A review on the role of ion migration in unusual behavior of perovskite solar cells

Showing a rapid increase in conversion efficiency and low-cost fabrication method, perovskite solar cells have attracted significant interest in the photovoltaic research field over the last decade. the main challenge for commercializing them is the instability of photovoltaic characteristics under real operational conditions. A variety of causes, for these instabilities, under different conditions and by the time have been reported. Ion migration in the perovskite layer is known as an important limiting-factor for long term stability. In this paper, we review some unusual behaviors in perovskite solar cells caused by ion migration.