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Related Concept Videos

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Subnanosecond flash memory enabled by 2D-enhanced hot-carrier injection.

Yutong Xiang1, Chong Wang1, Chunsen Liu2

  • 1State Key Laboratory of Integrated Chips and Systems, College of Integrated Circuits and Micro-Nano Electronics, Frontier Institute of Chip and System, Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai, China.

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|April 16, 2025
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Summary
This summary is machine-generated.

Researchers developed a novel two-dimensional graphene-channel flash memory. This advanced non-volatile memory achieves program speeds under one nanosecond, surpassing traditional flash and matching volatile static random-access memory speeds.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • Non-volatile memory technologies, particularly flash memory, face limitations in programming speed, hindering advancements in high-performance computing and data storage.
  • Existing non-volatile flash memory struggles to meet the sub-nanosecond programming speed requirement, a benchmark met by volatile static random-access memory.
  • Emerging memory technologies are exploring novel materials and physics to overcome the speed bottleneck inherent in current non-volatile memory solutions.

Purpose of the Study:

  • To develop a non-volatile memory device capable of achieving program speeds below one nanosecond.
  • To investigate a two-dimensional (2D) Dirac graphene-channel flash memory utilizing a 2D-enhanced hot-carrier-injection mechanism.
  • To demonstrate that advanced 2D materials can enable non-volatile memory to outperform high-speed volatile memory.

Main Methods:

  • Fabrication of a two-dimensional Dirac graphene-channel flash memory device.
  • Implementation of a two-dimensional-enhanced hot-carrier-injection mechanism for programming.
  • Characterization of programming speed, non-volatile storage capability, and endurance cycles.
  • Analysis of the electric-field distribution and injection current in the thin-body channel.
  • Investigation of hot-hole injection in two-dimensional tungsten diselenide.

Main Results:

  • The developed Dirac channel flash memory achieved a programming speed of 400 picoseconds.
  • The device demonstrated robust non-volatile storage and endurance exceeding 5.5 × 10^6 cycles.
  • Optimization of the thin-body channel improved the horizontal electric-field (Ey) distribution, enhancing program efficiency.
  • The injection current reached 60.4 pA μm⁻¹ at |VDS| = 3.7 V.
  • Two-dimensional tungsten diselenide exhibited distinct two-dimensional-enhanced hot-hole injection behavior.

Conclusions:

  • The novel two-dimensional Dirac graphene-channel flash memory successfully overcomes the speed limitations of conventional non-volatile memory.
  • The device achieves sub-nanosecond programming speeds, matching the performance of volatile static random-access memory.
  • This work highlights the potential of two-dimensional materials and advanced hot-carrier-injection mechanisms for next-generation high-speed non-volatile memory.