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A team around the physicist Dr. Felix Lang from the University of Potsdam, Prof. Lei Meng and Prof. Yongfang Li from the Chinese Academy of Sciences, Beijing, now combine perovskite with organic absorbers to form a record-level tandem solar cell as reported in the scientific journal Nature.

In their work, now published in Nature, Lang and colleagues combine two emerging solar cell technologies, namely perovskite and organic solar cells, that both are processed at low temperatures with a low carbon footprint.

"Still, tandem solar cells were limited by the perovskite layer, which shows strong efficiency losses if adjusted to absorb only blue/green parts of the sun spectrum," he explains.

"To tackle this, we utilized a novel passivation layer applied to the perovskite that reduces material defects and improves the performance of the whole cell."

Northwestern University scientists have developed a new protective coating that significantly extends the life of perovskite solar cells, making them more practical for applications outside the lab.