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We present ab initio calculations of the electronic structure and the optical properties of InxGa1–xN. They are completed by studies of the strain influence on the alloys. The results are critically discussed in the light of recent experiments. We find an energy gap of InN < 1 eV and a nonparabolic absorption edge. The strong variation of the alloy gap with the In molar fraction is described by a composition-dependent bowing parameter. The tendency of spinodal decomposition is suppressed by biaxial strain. Its extent depends on the realization of strain accommodation.
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Bechstedt et al. (2003) studied this question.
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