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Reduced Graphene Oxide/Amorphous Carbon P-N Junctions: Nanosecond Laser Patterning.

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This study introduces direct laser writing to create high-quality reduced graphene oxide (rGO) films from amorphous carbon, overcoming scalability and high-temperature limitations for advanced electronic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Scalable, high-quality reduced graphene oxide (rGO) production is challenging due to high-temperature requirements (>2000 K).
  • Existing methods for rGO fabrication often introduce traps and defects, limiting device performance.

Purpose of the Study:

  • To develop a novel, scalable method for direct laser writing of reduced graphene oxide (rGO) films.
  • To investigate the properties and potential device applications of laser-processed rGO on silicon substrates.

Main Methods:

  • Direct laser writing using nanosecond laser melting of amorphous carbon on silicon (001) substrates.
  • Ultrafast quenching from the undercooled melt state to form large-area rGO films.
  • Characterization using temperature-dependent electrical measurements and Raman spectroscopy.

Main Results:

  • Formation of large-area reduced graphene oxide (rGO) films via ultrafast quenching.
  • Achieved electron mobility of 12.56 cm²/V s and charge carrier concentration of -1.2 × 10²¹ /cm³.
  • Fabrication of n-type rGO/p-type amorphous carbon p-n junction diodes with a turn-on voltage of 0.3 V and rectification ratio of 110@±1.5 V.

Conclusions:

  • Direct laser writing offers a scalable, low-temperature alternative for high-quality rGO production.
  • The method minimizes defects, enabling high conductivity and mobility in rGO films.
  • Laser-processed rGO/amorphous carbon interfaces facilitate efficient p-n junction diode fabrication.