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Oscillations in Absorption from InGaN/GaN Quantum Well to Continuum.

Marta Gładysiewicz-Kudrawiec1, Mikołaj Żak2, Witold Trzeciakowski2

  • 1Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.

Nanomaterials (Basel, Switzerland)
|February 13, 2025
PubMed
Summary

We theoretically analyzed an InGaN/GaN n-i-p diode with a single quantum well. The study reveals voltage-dependent oscillatory absorption spectra due to quantum wavefunction interference effects.

Keywords:
InGaN/GaN p-i-n diodeelectric field effect on intersubband absorptioninfrared absorptionquantum well

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Area of Science:

  • Semiconductor Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Indium Gallium Nitride (InGaN) and Gallium Nitride (GaN) heterostructures are crucial for optoelectronic devices.
  • Understanding carrier dynamics and optical properties in quantum wells is essential for device optimization.

Purpose of the Study:

  • To theoretically investigate the optical absorption properties of an InGaN/GaN n-i-p diode with a single quantum well.
  • To analyze the influence of applied voltage on the absorption spectrum and identify the underlying physical mechanisms.

Main Methods:

  • Utilized a Schrodinger-Poisson drift-diffusion solver to calculate the band structure.
  • Computed optical absorption from the bound state to the continuum.
  • Analyzed the effect of voltage on wavefunction interference and spectral oscillations.

Main Results:

  • Demonstrated voltage-dependent oscillatory behavior in the absorption spectrum.
  • Observed a decrease in oscillation amplitude with increasing negative voltage.
  • Attributed oscillations to wavefunction interference between the quantum well edges and the potential barrier slope.

Conclusions:

  • The InGaN/GaN n-i-p diode exhibits unique voltage-tunable optical absorption characteristics.
  • Wavefunction interference is a key factor governing the observed spectral oscillations.
  • This theoretical analysis provides insights for designing advanced nitride-based optoelectronic devices.