Impurity absorption in CVD ZnSe

Abstract

Fourier transmission spectroscopic and laser calorimetric measurements have been used to characterize bulk and surface impurity bands in CVD ZnSe. Temperature dependence studies indicate that, while absorption between 1200 cm-(l) and 1800 cm-(1) is mainly from bulk molecular impurities, surface impurities also contribute and introduce a departure from the expected exponential dependence of multiphonon absorption with frequency above 850 cm-(1).