Perovskiet solar cell performance shows seasonal variation in long -term field test
In a multi-year outdoor research, researchers from Helmholtz-Zentrum Berlin (HZB) have discovered significant seasonal fluctuations in Perovskiet solar cells. Led on the roof of the Adlershof campus, the long-term experiment exposed different solar technologies to natural weather conditions, in particular aimed at perovskiet cells that are known for their high laboratory efficiency and low production costs.
Dr. Carolin Ulbrich and Dr. Mark Khenkin have analyzed operational data for four years, which shows that perovskiet solar cells retain excellent efficiency in the summer, but experience remarkable falls in the winter. The team presented their findings in the magazine Advanced Energy Materials and marked the longest continuous outdoor evaluation of Perovskite -Photovoltaic so far.
Under standard test conditions, Lab scale has achieved perovskiet cells efficiency up to 26.95%. Although commercial versions are on the rise, understanding practical performance is essential for long -term implementation. HZB, together with the University of Ljubljana via the Tapas project, founded an outdoor rack system throughout the year to check encapsulated perovskiet cells. The cells, manufactured by the Eva Unger group, contain a stack with ITO | 2pacz | CS0.15FA0.85PBI2.55BR0.45 (Band Gap 1.65 EV) | C60 | SNO2 | Cu.
The data shows that Piekoutput remained stable over the first two summers and only 2% fell between the years one and four. However, efficiency fell around 30% during the winter seasons. Researchers attribute this to seasonal changes in the sunlight spectrum on the Berlin latitude, where blue light dominates in the summer and red light in the winter. Since perovskiet materials turn blue wavelengths more efficiently, this spectral shift influences their performance.
“Perovskiet solar cells differ from conventional PV technologies because their efficiency often changes reversible within the day cycle,” explains Mark Khenkin. “This dynamic contributes considerably to seasonal variability.”
Doctorate student Marko Remec led the data evaluation and contributed essential insights into how environmental conditions influence up -and -coming solar technologies in practical use.
Research report:Seasonalness in Perovskiet Solar cells: Insights from 4 years of outside data
