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Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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Related Experiment Video

Updated: Jul 3, 2026

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Comparative Analysis of Optoelectrical Performance in Laser Lift-Off Process for GaN-Based Green Micro-LED Arrays.

Chuanbiao Liu1,2, Feng Feng3, Zhaojun Liu2,3

  • 1Harbin Institute of Technology, Harbin 150006, China.

Nanomaterials (Basel, Switzerland)
|August 12, 2023
PubMed
Summary

Laser lift-off (LLO) enhances green gallium nitride (GaN) Micro-LED performance by improving light output power and external quantum efficiency. This vital process optimizes Micro-LEDs for advanced display integration without damaging the GaN film or sapphire substrate.

Keywords:
GaN-based Micro-LEDsMicro-LED displaylaser lift-offoptoelectrical performance

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Semiconductor Devices

Background:

  • Micro-LED displays offer superior performance but face integration challenges.
  • Gallium nitride (GaN)-based Micro-LEDs are crucial for high-quality displays.
  • Laser lift-off (LLO) is a key technique for transferring thin films.

Purpose of the Study:

  • To investigate the impact of LLO on GaN-based green Micro-LED arrays.
  • To analyze the optoelectrical properties and structural integrity post-LLO.
  • To assess LLO's suitability for Micro-LED display integration.

Main Methods:

  • Application of LLO to 20 × 38 μm green GaN Micro-LED arrays on patterned sapphire substrates (PSS).
  • Scanning electron microscopy (SEM) for structural integrity assessment.
  • Comprehensive optoelectrical characterization, including light output power (LOP), external quantum efficiency (EQE), electroluminescence spectra, and current-voltage (I-V) measurements.

Main Results:

  • LLO preserved the GaN film and sapphire substrate without damage.
  • Significant enhancements in LOP and EQE were observed post-LLO.
  • Improved color purity with a slight peak wavelength shift and reduced full width at half maximum (FWHM) by approximately 10%.
  • Forward voltage remained unchanged at 2.17 V.

Conclusions:

  • LLO is an effective process for enhancing Micro-LED performance and color quality.
  • The technique facilitates efficient light extraction and improves display integration potential.
  • LLO demonstrates its value in advancing Micro-LED display technology.