“…Reported intrinsic factors include A-site defects, oxygen vacancies, lattice strain, crystallographic orientation, B-site defects, and phase transitions, while external factors include oxygen partial pressure, temperature, reduction time, and electrochemical driving, among others. 38–41 Considering the current need for additional comprehensive reviews on intrinsic factors influencing perovskite exsolution, especially for extensively reported factors such as A-site defects, oxygen vacancies, lattice strain, and phase transitions, these could serve as effective entry points for understanding the structure–performance relationship and exploring exsolution mechanisms.…”