Abstract
It has been found that besides temperature conditions, source-material composition (phase purity, impurity concentration and non-stoichiometry) dominates the quality of ZnSe crystals due to mass transport limitations and fluctuations. Therefore, without definite pretreatment, commercially supplied ZnSe source material is unsuitable for the physical vapour growth of ZnSe in closed systems. In this work the results of various characterization methods have been closely related to the optimal source preparation. For characterization of the non-stoichiometry of crystals, a qualitative relation between colour and zinc vacancy concentration has been established.
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