Electrical characterization of partially relaxed InxGa1−xAs/GaAs multiple quantum well structures

The temperature dependence of the spatial resolution of capacitance-voltage (C−V) profiles in the compositional quantum well (CQW) is investigated. The apparent carrier distribution (ACD) peak in the In0.2Ga0.8As/GaAs single QW is observed to show a strong temperature dependence, compared to that in Si δ-doped GaAs. The ACD peak in CQW is wider (narrower) than the spatial extent of ground-state wave function at high (low) temperatures. The self-consistent numerical simulations on the carrier distribution show that the full width at half maximum of ACD peak in CQW is mainly affected by the debye averaging process at high temperatures and the change in the position expectation value of the two-dimensional electrons at low temperatures. This change in the position expectation value is found to be much smaller than the spatial extent of ground-state electron wave function.

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Electrical characterization of partially relaxed InxGa1−xAs/GaAs multiple quantum well structures

Cited by 7 publications

References 17 publications

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Differential capacitance as a method of determining the presence of a quasi-bidimensional electronic gas

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Spatial resolution of capacitance-voltage profiles in quantum well structures

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