Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO26)
Publication date: 22nd April 2026
Understanding the degradation mechanisms of perovskite solar cells (PSCs) remains a critical challenge limiting their large-scale deployment despite their outstanding power conversion efficiencies. This talk will cover a comprehensive investigation of PSC degradation pathways by combining in-situ X-ray diffraction (XRD) and impedance spectroscopy (IS), enabling simultaneous structural and electronic characterization under realistic operating conditions.
In-situ XRD reveals the dynamic evolution of the perovskite lattice during device operation, highlighting phase instability, strain accumulation, and the formation of degradation products. These structural changes are strongly influenced by external stressors such as light, electrical bias, and environmental exposure, which are known to accelerate ion migration and defect redistribution within the perovskite layer. Complementarily, impedance spectroscopy provides insight into the evolution of charge transport and recombination processes, capturing changes in capacitance, resistance, and ionic contributions that are directly linked to device performance losses.
By correlating structural and electrical signatures, we identify a multi-step degradation process governed by the interplay between ionic migration, interfacial reactions, and bulk defect formation. The results reveal that early-stage degradation is dominated by reversible ionic redistribution, while prolonged operation leads to irreversible structural decomposition and increased non-radiative recombination. Importantly, discrepancies between structural stability and operational stability are observed, underscoring the critical role of interfaces and mobile ions in determining device lifetime.
This combined operando approach provides a unified framework to disentangle the complex coupling between structural and electronic degradation pathways in PSCs. Overall, this work demonstrates the power of in-situ characterization to advance the understanding of degradation phenomena in next-generation photovoltaic technologies.
The authors acknowledge the Spanish Ministry of Science and Innovation for the predoctoral contract to F. B. with Reference No. PRE2020-092669 of the Project No. SEV-2017-0706-20-3 and the contract of N. V. with ref. PRE2022-103001 of the project CEX2021-001214-S-20-6. This work constitutes part of the Materials Science PhD Program for F. B., N. V. and Z. T. at the Universitat Autonoma de Barcelona (UAB, Spain). This project was funded by the project PerMXSol (ref. PID2022-143344OB-I00), project TAMPOPO, (ref. PID2021-122349OAI00) and project SPOT-IT (ref. PCI2023-146003-2) funded by MCIN/AEI/10.13039/501100011033 and “ERDF A way of making Europe”, co-financed by the European Union. ICN2 is funded by the CERCA Programme/Generalitat de Catalunya. Thanks to Agencia de Gestio d’Ajuts Universitaris i de Recerca for Grant No. SGR 01617 and the Xarxa d’ R + D + I Energy for Society. The ICN2 is supported by the Severo Ochoa Centres of Excellence programme, Grant CEX2021-001214-S, funded by MCIN/AEI/10.13039.501100011033.
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