Microelectronic current-sourcing device based on band-to-band tunneling current

Area of Science:

• Semiconductor device physics
• Materials science
• Nanotechnology

Background:

• Band-to-band tunneling (BTBT) is a quantum mechanical phenomenon crucial for advanced semiconductor devices.
• Tungsten disulfide (WS2) is a promising 2D material for next-generation electronics.
• Achieving stable current sourcing with low power consumption remains a key challenge in transistor design.

Purpose of the Study:

• To develop a novel stable current-sourcing transistor.
• To leverage the band-to-band tunneling phenomenon for device operation.
• To explore the use of WS2 and silicon heterojunctions for enhanced transistor performance.

Main Methods:

• Fabrication of a heterojunction device using thin-film WS2 and heavily hole-doped bulk silicon.
• Engineering the WS2 channel to create both electron-doped and hole-doped regions.
• Utilizing gate bias to control tunneling barrier thickness for device switching.

Main Results:

• Demonstrated a stable current-sourcing transistor based on band-to-band tunneling.
• Output current is effectively regulated by tunneling barrier thickness, controlled by gate bias.
• Achieved minimum line sensitivity of 2.6% and a temperature coefficient of 1.4 × 10^3 ppm/°C.
• Device exhibits ultralow output current and power consumption.

Conclusions:

• The developed WS2/Si heterojunction transistor successfully utilizes band-to-band tunneling for stable current sourcing.
• The device's unique operating principle allows for low power consumption and stable performance.
• This technology holds potential for applications requiring efficient and reliable current sourcing.