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Graphene-Based Light Sensing: Fabrication, Characterisation, Physical Properties and Performance.

Adolfo De Sanctis1, Jake D Mehew2, Monica F Craciun3

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Materials (Basel, Switzerland)
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Functionalized graphene and hybrid photodetectors overcome key limitations in light detection. Novel approaches enhance performance, stability, and versatility for advanced optical sensors.

Keywords:
electronic devicesfunctionalisationgraphenegraphene oxidephotodetectorssensors

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Graphene's exceptional optical and electrical properties offer potential for novel light detection applications.
  • Current graphene-based photodetectors face challenges including limited linear dynamic range (LDR), inefficient charge generation/extraction, hot-carrier effects, fabrication scalability, and environmental stability.

Purpose of the Study:

  • To review advancements in functionalized graphene and hybrid photodetectors.
  • To focus on the physical mechanisms governing photoresponse and device performance.
  • To explore future research directions in graphene-based photodetector technology.

Main Methods:

  • Chemical functionalization of graphene.
  • Hybridization of graphene with light-sensitizing materials (e.g., nanoparticles, quantum dots).
  • Formation of heterostructures with other 2D materials (e.g., transition-metal dichalcogenides).
  • Intercalation of graphene with FeCl3 for enhanced LDR and stability.
  • Utilizing graphene oxide (GO) for broad frequency photodetection.

Main Results:

  • Functionalization and hybridization strategies have led to improved performance, stability, and versatility in graphene-based photodetectors.
  • Intercalated graphene exhibits high stability and unprecedented LDR.
  • Graphene oxide (GO) enables photodetection across UV to THz frequencies.
  • Nanoparticles and quantum dots enhance graphene absorption and enable high gain via the photogating effect.
  • Hybrid detectors with transition-metal dichalcogenides demonstrate high gain and responsivity.

Conclusions:

  • Functionalized graphene and hybrid photodetectors represent a significant advancement over traditional designs.
  • These novel approaches effectively address the limitations of early graphene-based photodetectors.
  • Continued research into physical mechanisms and material combinations promises further breakthroughs in optical sensing technology.