Abstract
Perovskite-based tandem cells as clean photovoltaic conversion devices drive the transition to decarbonized energy. Recently in <i>Nature</i>, Tan and co-workers report a certified efficiency of 26.4%, a record-setting efficiency in all-perovskite tandem solar cells. High photocurrent density is achieved by ammonium cation passivation, addressing the short carrier diffusion length in thick mixed Pb-Sn narrow-bandgap subcell.
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