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In page Perovskite solar cell:

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In November 2022, the all-perovskite tandem efficiency reached a new record of 27.4%.[5] This breaks the 2020 record for 1 cm2 solar cells, and was achieved by a joint team from Northwestern University, University of Toronto, and the University of Toledo. This cell additionally broke the previous record for Voc for all-perovskite tandems.[citation needed] This same cell was certified by NREL with a PCE of 26.3% and a Voc of 2.13V. This marks the “first certified all-perovskite tandem to surpass the record PCE (25.7%) of single-junction perovskite solar cells”. (AUTHOR NAMES ET AL) have found areas for improvement in the Jsc values that put 30% efficiency in the near future.[citation needed]