Recently, the research group led by Professor Tan Hairen at the College of Engineering and Applied Sciences, Nanjing University, made a breakthrough in the field of large-area all-perovskite tandem solar cells. After testing by an internationally recognized third-party certification organization, the steady-state photovoltaic conversion efficiency reached an impressive 24.5%, setting a new world record for the efficiency of all-perovskite tandem solar cells. This achievement establishes a technological foundation for the mass production and commercial application of all-perovskite tandem solar cells. The relevant research results were published on February 23, 2024, under the title "Homogeneous crystallization and buried interface passivation for perovskite tandem solar modules" in the journal Science (https://doi.org/10.1126/science.adj6088).

The abstract of the article is as following:

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.