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A hot hole-programmed and low-temperature-formed SONOS flash memory.

Yuan-Ming Chang1, Wen-Luh Yang, Sheng-Hsien Liu

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Nanoscale Research Letters
|August 1, 2013
PubMed
Summary

Researchers developed a high-performance titanium, zirconium, silicon oxide (TixZrySizO) flash memory using a low-temperature sol-gel method. This novel material offers excellent charge storage, fast speeds, and long retention for advanced memory applications.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Flash memory devices are crucial for data storage.
  • Developing high-performance memory with low operating voltages and high efficiency is an ongoing challenge.
  • Sol-gel methods offer a versatile route for fabricating advanced materials.

Purpose of the Study:

  • To demonstrate a high-performance TixZrySizO flash memory fabricated using a sol-gel spin-coating method.
  • To investigate the charge storage properties and electrical characteristics of the TixZrySizO film.
  • To optimize the fabrication process for low annealing temperatures.

Main Methods:

  • Utilized a sol-gel spin-coating technique to deposit a TixZrySizO film.
  • Employed a low annealing temperature (600°C for 60 s).
  • Characterized the flash memory's electrical properties, including memory window, program/erase speeds, and charge retention.

Main Results:

  • Achieved a significant memory window of up to 8 V.
  • Demonstrated rapid program/erase speeds of 120:5.2 μs at 6-V operation.
  • Exhibited excellent charge retention with minimal loss at elevated temperatures (5% at 85°C, 10% at 125°C).
  • Determined a hole trapping barrier height of 1.15 eV.

Conclusions:

  • The low-temperature-annealed, high-κ sol-gel TixZrySizO film provides high trapping site density, leading to excellent flash memory performance.
  • The developed fabrication method is efficient and suitable for producing high-performance memory devices.
  • This work contributes to the advancement of non-volatile memory technologies.