Publication

Built-in electric field and large Stokes shift in near-lattice-matched GaN/AlInN quantum wells

Nicolas Grandjean, Eric Feltin
2008
Journal Articles

Abstract

Near-lattice-matched GaN/AlInN quantum wells are investigated by means of contactless electroreflectance (CER) and temperature-dependent photoluminescence (PL). Large Stokes shifts, up to 400 meV, between PL peak energies and CER resonances are identified. This Stokes shift is attributed to large potential profile fluctuations (PPFs) in the AlInN barriers. Further evidence for such PPFs and for the additional influence of QW width fluctuations is provided by temperature-dependent PL measurements, demonstrating large PL halfwidths and clear "S-shape" behavior. The influence of a large Stokes shift on the correct determination of the value of the built-in electric field is discussed, and it is shown that PL measurements may lead to a significant overestimation of the built-in electric field in GaN/AlInN QWs. (c) 2008 American Institute of Physics.

Official source

https://infoscience.epfl.ch/entities/publication/adbd325e-31a5-4ec9-8f93-0d4fd65c7e3d

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Nicolas Grandjean, Eric Feltin
2008
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/adbd325e-31a5-4ec9-8f93-0d4fd65c7e3d

About this result

Related concepts (2)

Brillouin scattering

Brillouin scattering (also known as Brillouin light scattering or BLS), named after Léon Brillouin, refers to the interaction of light with the material waves in a medium (e.g. electrostriction and magnetostriction). It is mediated by the refractive index dependence on the material properties of the medium; as described in optics, the index of refraction of a transparent material changes under deformation (compression-distension or shear-skewing).

Raman scattering

Raman scattering or the Raman effect (ˈrɑːmən) is the inelastic scattering of photons by matter, meaning that there is both an exchange of energy and a change in the light's direction. Typically this effect involves vibrational energy being gained by a molecule as incident photons from a visible laser are shifted to lower energy. This is called normal Stokes Raman scattering. The effect is exploited by chemists and physicists to gain information about materials for a variety of purposes by performing various forms of Raman spectroscopy.