Abstract

High energy focused ion beam implantation of Ga is used to interdiffuse AlGaAs/GaAs quantum wells. Results from low temperature cathodoluminescence, time-decay photoluminescence measurements and photolumuniscence excitation spectroscopy indicate a good quality of the interdiffused quantum wells. The broadened luminescence peaks are explained by spatial inhomogeneities of the interdiffusion. Quantum boxes were fabricated and studied by cathodoluminescence line scanning. The introduction of a few monolayers of InGaAs close to the quantum well resulted in a remarkable improvement of the homogeneity of the interdiffusion.

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