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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

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Decrease in work function of boron ion-implanted ZnO thin films.

Gi-Seok Heo1, Sang-Jin Hong, Jong-Woon Park

  • 1Energy and Applied Optics Team, Gwangju Research Center, Korea Institute of Industrial Technology, Gwangju 500-480, Korea.

Journal of Nanoscience and Nanotechnology
|December 1, 2007
PubMed
Summary

Boron ion implantation into ZnO thin films modifies electrical and optical properties. Rapid thermal annealing (RTA) and ion dose control film characteristics, enabling work function engineering for potential electronic applications.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Semiconductor Device Physics

Background:

  • Zinc oxide (ZnO) is a promising semiconductor material for optoelectronic applications.
  • Controlling the electrical and optical properties of ZnO thin films is crucial for device performance.
  • Ion implantation is a technique used to modify material properties at the atomic level.

Purpose of the Study:

  • To investigate the effects of boron ion implantation on ZnO thin films.
  • To study the influence of ion dose and rapid thermal annealing (RTA) time on electrical and optical properties.
  • To explore the possibility of engineering the work function of ZnO thin films.

Main Methods:

  • Fabrication of boron ion-implanted ZnO thin films on glass substrates using sputtering.
  • Systematic variation of ion doses and RTA times.
  • Characterization of electrical properties (sheet resistance, resistivity, carrier density, mobility) and optical transmittance.
  • Measurement of work function.

Main Results:

  • Electrical resistivity increased with RTA time but decreased with ion dose.
  • Carrier density increased with ion dose, especially after RTA.
  • Carrier mobility decreased with ion dose without RTA, but remained stable with RTA.
  • Optical transmittance reached up to 87% in the visible range.
  • Work function decreased with increasing ion dose, demonstrating tunability.

Conclusions:

  • Boron ion implantation and RTA are effective methods for tuning the electrical and optical properties of ZnO thin films.
  • The work function of ZnO can be precisely engineered by controlling the boron ion dose.
  • These findings suggest potential applications in tunable electronic devices.