A chemistry tweak helps perovskite solar cells reach 29.63% efficiency
Researchers used a precursor additive called CGBA to control how wide-bandgap perovskite films formed. The resulting cell reached 21.43% efficiency, while an all-perovskite tandem reached 29.63%; unencapsulated target devices retained 93% of their starting efficiency after 4,500 hours in nitrogen.
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