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Study on Pyramidal Molybdenum Nanostructures Cold Cathode with Large-Current Properties Based on Self-Assembly Growth

Yan Shen1, Yuchen Han1, Runze Zhan1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China.

ACS Applied Materials & Interfaces
|July 14, 2020
PubMed
Summary

Researchers developed single-crystalline molybdenum nanostructures for power electronic devices. These optimized nanostructures achieve high current density and large emission currents, making them suitable for field emission cold cathodes.

Keywords:
field emission cold cathodelarge-current and high current densitymolybdenumpyramidal nanostructureself-assembled growth

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Developing field emission cold cathodes for power vacuum electronics requires materials with large current and high current density capabilities.
  • Effective cold cathode materials necessitate good crystallization, appropriate geometric structure, and a well-defined contact interface.

Purpose of the Study:

  • To design and prepare pyramidal molybdenum nanostructures for high-performance cold cathodes.
  • To optimize the nanostructure geometry and interface properties for enhanced field emission.

Main Methods:

  • Self-assembly growth of single-crystalline pyramidal molybdenum nanostructures via thermal evaporation.
  • Optimization of nanostructure sharpening and reduction of the substrate intermediate layer thickness.

Main Results:

  • Achieved a high conductivity of approximately 1.8 × 10^5 Ω^-1 cm^-1 in the molybdenum nanostructures.
  • Demonstrated large-current field emission performance with a maximum emission current of 47.62 mA and current density of 2.38 A cm^-2.
  • The optimized intermediate layer thickness was reduced to 3.1 nm.

Conclusions:

  • The optimized pyramidal molybdenum nanostructures show significant potential as candidates for large-current cold cathodes in power electronic devices.
  • The study highlights the importance of nanostructure design and interface engineering for advanced field emission applications.