On the role of defect charge state in the stability of point defects in silicon

Abstract Defect annealing in 1-MeV electron-irradiated, phosphorus-doped silicon is studied. Charge state effects are explored directly using a p-n junction structure. A defect state which is associated with the E center (phosphorus-vacancy pair) is found to disappear at approximately 150°C with an activation energy of 0.95 ± 0.03 eV in the neutral charge state and 1.25 ± 0.05 eV in the negative charge state.