24.5%! Breakthrough in Conversion Efficiency of Large Area Full Perovskite Tandem Solar Cells by Tan at Nanjing University

PVTIME – A high conversion efficiency of 24.5% on large-size all-perovskite tandem solar cells was recently achieved by the research group led by Professor Tan Hairen at Nanjing University. And the result, as a new world record for the efficiency of all-perovskite tandem solar cells, has been confirmed by an international third-party testing institute and is considered to be the technological basis for the mass production of all-perovskite tandem solar products.

The latest research results were published on 23 February 2024 in the journal Science under the title “Homogeneous crystallization and buried interface passivation for perovskite tandem solar modules” (https://doi.org/10.1126/science.adj6088). The abstract is as follows:

Scalable fabrication of all-perovskite tandem solar cells is challenging because the narrow-bandgap subcells made of mixed lead-tin (Pb-Sn) perovskite films suffer from nonuniform crystallization and inferior buried perovskite interfaces. We used a dopant from Good’s list of biochemical buffers, aminoacetamide hydrochloride, to homogenize perovskite crystallization and used it to extend the processing window for blade-coating Pb-Sn perovskite films and to selectively passivate defects at the buried perovskite interface. The resulting all-perovskite tandem solar module exhibited a certified power conversion efficiency of 24.5% with an aperture area of 20.25 square centimeters.

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