Abstract

The effects of stoichiometry on various features of III–V compounds are investigated. Application of the optimum vapour pressure of group V elements is shown to minimize the deviation from stoichiometric composition. The temperature dependence of the optimum vapour pressure is also obtained from both annealing and liquid phase epitaxial growth experiments. Vapour pressure technology is successfully applied to bulk crystal growth. In view of the defect formation mechanism, the role of the stable interstitial As atoms (I As) in GaAs is emphasized. The mechanism of stoichiometry control is discussed on the basis of the equality of chemical potentials and the change in saturating solubility in the liquidus phase as a function of the vapour pressure.

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