Harnessing ion migration in halide perovskites: Implication and applications

Ion migration in halide perovskites (HPs) has traditionally been viewed as a challenge to overcome, often associated with device instability and degradation. However, recent advancements indicate that ion migration, when precisely controlled, can be harnessed to enable dynamic and reconfigurable functionalities in advanced electronic devices. This review redefines the role of ion migration in HPs, exploring its mechanisms and implication as a multifaceted approach for innovation rather than a limitation to mitigate. We outline the impacts of its dual role and strategies to harness ion migration in HPs. Finally, we highlight the applications of ion migration in advanced technologies and provide a forward-looking perspective on its pivotal role in next-generation devices including memristors for data storage and neuromorphic computing. • Controlled ion migration enables reconfigurable properties in halide perovskites. • Neuromorphic devices rely on precise modulation of ion migration. • Combining control strategies enables applications in memory and neuromorphic systems. • Uncontrolled ion migration in halide perovskites leads to stability issues.