KAUST study in Nature Energy reports yearlong outdoor stability for perovskite silicon tandem mini modules
Priya Nair ·
Researchers at King Abdullah University of Science and Technology reported on Wednesday that perovskite silicon tandem mini modules maintained most of their initial performance after a full year of outdoor operation in coastal desert conditions. The study, published in Nature Energy and led by Professor Stefaan De Wolf at KAUST’s Solar Center, pairs real world data from Thuwal, Saudi Arabia with results from industry standard accelerated stress tests to assess durability.
The work targets a central barrier to commercialization. Tandems have posted record efficiencies in the lab, but uncertainty over long term stability under heat, humidity, and ultraviolet exposure has slowed plans for high volume production.
The team fabricated encapsulated mini modules based on a wide bandgap perovskite top cell integrated on industrial crystalline silicon. Devices underwent IEC 61215 style damp heat at 85 degrees Celsius and 85 percent relative humidity, thermal cycling, and ultraviolet preconditioning, then were deployed outdoors for continuous monitoring through seasonal extremes.
Materials choices focused on known failure modes. The perovskite absorber used mixed cations and halides to improve phase stability, while surface passivation and an inorganic hole transport layer aimed to reduce ion migration and moisture sensitivity. Edge seals and barrier films limited ingress of water and oxygen.
According to the paper, modules retained high fractions of initial power conversion efficiency across the test window, with degradation rates that align with early warranty targets for pilot products. The authors report that performance loss correlated with specific stressors, notably humidity excursions and ultraviolet dose, and that failures were mitigated by encapsulation and contact stack design rather than changes in the perovskite composition alone.
The methodology is as important as the headline figures. By co analyzing outdoor IV traces, photoluminescence mapping, and electrochemical impedance with results from controlled stress chambers, the group identifies which degradation pathways dominate under field relevant conditions. That allows manufacturers to prioritize process controls, such as moisture barrier quality and interlayer chemistry, before line scale up.
Nature Energy lists collaborators from KAUST’s Solar Center and reliability specialists with experience qualifying silicon modules. The paper does not claim utility scale readiness, and it is limited to mini module formats, not full area panels. It offers a reproducible protocol and data that investors and insurers can use to evaluate risk as pilot lines ramp.
For the solar industry, which is investing in tandem pilots in Europe and China while managing oversupply in conventional silicon, this kind of bankability evidence is the gating item for procurement decisions. If independent labs and manufacturers replicate these durability trends at larger formats, perovskite silicon tandems could move from showcase lines to qualified products in niches where higher efficiency offsets balance of system costs.