Vapour phase chemical transport properties of the cadmium telluride-iodine system

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Abstract
The vapour phase chemical transport properties of the CdTe : I2 system have been investigated. By comparing the experimental transport rate with the theoretical transport rate calculated on the basis of a three reaction transport model, it was shown that no iodine chemical transport is possible in closed tubes in the hot-cold direction, but only vapour phase transport controlled by the source sublimation. Thin platelets with large smooth surfaces were observed growing on the source charge under small temperature gradients. Their growth was explained in terms of a reverse (cold-hot) iodine transport associated with a reduced sublimation tendency of the facetted crystallized material with respect to the unfacetted powdered material of the charge

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