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Related Concept Videos

Biasing of P-N Junction01:16

Biasing of P-N Junction

476
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...
476

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Dual polarization for efficient III-nitride-based deep ultraviolet micro-LEDs.

Zhongqiu Xing1, Yongjie Zhou2, Aoxiang Zhang3

  • 1National Center for International Joint Research of Electronic Materials and Systems, International Joint-Laboratory of Electronic Materials and Systems of Henan Province, School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, People's Republic of China. iezqxing@gs.zzu.edu.cn.

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This study introduces a dual-polarized structure to deep ultraviolet (DUV) micro-light emitting diodes (μLEDs), significantly boosting carrier injection and reducing recombination for enhanced performance.

Keywords:
Deep ultraviolet micro-light emitting diodeDual-polarized structureExternal quantum efficiencyOptical powerPolarization electric field

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Area of Science:

  • Optoelectronics
  • Semiconductor Devices
  • Photonics

Background:

  • Deep ultraviolet (DUV) micro-light emitting diodes (μLEDs) suffer from electron leakage and low hole injection efficiency.
  • Mesa side-wall damage from etching creates carrier leakage and non-radiative recombination, degrading μLED performance.
  • Existing challenges limit the photoelectric performance of DUV μLEDs, especially at smaller scales.

Purpose of the Study:

  • To enhance carrier binding and injection efficiency in DUV μLEDs by introducing polarized bulk charges.
  • To mitigate issues like electron leakage, low hole injection, and recombination in μLEDs.
  • To improve the overall photoelectric performance of 279 nm DUV μLEDs.

Main Methods:

  • A dual-polarized structure was implemented by introducing polarized bulk charges into the hole supply layer (p-HSL) and electron supply layer (n-ESL).
  • The polarization-induced bulk charge was used to shield interface charges and reduce the polarization electric field.
  • Analysis of reduced polarization electric fields in p-HSL and n-ESL to understand their impact on carrier dynamics and energy barriers.

Main Results:

  • Electron and hole concentrations in the dual-polarized μLED increased by 77.93% and 93.6%, respectively.
  • Optical power reached 31.04 W/cm², and maximum external quantum efficiency was 2.91%.
  • Efficiency droop was significantly reduced to 2.06% at 120 A/cm².

Conclusions:

  • The dual-polarized structure effectively enhances carrier injection and reduces Shockley-Read-Hall (SRH) recombination in DUV μLEDs.
  • This approach offers a new strategy for developing high-performance DUV μLEDs.
  • The findings contribute to overcoming limitations in carrier injection and recombination for advanced μLED applications.