Nanoscale vacuum channel transistor with in-plane collection structure

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Nanoscale vacuum channel transistors (NVCTs) offer ballistic carrier transport for high-speed applications.
• Fast response characteristics of NVCTs have been a significant challenge, limiting their integration into advanced electronic devices.

Purpose of the Study:

• To fabricate and characterize metal-based NVCTs with enhanced electron collection efficiency.
• To demonstrate the fast temporal response of NVCTs, achieving rise/fall times compatible with solid-state transistors.

Main Methods:

• Fabrication of metal-based NVCTs with a sub-100 nm vacuum channel.
• Design of a specific in-plane collection structure to improve electron emission/collection efficiency.
• Measurement of temporal response (rise/fall time) and electrical performance (drive current, work voltage, on/off ratio).

Main Results:

• Achieved a rise/fall time of less than 100 ns, demonstrating fast temporal response.
• Exhibited excellent electrical performance: high drive current (>10 μA), low work voltage (<10 V), and high on/off current ratio (>10^4).
• The designed in-plane collection structure enhanced electron transport efficiency.

Conclusions:

• The demonstrated fast temporal response of NVCTs is a significant advancement for on-chip vacuum electronics.
• These NVCTs show potential for high-speed and high-integration applications, rivaling low-dimensional solid-state transistors.