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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Band diagram of a p-GaAs/pAl0.2Ga0.8As heterojunction. (Right) band diagram of a p-GaAs/pGa0.5In0.5P heterojunction. In both cases the doping level is constant throughout the heterojunction and equals NA = 2 × 1018 cm−3.