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Excess Arsenic in GaAs Grown at Low Temperatures by Molecular Beam Epitaxy

The structural properties of GaAs grown at low temperatures by molecular beam epitaxy (LTMBE GaAs) were studied. The excess arsenic atoms in LTMBE GaAs exist in the form of arsenic interstitial couples (i.e. two As atoms share the one host site), and cause an increase in the lattice parameter of LTMBE GaAs. Annealing at above 300° C, the arsenic interstitial couples decomposed, and As precipitates formed, resulting in a decrease in the lattice parameter.