Surface chemical polishing and passivation minimize non-radiative recombination for all-perovskite tandem solar cells

Yongyan Pan, Jianan Wang, Zhenxing Sun, Jiaqi Zhang, Zheng Zhou, Chenyang Shi, Sanwan Liu, Fumeng Ren, Rui Chen, Yong Cai, Huande Sun, Bin Liu, Zhongyong Zhang, Zhengjing Zhao, Zihe Cai, Xiaojun Qin, Zhiguo Zhao, Yitong Ji, Neng Li, Wenchao Huang, Zonghao Liu () and Wei Chen ()
Additional contact information
Yongyan Pan: Huazhong University of Science and Technology
Jianan Wang: Huazhong University of Science and Technology
Zhenxing Sun: Huazhong University of Science and Technology
Jiaqi Zhang: Huazhong University of Science and Technology
Zheng Zhou: Huazhong University of Science and Technology
Chenyang Shi: Huazhong University of Science and Technology
Sanwan Liu: Huazhong University of Science and Technology
Fumeng Ren: Huazhong University of Science and Technology
Rui Chen: Huazhong University of Science and Technology
Yong Cai: Huazhong University of Science and Technology
Huande Sun: Huazhong University of Science and Technology
Bin Liu: Wuhan University of Technology
Zhongyong Zhang: Wuhan University of Technology
Zhengjing Zhao: Huaneng Clean Energy Research Institute
Zihe Cai: Huaneng Clean Energy Research Institute
Xiaojun Qin: Huaneng Clean Energy Research Institute
Zhiguo Zhao: Huaneng Clean Energy Research Institute
Yitong Ji: Wuhan University of Technology
Neng Li: Wuhan University of Technology
Wenchao Huang: Wuhan University of Technology
Zonghao Liu: Huazhong University of Science and Technology
Wei Chen: Huazhong University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract All-perovskite tandem solar cells have shown great promise in breaking the Shockley–Queisser limit of single-junction solar cells. However, the efficiency improvement of all-perovskite tandem solar cells is largely hindered by the surface defects induced non-radiative recombination loss in Sn–Pb mixed narrow bandgap perovskite films. Here, we report a surface reconstruction strategy utilizing a surface polishing agent, 1,4-butanediamine, together with a surface passivator, ethylenediammonium diiodide, to eliminate Sn-related defects and passivate organic cation and halide vacancy defects on the surface of Sn–Pb mixed perovskite films. Our strategy not only delivers high-quality Sn–Pb mixed perovskite films with a close-to-ideal stoichiometric ratio surface but also minimizes the non-radiative energy loss at the perovskite/electron transport layer interface. As a result, our Sn–Pb mixed perovskite solar cells with bandgaps of 1.32 and 1.25 eV realize power conversion efficiencies of 22.65% and 23.32%, respectively. Additionally, we further obtain a certified power conversion efficiency of 28.49% of two-junction all-perovskite tandem solar cells.

Date: 2024
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DOI: 10.1038/s41467-024-51703-0

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