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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.
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Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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ZnO/NiO diode-based charge-trapping layer for flash memory featuring low-voltage operation.

Chergn-En Sun1, Chin-Yu Chen1, Ka-Lip Chu1

  • 1Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan.

ACS Applied Materials & Interfaces
|March 18, 2015
PubMed
Summary
This summary is machine-generated.

A novel ZnO/NiO stacked oxide semiconductor enables low-voltage flash memory for green electronics. This innovative charge-trapping layer offers superior performance and long-term stability.

Keywords:
NiOZnOcharge-trapping layerdiodeerase speedgreen flash memorylow power

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • Traditional flash memory technologies face limitations in power consumption and scalability.
  • Developing energy-efficient memory solutions is crucial for the advancement of green electronics.

Purpose of the Study:

  • To propose and characterize a novel stacked oxide semiconductor (ZnO/NiO) as a charge-trapping layer for low-voltage flash memory.
  • To evaluate the performance and stability of the proposed ZnO/NiO based flash memory device.

Main Methods:

  • Fabrication of a stacked ZnO/NiO thin film structure exhibiting diode behavior.
  • Electrical characterization of the memory device, including hysteresis, program/erase voltages, and endurance tests.
  • Analysis of charge loss and retention characteristics over extended periods and temperatures.

Main Results:

  • The ZnO/NiO device demonstrated a large hysteresis memory window (2.02 V) with low program/erase voltages (±3 V).
  • Achieved high operation speed with a significant threshold voltage shift (1.88 V) in 1 ms.
  • Exhibited negligible memory window degradation after 10^5 cycles and projected minimal charge loss (16.2%) over 10 years at 85 °C.

Conclusions:

  • The ZnO/NiO stacked oxide semiconductor provides a promising platform for high-performance, low-voltage, and stable flash memory.
  • The device's performance is attributed to the favorable band alignment of ZnO and the abundant trapping sites in NiO, enhanced by a built-in electric field.
  • This technology is compatible with existing VLSI processes, paving the way for green flash memory solutions.