Journal
ACS ENERGY LETTERS
Volume 6, Issue 3, Pages 1003-1014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02662
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Funding
- Office of Naval Research [N00014-20-1-2574]
- National Science Foundation [1929019]
- Office of Integrative Activities
- Office Of The Director [1929019] Funding Source: National Science Foundation
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Ion migration in halide perovskite materials significantly impacts various device behaviors, such as light-soaking effect, photocurrent-voltage hysteresis, and slow open-circuit voltage decay. Studies suggest that the built-in electrical field plays a key role in elucidating ion migration and associated device behaviors.
Ion migration is a solid-state electrochemical phenomenon widely observed in the family of halide perovskite materials, which is attributed to their intrinsically soft ionic crystal structures and mixed electronic-ionic conduction properties. Numerous studies in the literature have indicated that ion migration is the major cause of various anomalous device behaviors, including light-soaking effect, photocurrent-voltage hysteresis, and slow open-circuit voltage decay, which are commonly observed in perovskite solar cells. Herein we present a comprehensive review on these studies. We also provide a mechanistic understanding, featuring the built-in electrical field as a key factor for the elucidation of ion migration and associated device behaviors in a consistent manner. Finally, we discuss future research directions toward a better understanding of these phenomena.
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