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- W2050140598 abstract "Capacitance-voltage, deep level transient spectroscopy (DLTS), and admittance spectroscopy measurements have been performed to characterize a GaAs quantum well confined either by Ga0.57Al0.43As layers or by two GaAs-Ga0.54Al0.46As superlattices. Due to a large capacitance decrease at low temperature, the well response cannot be obtained from DLTS measurements. This capacitance step is related to the thermionic emission from the well to the barrier regions. For the case of the enlarged well in the superlattice, the electron emission takes place towards the conduction miniband. In order to deduce the conduction-band discontinuity, admittance spectroscopy measurements have been applied. The bottom of the superlattice miniband is at 107±10 meV from the GaAs conduction-band minimum. The corresponding band offset deduced from a theoretical calculation is ΔEc=410±10 meV=(0.65±0.02) ΔEg. For the GaAs quantum well in GaAlAs, we measure a conduction-band discontinuity of 0.35 eV between GaAs and GaAlAs that has its minimum at the X point. At the Γ point, the band offset ratio ΔEc/ΔEg is once more confirmed." @default.
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- W2050140598 date "1992-11-01" @default.
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- W2050140598 title "Electrical characterization of a GaAs quantum well confined by GaAlAs layers or by two superlattices" @default.
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- W2050140598 doi "https://doi.org/10.1063/1.352221" @default.
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