Low-bandgap mixed tin–lead iodide perovskites with reduced methylammonium for simultaneous enhancement of solar cell efficiency and stability

Chongwen Li, Zhaoning Song (), Cong Chen, Chuanxiao Xiao, Biwas Subedi, Steven P. Harvey, Niraj Shrestha, Kamala Khanal Subedi, Lei Chen, Dachang Liu, You Li, Yong-Wah Kim, Chun-sheng Jiang, Michael J. Heben, Dewei Zhao, Randy J. Ellingson, Nikolas J. Podraza, Mowafak Al-Jassim and Yanfa Yan ()
Additional contact information
Chongwen Li: The University of Toledo
Zhaoning Song: The University of Toledo
Cong Chen: The University of Toledo
Chuanxiao Xiao: Materials Science Center, National Renewable Energy Laboratory
Biwas Subedi: The University of Toledo
Steven P. Harvey: Materials Science Center, National Renewable Energy Laboratory
Niraj Shrestha: The University of Toledo
Kamala Khanal Subedi: The University of Toledo
Lei Chen: The University of Toledo
Dachang Liu: The University of Toledo
You Li: The University of Toledo
Yong-Wah Kim: The University of Toledo
Chun-sheng Jiang: Materials Science Center, National Renewable Energy Laboratory
Michael J. Heben: The University of Toledo
Dewei Zhao: The University of Toledo
Randy J. Ellingson: The University of Toledo
Nikolas J. Podraza: The University of Toledo
Mowafak Al-Jassim: Materials Science Center, National Renewable Energy Laboratory
Yanfa Yan: The University of Toledo

Nature Energy, 2020, vol. 5, issue 10, 768-776

Abstract: Abstract High-performance perovskite/perovskite tandem solar cells require high-efficiency and stable low-bandgap perovskite subcells. State-of-the-art low-bandgap mixed tin–lead iodide perovskite solar cells exhibit either a high power-conversion efficiency or improved stability, but not both. Here we report a two-step bilayer interdiffusion growth process to simultaneously meet both requirements for formamidinium-based low-bandgap mixed tin–lead iodide perovskite solar cells. The bilayer interdiffusion growth process allows for the formation of high-quality and large-grained perovskite films with only 10 mol% volatile methylammonium. Additionally, one-dimensional pyrrolidinium perovskite was applied to passivate the perovskite film and improve the junction quality, which resulted in a carrier lifetime of 1.1 μs and an open circuit voltage of 0.865 V for our perovskite film and device with a bandgap of 1.28 eV. Our strategies enabled a power-conversion efficiency of 20.4% for low-bandgap perovskite solar cells under AM 1.5G illumination. More importantly, an encapsulated device can retain 92% of its initial efficiency after 450 h of continuous 1 sun illumination.

Date: 2020
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DOI: 10.1038/s41560-020-00692-7

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