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• W2046393487 startingPage "1407" @default.
• W2046393487 abstract "The systematic study of band‐edge luminescence in pseudomorphic Si/Si1−xGex/Si double‐heterostructure layers is reported for a wide composition range, 0.12<x<0.24, for the first time. An analytical expression for the exciton energy gap at 4.2 K valid for x<0.24 is derived from the no‐phonon line energies: ESX(x) = 1.155−0.874x+0.376x2 eV. Addition of an expression for the exciton binding energy provides an approximation for the energy difference between the alloy valence band and the lowest conduction‐band edge at low temperature. An exciton upshift of 16.9 meV due to quantum confinement is observed in a 6.3‐nm Si0.83Ge0.17 alloy well. This is consistent with either type‐I or type‐II band alignment for which the conduction‐band offset has a magnitude ‖ΔEc‖ ≤ 10 meV. The excitonic hole is closely confined in the alloy but the spectra suggest that the electron density in the silicon barriers is increased for the thin layer." @default.
• W2046393487 created "2016-06-24" @default.
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• W2046393487 date "1992-02-01" @default.
• W2046393487 modified "2023-09-27" @default.
• W2046393487 title "Near‐band‐gap photoluminescence from pseudomorphic Si_1−<i>x</i>Ge_<i>x</i>single layers on silicon" @default.
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• W2046393487 doi "https://doi.org/10.1063/1.351262" @default.
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