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Indium segregation in InGaN quantum wells forms quantum dot-like centers. These centers exhibit varying biexciton binding energies, confirming their three-dimensional quantum confinement and quantum dot properties.

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Area of Science:

  • Semiconductor physics
  • Materials science
  • Quantum optics

Background:

  • Indium segregation in Indium Gallium Nitride (InGaN) quantum wells is crucial for optoelectronic device performance.
  • Understanding exciton localization centers is key to controlling light emission properties.

Purpose of the Study:

  • To investigate the nature of quantum dot (QD)-like exciton localization centers formed by indium segregation in InGaN single quantum wells.
  • To correlate the geometric properties of these centers with their optical characteristics, specifically exciton and biexciton binding energies.

Main Methods:

  • Cross-section transmission electron microscopy (TEM) to determine QD-like feature size and shape.
  • Scanning near-field optical microscopy (SNOM) to map the spatial distribution of optically active centers.
  • Microphotoluminescence (μ-PL) spectroscopy with excitation power dependencies to identify single-center emissions and measure binding energies.

Main Results:

  • TEM revealed QD-like features with lateral sizes of 1-5 nm.
  • SNOM and μ-PL showed inhomogeneous spatial and spectral distributions of localization centers.
  • Biexciton binding energy (E(b)xx) varied from 3 to -22 meV, correlating with exciton emission energy.
  • Negative binding energies confirmed 3D quantum confinement, indicative of QD-like behavior.

Conclusions:

  • Indium segregation effectively creates QD-like localization centers in InGaN quantum wells.
  • The observed correlation between E(b)xx and exciton energy suggests variations in lateral confinement size.
  • Recombination lifetimes further support the 3D confinement model for these QD-like structures.