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Modulation doped InxGa1−xAs/In0.52Al0.48As/InP structures were grown by molecular-beam epitaxy with x values between 53% and 70%. For pseudomorphic cases, graded instead of abrupt interfaces were used. Hall mobility and persistent photoconductivity measurements as a function of temperature were used to characterize samples with different structural parameters. Consistent trends in the variation of mobilities and two-dimensional carrier concentration (n2D ) under light and dark conditions have been observed and discussed in terms of applicable scattering mechanisms. The Hall mobilities are comparable to the best results obtained to date but with significantly higher n2D concentration.
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Peng et al. (1987) studied this question.
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