Perovskite photo voltaic cell efficiency exhibits seasonal variation in long-term discipline check
by Robert Schreiber
Berlin, Germany (SPX) Jul 25, 2025
In a multi-year out of doors research, researchers at Helmholtz-Zentrum Berlin (HZB) have uncovered important seasonal efficiency fluctuations in perovskite photo voltaic cells. Performed on the rooftop of the Adlershof campus, the long-term experiment uncovered varied photo voltaic applied sciences to pure climate situations, focusing specifically on perovskite cells identified for his or her excessive lab efficiencies and low manufacturing prices.
Dr Carolin Ulbrich and Dr Mark Khenkin analyzed 4 years of operational knowledge, revealing that perovskite photo voltaic cells keep glorious effectivity in summer season however expertise notable declines through the winter. The group introduced their findings within the journal Superior Vitality Supplies, marking the longest steady out of doors analysis of perovskite photovoltaics thus far.
Below commonplace check situations, lab-scale perovskite cells have reached efficiencies as much as 26.95%. Whereas industrial variations are rising, understanding real-world efficiency is important for long-term deployment. HZB, along with the College of Ljubljana by means of the TAPAS mission, established an outside rack system to watch encapsulated perovskite cells year-round. The cells, fabricated by Eva Unger’s group, embody a stack with ITO | 2PACz | Cs0.15FA0.85PbI2.55Br0.45 (band hole 1.65 eV) | C60 | SnO2 | Cu.
The info present that peak output held regular throughout the primary two summers, dropping solely 2% between years one and 4. Nonetheless, effectivity declined roughly 30% throughout winter seasons. Researchers attribute this to seasonal adjustments in daylight spectrum at Berlin’s latitude, the place blue mild dominates in summer season and crimson mild in winter. Since perovskite supplies convert blue wavelengths extra effectively, this spectral shift impacts their efficiency.
“Perovskite photo voltaic cells differ from typical PV applied sciences in that their effectivity usually adjustments reversibly inside the day-night cycle,” defined Mark Khenkin. “This dynamic contributes considerably to seasonal variability.”
Doctoral pupil Marko Remec led the information analysis, contributing important insights into how environmental situations have an effect on rising photo voltaic applied sciences in sensible use.
Analysis Report:Seasonality in Perovskite Solar Cells: Insights from 4 Years of Outdoor Data
Associated Hyperlinks
Helmholtz-Zentrum Berlin
All About Solar Energy at SolarDaily.com
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