Publication date: 22nd July 2026
Mobile ions play a crucial role in metal halide perovskites, shaping the device physics of perovskite-based devices such as solar cells or memristors. Although the importance of mobile ions in metal halide perovskites has long been recognised, a comprehensive understanding of ion migration, its driving forces, and its impact on perovskite solar cell performance is still lacking.
In this talk, I will discuss how mobile ions influence the device physics of perovskite solar cells, and impact device performance. I will demonstrate how field screening due to mobile ions leads to inefficient charge extraction, which eventually causes current losses [1]. Thereafter, I will discuss ageing and recovery of perovskite solar cells, identifying an increase in mobile ion density as a dominant factor in the early performance degradation of perovskite solar cells [2], and demonstrating that this process may be (partially) reversible [3].
Finally, I will explore how different device parameters, such as transport layer properties, interfaces, and device architecture influence ionic losses, offering a perspective on pathways towards engineering more stable perovskite solar cells.
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