Stable field emission performance of SiC-nanowire-based cathodes

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Field Emission Displays (FEDs) offer potential for high-quality visual output.
• Developing efficient and stable field emitters is crucial for advancing FED technology.
• Silicon Carbide (SiC) nanowires present promising properties for field emission applications.

Purpose of the Study:

• To fabricate and evaluate diode-type low-voltage Field Emission Display (FED) devices utilizing SiC-nanowire-based cathodes.
• To characterize the field emission properties of these SiC-nanowire FEDs, focusing on threshold fields, current density, and long-term stability.
• To investigate the underlying physical mechanisms influencing field emission, specifically the role of the Schottky effect.

Main Methods:

• Fabrication of SiC-nanowire-based cathodes for diode-type FED devices.
• Experimental testing of the fabricated FED devices to measure emission characteristics.
• Analysis of field emission data using established models, including Fowler-Nordheim theory.
• Inclusion of Schottky effect analysis to refine the interpretation of field emission data.

Main Results:

• Successful fabrication and testing of low-voltage SiC-nanowire FED devices.
• Demonstration of low emission threshold fields (approximately 2 V µm⁻¹).
• Observation of high current density and stable long-term operational performance.
• Evidence that the Schottky effect significantly impacts field emission, leading to lower true field enhancement factors than predicted by Fowler-Nordheim plots alone.

Conclusions:

• SiC-nanowire cathodes are suitable for fabricating efficient, stable, low-voltage FED devices.
• The Schottky effect is a critical factor in accurately modeling field emission from SiC nanowires.
• Accurate characterization of field emitters requires consideration of multiple physical phenomena beyond simple Fowler-Nordheim analysis.