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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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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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Related Experiment Video

Updated: Oct 9, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Wafer-Scale Oxygen-Doped MoS2 Monolayer.

Zheng Wei1,2, Jian Tang1,2, Xuanyi Li1,2

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

Small Methods
|December 20, 2021
PubMed
Summary

Uniform oxygen doping of wafer-scale monolayer molybdenum disulfide (MoS2) was achieved. This process tunes electronic properties and enables high-performance devices for flexible electronics.

Keywords:
band engineeringfield-effect transistorsmolybdenum disulfideoxygen substitutionwafer-scale doping

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Monolayer molybdenum disulfide (MoS2) is a key 2D semiconductor for advanced electronics.
  • Uniform doping of wafer-scale MoS2 is crucial for tailoring properties and enabling applications.
  • Existing methods struggle with uniform doping of large-scale MoS2.

Purpose of the Study:

  • To achieve uniform oxygen doping in wafer-scale monolayer MoS2 (MoS2-xOx).
  • To investigate the effect of oxygen doping on the electronic band structure.
  • To demonstrate the performance of doped MoS2 in electronic devices.

Main Methods:

  • In situ chemical vapor deposition for uniform oxygen doping of MoS2.
  • Ultrafast infrared spectroscopy to probe electronic properties.
  • First-principles calculations to understand doping mechanisms.
  • Fabrication of field-effect transistors and logic devices.

Main Results:

  • Achieved uniform oxygen doping in wafer-scale monolayer MoS2 with tunable levels (MoS2-xOx).
  • Observed a reduction in bandgap with increasing oxygen doping.
  • Demonstrated excellent electronic performance in fabricated transistors and logic devices.

Conclusions:

  • Uniform oxygen doping is a viable method for tailoring MoS2 properties.
  • Doped MoS2-xOx shows promise for next-generation miniaturized and flexible electronics.
  • This work paves the way for large-scale applications of doped 2D semiconductors.