Decrease in Quasi Vacancy Formation Energy in the Study of Pair Diffusion Model of Group V Impurities in Silicon

Abstract
When the impurity concentration is high, every vacancy is under the influence of impurity atoms and the vacancy formation energy appears to decrease due to the interaction between a vacancy and two impurity atoms. Since the vacancy formation energy is defined under the condition of no influence of impurity, the decrease is called a decrease in quasi vacancy formation energy, showing that a vacancy is under the influence of impurity atoms.