A study of optical absorption in HgCdTe layers is presented to provide an improved model for the absorption coefficient. Measurements were performed on samples grown by molecular beam epitaxy using automated compositional control from spectroscopic ellipsometry measurements. Several samples with varying alloy composition and layer thickness were measured at varying temperatures to build an absorption model to represent bandtail and above bandgap absorption. Best-fit parameters for the optical absorption coefficient model are presented as a function of temperature and composition and are compared to previously published models.
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