Abstract
Dimethylethylamine alane (DMEAA) has been used as an Al precursor for the growth of AlGaAs alloys and AlGaAs/GaAs quantum wells by metalorganic molecular beam epitaxy (MOMBE). It is shown that DMEAA is a very convenient source in terms of in situ calibration of growth rates and alloy composition by reflection high-energy electron diffraction. As indicated by secondary ion mass spectroscopy, low residual O and C impurity content is obtained by using this source. GaAs quantum well structures have been characterized by photoluminescence spectroscopy and compared to equivalent structures grown by standard solid-source molecular beam epitaxy. They are also compared with the results recently reported in the literature for analogous structures grown by MOMBE using alternate aluminum sources.
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