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Highly sensitive hot electron bolometer based on disordered graphene.

Qi Han1, Teng Gao2, Rui Zhang1

  • 11] State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, P. R. China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.

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Summary
This summary is machine-generated.

Disordered graphene demonstrates a strong temperature-dependent resistance, enabling ultra-fast and sensitive hot electron bolometers. This advancement overcomes limitations of pristine graphene for advanced radiation detection applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Device Physics

Background:

  • Bolometers detect electromagnetic radiation via temperature-induced resistance changes.
  • Graphene's properties (weak electron-phonon interaction, low heat capacity) are ideal for hot electron bolometers.
  • Pristine graphene exhibits weak dependence of resistance on electronic temperature, limiting bolometer performance.

Purpose of the Study:

  • To engineer graphene with a strongly temperature-dependent resistance for improved bolometer applications.
  • To investigate the performance of disordered graphene in a hot electron bolometer.

Main Methods:

  • Fabrication of a disordered graphene bolometer.
  • Measurement of electrical and optical responsivity at 1.5 K.
  • Calculation of noise equivalent power.

Main Results:

  • Disordered graphene bolometer achieved high electrical responsivity (6 × 10^6 V/W) and optical responsivity (1.6 × 10^5 V/W) at 1.5 K.
  • Low electrical noise equivalent power (1.2 fW/√Hz) and optical noise equivalent power (44 fW/√Hz) were deduced.
  • The device utilizes a minimal structure and does not require high-mobility graphene.

Conclusions:

  • Disordered graphene offers a viable solution for creating highly sensitive and ultra-fast hot electron bolometers.
  • The developed bolometer design represents a significant step towards practical applications of graphene-based radiation detectors.