Publication date: 15th December 2025
Impedance-based techniques are widely used to investigate the behavior of operating perovskite solar cells (PSCs), particularly for assessing ionic migration and its influence on device performance and stability. In this work, we use transient single-frequency capacitance measurements to demonstrate that inter-pixel photo-potential coupling produces long-range in-plane ionic changes that propagate far beyond the illuminated region, affecting neighboring pixels at distances greater than 2500 μm. This finding reveals that ionic redistribution in PSCs can extend over unexpectedly large spatial scales, challenging the typical assumption that ionic motion remains confined to the directly perturbed region. We further apply this mechanism to analyze the impact of incorporating PbS quantum dots as a bulk heterojunction material, showing how their presence modifies the electrical properties and ionic response of the devices. The sensitivity of this method enables us to detect subtle variations in interfacial charge accumulation and ion–electron interactions. Overall, our results highlight photo-potential coupling as a powerful diagnostic tool for probing long-range ionic dynamics in PSCs and for evaluating material modifications.
AFVF acknowledges FAPESP grants 2023/10395-4 and 2024/05914-5. AFN acknowledges FAPESP (2017/11986-5),
Shell, and ANP (Brazil). JT acknowledges the grant PRE2020-093444 funded by MCIN/AEI/10.13039/501100011033 and by “ESF Investing in your future”.
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