Abstract
Based on the modification of the simplified coherent potential approximation (SCPA), a model is developed to calculate the composition dependence of the band gap energy of III-V ternary alloys with the same anion. The derived equation is used to fit the experimental band gap energy of InxAl1−xN, InxGa1−xN and AlxGa1−xN with x from 0 to 1. It is found that the fitting results are better than those done by using SCPA. The fitting results are also better than those obtained by using the formula with a small bowing coefficient, especially for InxAl1−xN. In addition, our model can also be used to describe the composition dependence of band gap energy of other III-V ternary alloys.
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