We further determine the thermodynamic ionization level of N2 and N3 vacancies by calculating the negative charge state by adding an electron. DFEs provide insights into the thermodynamic stability and formation abilities of specific defects. On the other hand, TILs represent the redox potential associated with the capture of carriers at defect sites. For both defects considered, the (0/-) transition is found to be deep within the band gap, see Table .