Polar Ohmic Contact Switching with a Ferroelectric Metal.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Electric polarization is crucial for nanoscale electronic devices, particularly in ferroelectric materials exhibiting nonvolatile polarization switching.
• The recent discovery of 2D ferroelectric conductors allows for current switching in atomically thin channels, but controlling polarization effects at interfaces remains a challenge.

Purpose of the Study:

• To investigate switchable polar ohmic contacts and channels using 2D ferroelectric WTe2.
• To understand the impact of these contacts on nonvolatile switching operations in electronic devices.

Main Methods:

• Fabrication of devices utilizing 2D ferroelectric WTe2.
• Characterization of transport properties and switching performance in a two-terminal geometry.
• Analysis of the modulation of the proximity effect by the polar 2D channel.

Main Results:

• Demonstration of switchable polar ohmic contacts and channels with WTe2.
• Achieved a 390-fold increase in switching performance compared to solely gating the ferroelectric channel.
• Showcased modulation of the proximity effect between the channel and metal electrodes.

Conclusions:

• Controlling polar ohmic contacts is a promising strategy to overcome short-channel effects in nanoscale devices.
• The developed WTe2-based devices offer potential for multiple conductance states, crucial for neuromorphic computing applications.