NREL researchers improve efficiency and stability of tandem perovskite cells

A team at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) has developed a tandem solar cell made of two layers of perovskite with an efficiency of 25.5 percent. The stability of the cell was also significantly improved compared to similar developments.
However, this was achieved for a combination of the perovskites with tin and lead; the use of the heavy metal is a problem for most perovskite cell assemblies. In addition, although the stability achieved is comparatively high for this technology, at only 80 percent of the efficiency after 1,500 hours (a good 62 days), it is still far from commercial usability.
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