The default defect_charge is 1. To my understanding, taking ZnxAl(1-x)O for example, the Al will contribute x electrons. But in ZnO, the carrier concentration is much lower than the estimation from such thinking. Therefore, the defect_charge should be much less than one. Do I understand the definition correctly?
Under such circumstance, how do we define the compensation_factor? Can we still use the default value?
Many thanks in advance.