Optical Absorption Edge in CdTe: Experimental

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Abstract
Optical absorption in CdTe single crystals is reported for photon energies just below the transmission limit at about 1.5 eV at several temperatures between 2 and 300°K. Chemical removal of damaged surface layers was required to obtain concordant results from mechanically polished samples of different thicknesses. At the lowest temperatures, impurity bands dominated the absorption in all crystals except those taken from the purest parts of zone-refined ingots. The intrinsic absorption edge observed in such crystals was considerably sharper than previously reported. In contrast with the earlier data, the energy and temperature dependence of this intrinsic absorption could not be explained as resulting from indirect interband or indirect exciton transitions.

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