Le Journal de Physique IV 03 (1993) C5-265-C5-268
Excitonic transitions in GaInAs/GaAs surface quantum wellsJ. DREYBRODT, A. FORCHEL and J.P. REITHMAIER
Technische Physik, University of Würzburg Am Hubland, 97074 Würzburg, Germany
We have studied the influence of the surface on the optical properties of GaInAs/GaAs quantum wells for various top barrier thicknesses. A blue shift of the emission lines up to about 25 meV combined with a line broadening is observed for a 5 nm thick surface quantum well (20% In) without any GaAs coverage. The line broadening as well as the energy shift depend strongly on the quantum well thickness. This can be modeled by assuming a 5 eV vacuum potential at the surface.
© EDP Sciences 1993