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MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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One-Selector-One-Resistor Integrated Memory Cells Based on Two-Dimensional Heterojunction Memory Selectors.

Minliang Shen1, Sheng Shen1, Yueyang Jia1

  • 1University of Michigan─Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.

ACS Nano
|October 4, 2024
PubMed
Summary
This summary is machine-generated.

Two-dimensional material heterostructures act as selectors in resistive random-access memory (RRAM) cells, significantly reducing sneak path currents. This innovation enhances RRAM performance and enables more efficient 3D memory arrays.

Keywords:
1S1R2D heterojunctionRRAMSchottky barriermemory selector

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Electrical Engineering

Background:

  • Resistive random-access memory (RRAM) arrays suffer from sneak path leakage currents, hindering scalability.
  • Two-dimensional (2D) materials offer tunable properties for fabricating advanced electronic components.
  • Van der Waals heterostructures provide a versatile platform for designing novel device functionalities.

Purpose of the Study:

  • To demonstrate 2D-material-based heterostructure selectors for RRAM applications.
  • To integrate these selectors into one-selector-one-resistor (1S1R) RRAM cells.
  • To evaluate the performance enhancement and potential for 3D memory integration.

Main Methods:

  • Fabrication of multilayer graphene (MG)/tungsten disulfide (WS2)/platinum (Pt) heterostructure selectors.
  • Experimental characterization of current-voltage (I-V) relationships and Schottky barrier properties.
  • Integration of 2D selectors with hafnium oxide (HfOx)-based RRAMs to form 1S1R cells.
  • Circuit-level simulations of 1S1R cells in planar and 3D memory arrays.

Main Results:

  • The MG/WS2/Pt selector exhibited highly nonlinear and asymmetric I-V characteristics due to distinct Schottky barriers.
  • Integrated 1S1R cells demonstrated a reduction in sneak path leakage current by over 100 times.
  • Simulations showed significant power consumption reduction (up to 86%) and improved read/write margins (up to 31%) in large 3D arrays.
  • The selectors successfully provided set compliance current for RRAM operation.

Conclusions:

  • 2D material heterostructures are effective selectors for suppressing sneak path currents in RRAM.
  • The demonstrated 1S1R cells offer a promising pathway for high-density 3D RRAM.
  • This platform has potential for advanced applications like in-memory computing.