It has been proposed that the large discrepancy between the previously measured large bandgap of InN (1.9 eV) and the
recently discovered narrow bandgap could be due to the formation of indium oxynitride alloys in older sputter-grown films, since sputtered films often contained high levels of oxygen contamination that can be over 10% in some extreme cases [10,12]. Assuming a linear composition dependence of the direct bandgap of the alloy formed by InN and In2O3 [11,14].