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Area of Science:

  • Solid State Physics
  • Materials Science
  • Optoelectronics

Background:

  • Micro-light-emitting diodes (LEDs) are crucial for advanced display and lighting technologies.
  • Efficient electrical isolation is essential for high-performance micro-LED arrays.
  • Traditional mesa etching can be problematic for small-scale device fabrication.

Purpose of the Study:

  • To investigate the effects of arsenic multi-energy ion implantation as an alternative to mesa etching for electrical isolation in blue micro-LEDs.
  • To analyze the impact of varying ion implantation depths and profiles on the electrical and optical properties of micro-LEDs.
  • To optimize the fabrication process for improved light output power and external quantum efficiency.

Main Methods:

  • Fabrication of a 3×3 blue micro-LED array (10×10 μm² pixel size, 15 μm pitch) on a sapphire substrate using metalorganic chemical vapor deposition (MOCVD).
  • Utilized photolithography, etching, E-beam evaporation, and multi-energy arsenic ion implantation for device fabrication and isolation.
  • Systematically varied arsenic implantation depth and energy to create different depth profiles.

Main Results:

  • Arsenic implantation effectively replaced mesa etching for electrical isolation, with implantation depth correlating to average energy.
  • Increased implantation depth led to higher light output power and peak external quantum efficiency, improving from 5.33% to 9.82%.
  • Deeper implantation also resulted in a slight increase in efficiency droop (from 46.3% to 48.6%) and potential damage to the n-GaN layer, increasing series resistance.

Conclusions:

  • Multi-energy arsenic ion implantation is a viable method for electrical isolation in blue micro-LED fabrication, offering improved efficiency.
  • Careful control of implantation depth and energy is necessary to balance efficiency gains with potential drawbacks like increased series resistance and droop.
  • Further research can focus on mitigating n-GaN damage and reducing efficiency droop for even better micro-LED performance.