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Updated: Jul 15, 2026

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Monolithically-Integrated van der Waals Synaptic Memory via Bulk Nano-Crystallization.

Jinhyoung Lee1,2, Gunhyoung Kim3, Hyunho Seok4,5,6

  • 1School of Mechanical Engineering, Sungkyunkwan University (SKKU), Suwon-si, Gyeonggi-do, 16419, South Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 27, 2025
PubMed
Summary

This study introduces a novel monolithically-integrated 1-selector and 1-resistive (1S1R) synaptic memory using van der Waals (vdW) heterostructures. This advanced memory technology overcomes limitations for high-density integration in data-driven applications.

Keywords:
1S1R cell2D/3D heterostructuresatomic force microscopyresistive switchingsynaptic memory

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrical Engineering

Background:

  • Data-driven technologies like AI and IoT demand advanced memory solutions.
  • Conventional memory devices face integration challenges for high-density applications.

Purpose of the Study:

  • To report a monolithically-integrated 1-selector and 1-resistive (1S1R) synaptic memory in van der Waals (vdW) heterostructures.
  • To overcome limitations of conventional device integration technologies for advanced memory applications.

Main Methods:

  • Fabrication of vdW heterostructure and 1S1R cell via single-step direct synthesis using plasma-enhanced lattice-distortion.
  • Characterization using scanning-transmission electron microscopy and X-ray photoelectron spectroscopy to analyze plasma-enhanced nano-crystallization of VSe2.
  • Spatial resolution of bipolar resistive switching dynamics using conductive atomic force microscopy.

Main Results:

  • Demonstration of a monolithically-integrated 1S1R synaptic memory in vdW heterostructures.
  • Observation of plasma-enhanced nano-crystallization effects in bulk vdW VSe2.
  • Spatially resolved bipolar resistive switching dynamics.
  • Exhibition of synaptic functionality with linear weight updates and minimal nonlinearity due to interfacial charge accumulation.

Conclusions:

  • The developed monolithically-integrated 1S1R cell offers a systematic platform for next-generation vdW electronics.
  • This approach enables monolithic 3D integration, addressing current device integration limitations.
  • The study paves the way for advanced memory technologies essential for data-driven applications.