LT CW-PL spectrum (solid line) of Ge/Si0.15Ge0.85 MQWs with Lz = 8.7 nm. The direct gap related cΓ1-HH1 emission is visible at about 1.01 eV. The zero-phonon cL1-HH1 transition and its phonon replicas are present between 0.7 and 0.8 eV. The linear absorption spectrum (dotted line) is also shown.
Typical decay curve obtained for the zero-phonon cL1-HH1 transition at a lattice temperature T = 14 K.
Decay time of the zero-phonon cL1-HH1 transition as a function of the QW thickness Lz at the lattice temperature T = 14 K.
CW-PL spectra at T = 5 K of two samples with the same well thickness (7.3 nm) and different decay times. The solid line refers to the sample with a longer decay time, and the dashed line to the other sample.
Decay time dependence on the reciprocal temperature. Dots refer to a sample with 7.3 nm QWs, and triangles to a sample with 3.8 nm QWs. Solid lines are guides for the eye.
PL decay of the cΓ1-HH1 direct transition at 10 K (solid line). The laser pulse is also shown (dotted line).
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