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Related Experiment Video

Updated: Aug 3, 2025

Graphene-Assisted Quasi-van der Waals Epitaxy of AlN Film on Nano-Patterned Sapphire Substrate for Ultraviolet Light Emitting Diodes
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High quality AlN film assisted by graphene/sputtered AlN buffer layer for deep-ultraviolet-LED.

Haidi Wu1,2, Jing Ning1,2, Jincheng Zhang1,2

  • 1The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Xidian University, Xi'an 710071, People's Republic of China.

Nanotechnology
|April 12, 2023
PubMed
Summary

This study introduces a novel method using graphene and sputtered aluminum nitride (AlN) to create high-quality AlN epitaxial layers. This significantly reduces dislocations, enabling high-performance deep ultraviolet light-emitting diodes (DUV-LEDs).

Keywords:
DUV-LEDMOCVDgraphenenitridesvan der waals epitaxial

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Optoelectronics

Background:

  • Van der Waals epitaxy of nitrides is a key research area.
  • Graphene is crucial for developing epitaxial aluminum nitride (AlN) layers.
  • High-quality AlN is essential for deep ultraviolet light-emitting diodes (DUV-LEDs).

Purpose of the Study:

  • To develop a method for obtaining high-quality, low-dislocation AlN epitaxial layers.
  • To fabricate efficient AlGaN-based DUV-LEDs using the improved AlN layer.
  • To investigate the role of a sputtered AlN/graphene nucleation layer in dislocation reduction.

Main Methods:

  • Utilizing metal organic chemical vapor deposition (MOCVD).
  • Employing a combined sputtered AlN and graphene nucleation layer on a C-sapphire substrate.
  • Characterizing the AlN epitaxial layer and fabricated DUV-LED performance.

Main Results:

  • A significant reduction in screw dislocation density in the AlN epitaxial layer (from 2.31 × 10^9 to 2.08 × 10^8 cm^-2).
  • Successful fabrication of a 277 nm AlGaN-based DUV-LED.
  • The DUV-LED exhibited low leakage current (nanoampere range) and a forward turn-on voltage of 3.5 V at room temperature.

Conclusions:

  • The sputtered AlN/graphene nucleation layer effectively promotes stress release and dislocation annihilation.
  • This strategy yields high-quality AlN films suitable for high-performance DUV-LED applications.
  • The findings offer a promising pathway for advancing DUV optoelectronic devices.