  • To synthesize p-type ZnO microwires using a straightforward method.
  • To confirm the p-type conductivity and characterize the material.
  • To evaluate the potential of these microwires for electronic devices.

Main Methods:

  • Chemical vapor deposition (CVD) for synthesizing ZnO microwires.
  • Sodium (Na) as a dopant source.
  • Fabrication and characterization of single-wire field-effect transistors (FETs).
  • Low-temperature photoluminescence (PL) spectroscopy for doping confirmation.

Main Results:

  • Successful synthesis of p-type ZnO microwires.
  • Confirmation of p-type doping through electrical transport measurements in FETs.
  • Observation of characteristic photoluminescence spectra supporting p-type behavior.
  • Estimation of carrier mobility at approximately 2.1 cm(2) V(-1) S(-1).

Conclusions:

  • The developed CVD method effectively produces p-type ZnO microwires using Na doping.
  • The synthesized microwires exhibit promising electrical properties for electronic applications.
  • This work contributes to overcoming the challenge of p-type doping in ZnO.