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Semimetallic Graphene for Infrared Sensing.

Hamza Zad Gul, Wonkil Sakong, Hyunjin Ji

  • 1Department of Electrical and Computer Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania 15261 , United States.

ACS Applied Materials & Interfaces
|May 3, 2019
PubMed
Summary

Graphene

Keywords:
IR detectionlayered materialsroom-temperature operationsemimetalthermoelectric

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Conventional infrared (IR) detectors rely on materials with optical band gaps.
  • Graphene's unique zero band gap and conical band structure differ from traditional sensing materials.
  • Existing IR detectors often require absorbers due to the band gap mismatch with IR wavelengths.

Purpose of the Study:

  • To demonstrate room-temperature infrared detection using semimetallic multilayer graphene.
  • To leverage graphene's properties for efficient IR absorption and detection without a separate absorber.
  • To evaluate the performance of graphene-based IR detectors in terms of responsivity, detectivity, and response time.

Main Methods:

  • Utilized semimetallic multilayer graphene as the sensing material.
  • Integrated graphene with a SiN membrane for detector fabrication.
  • Measured optical absorption in the mid-IR region (7-17 μm) and Seebeck coefficient (40-60 μV/K).
  • Characterized detector performance including responsivity, detectivity, and response time.

Main Results:

  • Achieved room-temperature infrared detection using graphene.
  • Demonstrated high optical absorption in the mid-IR range and a significant Seebeck coefficient.
  • Reported high responsivity (140 V/W) and detectivity (5 × 108 cm·Hz1/2/W at 5 Hz).
  • Obtained a fast response time of 600 μs.
  • Successfully detected IR from a human body and tracked movement using a graphene IR sensor array.

Conclusions:

  • Semimetallic multilayer graphene enables efficient room-temperature IR detection without an absorber.
  • Graphene's properties offer a promising alternative to conventional materials for IR sensing.
  • The developed graphene-based IR sensor array shows potential for scalable applications in thermal imaging and motion tracking.