Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
As perovskite solar cell (PSC) stability expectancy surpass 1000s of hours, the cost and effort to detect instability in PSC becomes increasingly higher. Accelerated testing could offer a solution by reducing resources needed to advance in preventing the initial stages of degradation, especially if properly related to long-term studies and by use of semi-automated analysis. By suitable experiments, it becomes feasible to track physical and chemical phenomena occurring during the application of stress, and consequences for stability of reversible processes such as ion migration. [1] We have developed in-situ characterization methods to be applied in line with or parallel to ISOS-grade indoor and outdoor operational testing. These include X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS) and photoluminescence (PL). This presentation includes implementations of accelerated stress tests on PSCs under operando conditions, among others applying continuous light irradiation and bias-voltage. The device response with time under bias via in-situ XRD analyses in conjunction with quasi in-situ EIS, demonstrated a clear relation between halide perovskite lattice expansion/constriction, increased ionic motion, current decay with time and device stability. [2] EIS analyses revealed a threshold where some of these bias-induced degradation mechanisms become irreversible. By a combination of detailed characterization, we could elucidate mechanisms of actuation when using additive engineering to passivate shallow defects. [2-4]
This work was supported by the Spanish Ministry of Science, Innovation and Universities (MICIU), the ERDF, and the AEI under the Project No. PID2021-143344OB-I00. This work constitutes part of the Materials Science Ph.D. Program for F.B. at the Universitat Autonoma de Barcelona (UAB, Spain), and the authors acknowledge the Spanish Ministry of Science, Innovation and Universities for providing the predoctoral contract to F.B. with reference No. PRE2020-092669 of the Project No. SEV-2017-0706-20-3. The ICN2 is supported by the Severo Ochoa Centres of Excellence programme, Grant CEX2021-001214-S, funded by MICIU/AEI/10.13039.501100011033. Thanks to Dámaso Torres for his assistance with graphical design.
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