Oxygen vacancies are energetically favored at BiFeO3 ferroelectric domain walls by up to 0.3 eV, boosting equilibrium wall-vacancy concentrations and creating polaronic intragap states that promote n-type domain-wall conduction.
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Thermodynamic stabilization and electronic effects of oxygen vacancies at BiFeO$_3$ neutral ferroelectric domain walls
Oxygen vacancies are energetically favored at BiFeO3 ferroelectric domain walls by up to 0.3 eV, boosting equilibrium wall-vacancy concentrations and creating polaronic intragap states that promote n-type domain-wall conduction.