24.9 percent efficiency with perovskite/CIS tandem solar cell

Within the framework of the EU project PERCISTAND, which investigates thin-film compounds of perovskites and chalcogenides, a group at the Karlsruhe Institute of Technology (KIT) together with project partners has developed a tandem solar cell of perovskites and copper indium diselenide (CIS) with an efficiency of 24.9 percent. According to a KIT statement, this is a record value for this technology. The material combination also offers potential for use »on vehicles, portable devices, and foldable or rollable devices« because of its light weight and versatility.
The CIS portion of the tandem cell contains almost no gallium, resulting in a narrow bandgap of about 1 electron volt. The bandgap of the perovskite part can also be tuned to this, which is why the compound contains little bromine, making it more efficient and stable than a perovskite layer with a high bromine content. The team, led by Dr. Marco A. Ruiz-Preciado and tenure-track professor Ulrich W. Paetzold, has published its work in the journal ACS Energy Letters.

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