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Phovotovoltaic devices based on organic-inorganic hybrid metal halide perovskites have attracted much attention due to the rapid improvement of their power conversion efficiency from 3.8% to over 25%. Their advantages include ease of fabrication, high light absorption, good charge carrier mobility, tunable bandgap, and low cost. Despite these advantages, their operational stability remains a major obstacle for their commercialization.

We use concentrated natural sunlight for accelerated studies of lifetime and light-induced degradation and compare it to outd​oor stability characterization, using an experimental methodology with independent control of sunlight intensity, the sample temperature and environment during the exposure. 

Our studies of perovskite PV materials showed a strong dependence of the stability on the materials composition, correlated with chemical bond strength, crystalline structures and defect density. Studies of device stability revealed a combination of various degradation mechanisms, where different mechanisms dominate at different conditions of applied bias, light intensity and ambient. The elucidated photo-degradation mechanisms allow us to propose methodologies to enhance device stability.

  • Kant Gupta, D. K. Kumar, V. Sudhakar, J. M. Beckedahl, A. Abate, E. A. Katz, I. Visoly-Fisher, Seasonal effects on outdoor stability of perovskite solar cells, Advanced Energy Materials (2024) 2403844. https://doi.org/10.1002/aenm.202403844.
  • Eshed, I. Visoly-Fisher, Comparison of encapsulation methods of perovskites solar cells via analysis of a large dataset, Journal of Physics Energy 7 (2025), 035006 https://doi.org/10.1088/2515-7655/adccf9.
  • Kouroudis, K. Tabah Tanko, A. Ben Ali, D. Kishore Kumar, V. Sudhakar, R. Kant Gupta, M. Karimipour, I. Visoly-Fisher*, M. Lira-Cantu*, A. Gagliardi*, Artificial intelligence-based, wavelet aided prediction of long-term outdoor performance of perovskite solar cells, ACS Energy Letters 9 (2024) 1581–1586. https://pubs.acs.org/doi/10.1021/acsenergylett.4c00328
  • V. Khenkin et al., Bias-Dependent Degradation of Various Solar Cells: Lessons for Stability of Perovskite Photovoltaics, Energy & Environmental Science, 12 (2019), 550 – 558 https://doi.org/10.1039/C8EE03475C
  • M. Anoop et al., Bias-Dependent Stability of Perovskite Solar Cells Studied Using Natural and Concentrated Sunlight, Solar RRL, 4 (2019) 1900335 https://doi.org/10.1002/solr.201900335