Abstract
Direct measurements of the photoconductive decay time τ for samples of Pb 0.8Sn 0.2Te with carrier concentration in the 10 16–10 17 cm −3 range yield values of τ which are longer near the low temperature range investigated ( $ ̃ 14 K) than predicted by a simple band-to-band radiative recombination model. It is suggested that the lifetime enhancement by about two orders of magnitude is the result of photon recycling. Near the upper temperature range ( $ ̃ 100K.) τ's are generally longer than predicted by the theory of the multi-valley Auger process, have a steeper temperature dependence and do not depend strongly on carrier concentration. It appears that the theory either overestimates the recombination rate or that strains in the samples reduce the importance of the process.
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