D. S. Romanovskiy, A. Solomonov, S. Tarasov, I. Lamkin, G. Galiev, S. Pushkarev
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引用次数: 0
Abstract
Low-temperature photoluminescence and photoreflectance have been studied in several metamorphic HEMT (MHEMT) heterostructures with the In0.7Ga0.3As active regions and different buffer layer designs. It was found that structures with step-graded metamorphic buffer have better quality. Also it was shown that mismatched superlattices in metamorphic buffer can influence on the half-width of photoluminescence spectra. The possible attribution of photoluminescence spectral lines and their thermal behaviour are critically discussed. The photoreflectance spectrum shows a lot of features in energy region, where none of PL features observed.
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