Publication date: 22nd July 2026
Understanding how mobile ions redistribute within metal halide perovskites is essential for interpreting device stability and quantitative ion-density measurements. While most studies focus on ionic transport along the device stack, lateral ion motion and edge effects remain relatively unexplored, despite their strong relevance and demonstrated impact [1]. Especially in small-area, lab-scale photovoltaic devices, lateral migration can also distort ion density measurements. Furthermore, lateral migration can significantly impact device stability and ageing.
In this talk, I will discuss side collection of ions at device edges and its consequences both for measured ion densities as well as long-term material stability. I will also investigate the impact of device area and shadow masking on device stability. Experimental results are complemented with 2D drift-diffusion simulations performed using ChargeTransport [2].
Finally, I will discuss how the impact of field screening due to mobile ions in textured perovskite solar cells differs from that in planar devices, and whether this might open up opportunities to engineer devices with suppressed ion-induced current losses.
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