Nonvolatile Ferroelectric Memory with Lateral β/α/β In₂Se₃ Heterojunctions

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Van der Waals (vdW) ferroelectric materials, specifically α-In₂Se₃, exhibit electric dipole locking effects, driving interest in nonvolatile electronics.
• Existing ferroelectric tunnel junctions in α-In₂Se₃ have limitations in terms of power consumption and operational speed.

Purpose of the Study:

• To demonstrate the tunneling electroresistance (TER) effect in α-In₂Se₃-based heterojunctions.
• To develop a novel device architecture for low-power, high-speed nonvolatile memory applications.
• To explore the potential of in-plane ferroelectricity in 2D vdW materials for data storage.

Main Methods:

• Fabrication of a lateral β/α/β In₂Se₃ heterojunction using localized laser irradiation.
• Characterization of the tunneling electroresistance effect by measuring conductance changes.
• Investigation of switchable in-plane polarizations to control device conductance.

Main Results:

• Successful demonstration of the tunneling electroresistance effect in the fabricated heterojunction.
• Achieved a significant 4000% magnitude change in tunneling conductance controlled by in-plane polarization.
• Established a correlation between electric dipole orientation and electronic logic bit storage.

Conclusions:

• The developed lateral In₂Se₃ heterojunction shows promise for next-generation nonvolatile memory devices.
• In-plane ferroelectricity in vdW 2D materials offers a new pathway for rewritable memory with enhanced performance.
• This work paves the way for advanced electronic applications leveraging the unique properties of ferroelectric 2D materials.