Free Energies and Equilibrium States of Mono- and Bi-Layer Superstructures of III-V Ternary Alloy Semiconductors

概要

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Equations for the free energies of mono- and bi-layer superstructures of III-V ternary alloy systems were derived as functions of the order parameter ψ (random atom arrangement when ψ=0 and a complete ordered arrangement when ψ=1). It was assumed in the analysis that mixing enthalpy was a strain energy caused by mixing. By minimizing the free energy, we obtained the value of ψ at the equilibrium state. The values are larger than zero for monolayer superstructures on (100) and (110) surfaces below certain temperatures. For monolayer superstructures on a (111) surface, the stable states are at ψ=0, i.e., random arrangements at all temperatures. Bilayer superstructures are less stable than monolayer superstructures of the corresponding surface orientation.
社団法人応用物理学会の論文
1986-07-20