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A high-performance hydrogen sensor based on a reverse-biased MoS2/GaN heterojunction.

Neeraj Goel1, Rahul Kumar1, Shubhendra Kumar Jain2

  • 1Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India.

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This study presents a novel molybdenum disulfide (MoS2)/gallium nitride (GaN) heterojunction gas sensor. The device demonstrates high sensitivity to hydrogen, with performance significantly enhanced by temperature.

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Area of Science:

  • Materials Science
  • Semiconductor Devices
  • Chemical Sensing

Background:

  • Development of advanced gas sensors is crucial for environmental monitoring and industrial safety.
  • Molybdenum disulfide (MoS2) and gallium nitride (GaN) are promising materials for electronic and sensing applications.
  • Heterojunctions offer unique properties for enhanced device performance.

Purpose of the Study:

  • To fabricate and characterize a MoS2/GaN heterojunction-based gas sensor.
  • To investigate the sensing mechanism and performance of the device, particularly its response to hydrogen.
  • To explore the effect of temperature on the sensor's sensitivity.

Main Methods:

  • Fabrication of MoS2/GaN heterojunction using sputtering and post-sulfurization.
  • Microscopic and spectroscopic characterization to confirm MoS2 film quality.
  • Gas sensing measurements under varying hydrogen concentrations and temperatures.

Main Results:

  • Highly crystalline and homogenous few-atomic-layer MoS2 was successfully deposited on GaN.
  • The MoS2/GaN sensor exhibited high sensitivity to hydrogen, attributed to barrier height modulation at the interface.
  • Sensor sensitivity increased from 21% to 157% for 1% hydrogen with a temperature rise from 25 °C to 150 °C.

Conclusions:

  • The MoS2/GaN heterojunction is a promising platform for highly sensitive gas sensing.
  • Temperature plays a critical role in enhancing the sensor's performance.
  • The demonstrated methodology is adaptable for developing sensors for various gas analytes using different heterostructures.