In-Plane Polarization-Triggered WS₂-Ferroelectric Heterostructured Synaptic Devices.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Neuroscience

Background:

• Conventional computing faces the von Neumann bottleneck, driving research into neuromorphic computing using memristors.
• Existing memristors often exhibit stochasticity and poor uniformity due to reliance on conductive filaments or traps.

Purpose of the Study:

• To develop highly uniform and reliable memristors for artificial synapses and neurons.
• To explore the use of two-dimensional materials integrated with ferroelectrics for neuromorphic applications.

Main Methods:

• Fabrication of a heterostructure comprising a two-dimensional tungsten disulfide (WS₂) monolayer and a ferroelectric lead zirconate titanate (PZT) film.
• Investigating resistance switching behavior modulated by in-plane ferroelectric polarization.
• Utilizing photoluminescence (PL) spectroscopy to verify lateral fields and characterize device properties.

Main Results:

• The WS₂/PZT heterostructure memristors demonstrated resistance switching governed by the dynamic regulation of Schottky barriers.
• In-plane ferroelectric polarization effectively tuned the photoluminescence and conductivity of the heterostructures.
• The memristors successfully emulated key neuromorphic functions, including threshold-driven spiking and paired-pulse facilitation (PPF).

Conclusions:

• WS₂/PZT heterostructures with in-plane polarization offer a promising pathway for creating uniform and efficient memristors.
• These devices show significant potential for the hardware implementation of artificial neural networks, overcoming limitations of conventional architectures.