Optical properties of Si-doped GaN

作者: E. F. Schubert , I. D. Goepfert , W. Grieshaber , J. M. Redwing

DOI: 10.1063/1.119689

关键词: Analytical chemistryAbsorption (electromagnetic radiation)LuminescenceStokes shiftMaterials scienceBand gapPhotoluminescenceCondensed matter physicsImpurityDopingLaser linewidth

摘要: The optical properties of n-type GaN are investigated for Si doping concentrations ranging from 5×1016 to 7×1018 cm−3. photoluminescence linewidth the near-band gap transition increases 47 78 meV as concentration is increased. broadening modeled in terms potential fluctuations caused by random distribution donor impurities. Good agreement found between experimental and theoretical results. intensity near-band-gap monotonically increased indicating that nonradiative transitions dominate at a low density. comparison absorption, luminescence, reflectance, photoreflectance measurements reveals absence Stokes shift room temperature demonstrating intrinsic nature edge transition.

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