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Related Concept Videos

Schottky Barrier Diode01:27

Schottky Barrier Diode

892
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Improved Sensitivity in Schottky Contacted Two-Dimensional MoS2 Gas Sensor.

Youngjun Kim1, Sang-Koo Kang1, Nan-Cho Oh2

  • 1School of Electrical and Electronic Engineering , Yonsei University , Seoul 120-749 , Korea.

ACS Applied Materials & Interfaces
|October 9, 2019
PubMed
Summary
This summary is machine-generated.

This study enhanced two-dimensional molybdenum disulfide (MoS2) gas sensors by controlling Schottky barrier height. This method improved sensitivity and selectivity for harmful gases like nitrogen dioxide (NO2), carbon monoxide (CO), and carbon dioxide (CO2).

Keywords:
Chemical vapor depositionGas sensorMolybdenum disulfideNO2Schottky barrierSchottky contactTransition-metal dichalcogenide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Two-dimensional (2D) transition-metal dichalcogenides are promising for room-temperature gas sensing and flexible electronics.
  • Reliable gas sensor responsivity and selectivity are crucial for detecting environmentally harmful gases.

Purpose of the Study:

  • To improve the sensitivity of 2D molybdenum disulfide (MoS2)-based gas sensors.
  • To achieve enhanced gas detection by controlling the Schottky barrier height.

Main Methods:

  • Synthesized layer-controlled 2D MoS2 using low-temperature chemical vapor deposition.
  • Fabricated a gas sensor and confirmed nitrogen dioxide (NO2) gas responsivity.
  • Varied electrode materials to control Schottky barrier height while keeping MoS2 layer number constant.

Main Results:

  • Increased Schottky barrier height led to enhanced NO2 gas responsivity.
  • The developed sensor showed effectiveness for detecting carbon monoxide (CO) and carbon dioxide (CO2) gases.
  • This approach improved the reactivity of 2D MoS2-based sensors for previously less reactive gases.

Conclusions:

  • Controlling Schottky barrier height is an effective strategy to enhance the sensitivity and selectivity of 2D MoS2 gas sensors.
  • The findings pave the way for more reliable and versatile chemiresistive gas sensors for environmental monitoring.