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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Two-dimensional (2D) materials offer unique properties for advanced electronic and optical devices.
  • Photodetectors are crucial components in optoelectronic systems, with ongoing demand for higher speed and lower power consumption.

Purpose of the Study:

  • To demonstrate a high-speed, zero-bias photodetector utilizing Indium Selenide (InSe) and multilayered graphene.
  • To investigate the impact of asymmetric electrodes on photodetector performance, focusing on dark current, responsivity, detectivity, and response speed.

Main Methods:

  • Fabrication of a photodetector device using Au-InSe-multilayered graphene structure.
  • Characterization of the device's optoelectronic properties, including dark current, photocurrent generation, responsivity, detectivity, and radio-frequency (RF) bandwidth.
  • Analysis of the role of asymmetric electrodes in establishing a built-in electric field for enhanced carrier separation.

Main Results:

  • Achieved an ultra-low dark current of 0.1 nA.
  • Demonstrated photovoltaic-effect-driven photocurrent generation with a responsivity of 57.15 mA W⁻¹ and detectivity of 1.58 × 10⁹ Jones at 785 nm.
  • Attained an RF 3 dB bandwidth of 2.5 MHz, corresponding to an ultrafast response time of 140 ns, setting a new benchmark for zero-bias InSe photodetectors.

Conclusions:

  • Asymmetric electrodes in InSe photodetectors create a built-in electric field, accelerating carrier separation and reducing recombination for high-speed operation.
  • The developed InSe-based photodetector exhibits excellent performance (low dark current, high speed, high responsivity) suitable for next-generation optoelectronic applications.
  • This work highlights the significant potential of 2D InSe materials with tailored electrode configurations for low-power, high-performance photodetection.