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(a) Absorption spectrum (solid line) and PL spectrum (dashed line) for the MWIR SLS structure at . (b) Modulation response data at various steady-state excitation levels for the MWIR SLS, the excitation area was . The inset shows the reciprocal carrier lifetime obtained from a fit of the PL response as a function of the excess carrier concentration. The minority carrier lifetime of 75 ns at zero excitation was determined at the intersection with the -axis.
Modulation response data at various steady-state excitation levels for the LWIR SLS structure (a) and the MCT structure (b) at ; the excitation areas were and for the LWIR SLS and MCT structures, respectively. The insets show the reciprocal carrier lifetimes obtained from the PL response fitting as a function of the excess carrier concentration. The intersections with the -axis determined the minority carrier lifetimes, for LWIR SLS and for LWIR MCT.
Schematic diagram of the carrier capture: , are the capture times for holes and electrons, ; is the concentration of neutral SRH centers; and is the emitted energy.
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