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Related Experiment Video

Updated: Jan 19, 2026

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High-performance flat-type InGaN-based light-emitting diodes with local breakdown conductive channel.

Seung-Hye Baek1, Hyun-Jin Lee1, Sung-Nam Lee2

  • 1Department of Nano-Optical Engineering, Korea Polytechnic University, Siheung, 15073, Republic of Korea.

Scientific Reports
|September 22, 2019
PubMed
Summary

Researchers developed novel InGaN-based LEDs without an n-type electrode using a local breakdown conductive channel (LBCC). Higher indium content in quantum wells improved LBCC conductivity, enhancing LED performance.

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Optoelectronics

Background:

  • Indium Gallium Nitride (InGaN) based Light-Emitting Diodes (LEDs) are crucial for solid-state lighting.
  • Fabrication of InGaN LEDs typically requires an n-type contact electrode.
  • Developing novel device architectures can improve LED efficiency and manufacturing.

Purpose of the Study:

  • To develop flat-type InGaN LEDs without an n-type contact electrode.
  • To investigate the impact of Indium (In) content in InGaN quantum wells (QWs) on the local breakdown conductive channel (LBCC) phenomenon.
  • To optimize LBCC formation for enhanced LED performance.

Main Methods:

  • Fabrication of InGaN-based LEDs with varying In content in QWs.
  • Characterization using Electroluminescence (EL) and X-ray diffraction (XRD).
  • Controlled reverse breakdown to form LBCC.
  • Electrical and optical performance testing of developed LEDs.

Main Results:

  • Increased In content in InGaN QWs led to decreased homogeneity and crystallinity.
  • Higher In content resulted in increased reverse leakage current and reduced breakdown voltage.
  • LBCC formation was observed after reverse breakdown, with size and anisotropy increasing with In content.
  • LBCC resistance decreased with higher In content, improving conductivity.
  • Flat-type InGaN LEDs without n-type electrodes were successfully fabricated using LBCC.
  • Lower LBCC resistance correlated with lower overall device resistance and higher light emission.

Conclusions:

  • The In content of InGaN QWs significantly influences the LBCC phenomenon and LED performance.
  • LBCC formation provides a viable pathway for fabricating InGaN LEDs without a traditional n-type electrode.
  • Optimizing In content can lead to more efficient and lower-resistance flat-type InGaN LEDs.