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Related Concept Videos

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.
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Capacitor With A Dielectric01:18

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Capacitors01:15

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Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
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Capacitors and Capacitance01:18

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Temperature-induced interfacial intermixing and trap modulation in ONO-based flash memory capacitors.

Hyunseok Son1, Kyumin Sim1, Hae Chul Hwang2

  • 1Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea.

Nanotechnology
|September 18, 2025
PubMed
Summary
This summary is machine-generated.

Hydrogen annealing improves NAND flash memory reliability. Optimal temperatures (400-450°C) enhance charge injection and data retention by reducing interface traps in the oxide-nitride-oxide stack.

Keywords:
activation energycharge trapflash memoryforming gas annealinginterfacial layerintermixing

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Device Physics

Background:

  • NAND flash memory relies on charge-trap dielectric stacks for data storage.
  • Interface properties significantly impact device performance and reliability.
  • Hydrogen annealing is a potential method for interface modification.

Purpose of the Study:

  • To investigate the impact of hydrogen annealing on NAND flash memory capacitors.
  • To analyze the effects of annealing temperature on the interfacial SiOxNylayer.
  • To correlate structural and electrical property changes with device performance.

Main Methods:

  • Fabrication of NAND flash memory capacitors with ONO dielectric stacks.
  • Hydrogen annealing in forming gas at temperatures from 300°C to 500°C.
  • Electrical characterization (C-V, programming speed, retention, endurance).
  • Structural analysis using transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS).

Main Results:

  • Annealing at 400°C-450°C optimized electrical properties.
  • Improved charge injection and reduced interface trap density were observed.
  • Enhanced data retention and endurance were attributed to interface trap passivation and deep trap formation in the nitride.
  • Structural analysis confirmed improved interface quality and nitride trap states.

Conclusions:

  • Hydrogen annealing is an effective method for enhancing NAND flash memory performance and reliability.
  • Optimized annealing temperatures (400°C-450°C) are crucial for maximizing benefits.
  • Understanding the role of the interfacial SiOxNylayer is key to device improvement.