Impact of Light Soaking on the Electrical Behavior and Charge Dynamics of Perovskite Solar Cells

Perovskite solar cells (PSCs) have emerged as a highly promising technology for next-generation photovoltaics due to their rapidly increasing power conversion efficiencies. However, ensuring long-term operational stability and reliable scale-up remains a critical challenge for their practical deployment. This thesis focuses on the electro-optical characterization of FAPbI3 single cells and mini-modules subjected to continuous light soaking under different electrical bias conditions: Maximum Power Point Tracking (MPPT), Short Circuit (SC) and Open Circuit (OC). A temperature-dependent characterization is performed to decouple thermal effects from intrinsic degradation kinetics. Data analysis tracks the evolution of key photovoltaic parameters and I-V curve anomalies, with a specific focus on the S-shape distortion. The results demonstrate that device stability is heavily bias and architecture dependent. MPPT proved to be the most stable condition for both architectures; conversely, OC bias severely degrades single cells by accelerating interfacial charge accumulation, which progressively intensifies the S-shape barrier. For mini-modules, SC emerges as the worst-case scenario, triggering severe degradation due to current mismatch that forces the weakest cells into reverse bias. Ultimately, this work highlights that while the perovskite bulk remains relatively stable, future development must prioritize interface engineering and precise sub-cell current matching to prevent localized failures during module scale-up.