Low-field electron emission from undoped nanostructured diamond

Area of Science:

• Materials Science
• Condensed Matter Physics
• Surface Science

Background:

• Electron emission is crucial for various electronic devices.
• Achieving high current densities at low electric fields remains a significant challenge.
• Nanostructured materials offer unique electronic properties.

Purpose of the Study:

• To investigate electron emission properties of undoped, nanostructured diamond.
• To determine the feasibility of using this material for low-field electron emission applications.
• To understand the underlying mechanisms responsible for enhanced electron emission.

Main Methods:

• Fabrication of a diamond emitter using nanometer-size diamond particulates.
• Heat treatment of the diamond layer in a hydrogen plasma.
• Measurement of electron emission current density as a function of applied electric field.

Main Results:

• Observed strong and sustained electron emission at low electric fields (3-5 V/µm).
• Achieved a current density of 10 milliamperes per square centimeter.
• Demonstrated the lowest reported fields for technologically useful current densities in field-emitting materials.

Conclusions:

• Undoped, nanostructured diamond is a highly promising material for efficient electron emission.
• The high defect density and low electron affinity of diamond contribute to the observed low-field emission.
• The material's ease of fabrication on large substrates makes it technologically viable and economical.