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MOS Capacitor01:25

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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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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Updated: Jun 13, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Semiconductive-Metallic Heterostructure Endowing Strong Built-In Electric Field for Fast and Stable Sodium Storage.

Yanbo Zhou1, Peishan Wang1, Hewen Dong1

  • 1School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.

ACS Applied Materials & Interfaces
|June 2, 2025
PubMed
Summary

This study introduces ZnSe/VSe2@NC heterostructures for sodium-ion batteries (SIBs). These materials demonstrate enhanced electrochemical performance and stability, offering a promising anode for next-generation energy storage.

Keywords:
built-in electric fieldcore–shell structuremetal–organic frameworksemiconductive-metallic heterostructuresodium-ion batterytransition metal selenides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transition metal selenides are promising energy storage materials but face challenges in reaction kinetics and stability.
  • Constructing heterostructures is a key strategy to enhance ion diffusion, conductivity, and electrode stability.

Purpose of the Study:

  • To develop novel ZnSe/VSe2@NC heterostructured materials for high-performance sodium-ion batteries (SIBs).
  • To investigate the impact of heterointerfaces on electrochemical performance and stability.

Main Methods:

  • An in situ self-assembly strategy was employed to encapsulate VO(acac)2 within ZIF-8, forming ZnSe/VSe2@NC.
  • Experimental characterization and density-functional theory (DFT) calculations were used to analyze the material properties and interfacial effects.

Main Results:

  • The ZnSe/VSe2@NC heterostructure exhibits a strong built-in electric field at the interface, promoting charge transfer.
  • The material demonstrated excellent rate performance (254.46 mA h g-1 at 10 A g-1) and long cycle stability (317.52 mA h g-1 after 2000 cycles at 5 A g-1) as an SIB anode.

Conclusions:

  • The developed ZnSe/VSe2@NC heterostructure effectively addresses kinetic and stability limitations in transition metal selenides.
  • This work presents a viable strategy for designing advanced anode materials for high-performance SIBs.