Optical Study of Intermixing in CdTe/CdMgTe Quantum Wells.

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  • Tönnies Dietrich
    Technische Physik, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany
  • Bacher Gerd
    Technische Physik, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany
  • Forchel Alfred
    Technische Physik, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany
  • Waag Andreas
    Experimentelle Physik III, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany
  • Litz Thomas
    Experimentelle Physik III, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany
  • Landwehr Gottfried
    Experimentelle Physik III, Universität Würzburg, Am Hubland, D–97074 Würzburg, Germany

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Abstract

CdTe/CdMgTe quantum wells were processed by rapid thermal annealing (RTA) at temperatures between 390° C and 550° C. Due to the interdiffusion of Cd and Mg ions the photoluminescence of the quantum wells exhibits strong blue shifts up to 360 meV at the highest annealing temperature. This energy shift is close to the total discontinuity of the quantum well structures, indicating an almost perfect interdiffusion of barrier and well material. By using a simple model for the quantum well potential changes due to interdiffusion we derive the interdiffusion length as a function of the annealing temperature. The interdiffusion is characterized by an activation energy of 2.8 eV.

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