A universal close-space annealing strategy towards high-quality perovskite absorbers enabling efficient all-perovskite tandem solar cells

Changlei Wang, Yue Zhao, Tianshu Ma, Yidan An, Rui He, Jingwei Zhu, Cong Chen, Shengqiang Ren, Fan Fu (), Dewei Zhao () and Xiaofeng Li ()
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Changlei Wang: Soochow University
Yue Zhao: Soochow University
Tianshu Ma: Soochow University
Yidan An: Soochow University
Rui He: Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education
Jingwei Zhu: Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education
Cong Chen: Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education
Shengqiang Ren: Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education
Fan Fu: Laboratory for Thin Films and Photovoltaics, Empa—Swiss Federal Laboratories for Materials Science and Technology
Dewei Zhao: Sichuan University, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education
Xiaofeng Li: Soochow University

Nature Energy, 2022, vol. 7, issue 8, 744-753

Abstract: Abstract The broad bandgap tunability of organic–inorganic metal halide perovskites enables the fabrication of multi-junction all-perovskite tandem solar cells with ultra-high power conversion efficiencies (PCEs). Controllable crystallization plays a crucial role in the formation of high-quality perovskites. Here we report a universal close-space annealing strategy that increases grain size, enhances crystallinity and prolongs carrier lifetimes in low-bandgap (low-Eg) and wide-bandgap (wide-Eg) perovskite films. By placing the intermediate-phase perovskite films with their faces towards solvent-permeable covers during the annealing process, high-quality perovskite absorber layers are obtained with a slowed solvent releasing process, enabling fabrication of efficient single-junction perovskite solar cells (PVSCs) and all-perovskite tandem solar cells. As a result, the best PCEs of 21.51% and 18.58% for single-junction low-Eg and wide-Eg PVSCs are achieved and thus ensure the fabrication of 25.15% efficiency 4-terminal and 25.05% efficiency 2-terminal all-perovskite tandem solar cells.

Date: 2022
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DOI: 10.1038/s41560-022-01076-9

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