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The conduction-band offset ΔEc of Al0.3Ga0.7As/In0.1Ga0.9As0.8P0.2 lattice matched to a GaAs substrate was measured by capacitance-voltage analysis. To examine the transitivity of the band offset in the AlGaAs/InGaP/InGaAsP system, the band offsets of Al0.3Ga0.7As/In0.5Ga0.5P and In0.5Ga0.5P/In0.1Ga0.9As0.8P0.2 were investigated. The value of ΔEc for the Al0.3Ga0.7As/In0.1Ga0.9As0.8P0.2 heterostructure, estimated by adding the measured ΔEc values in Al0.3Ga0.7As/In0.5Ga0.5P and in In0.5Ga0.5P/In0.1Ga0.9As0.8P0.2, agrees well with the value measured directly. We thus conclude that the transitivity rule holds well for the band offsets of an AlGaAs/InGaP/InGaAsP system lattice matched to a GaAs substrate.
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Cho et al. (1996) studied this question.
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