Journal
NATURE ENERGY
Volume 7, Issue 8, Pages 744-753Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41560-022-01076-9
Keywords
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Funding
- National Key Research and Development Program of China [2019YFE0120000]
- National Natural Science Foundation of China [61875143, 62005188, 62174112, 62120106001]
- Natural Science Foundation of Jiangsu Province [BK20190825]
- Fundamental Research Funds for the Central Universities [YJ2021157, 2021SCU12057, YJ201955]
- Science and Technology Program of Sichuan Province [2020JDJQ0030]
- Engineering Featured Team Fund of Sichuan University [2020SCUNG102]
- Swiss Federal Office of Energy (SFOE)-BFE [SI/501805-01]
- Engineering Research Center of Digital Imaging and Display, Ministry of Education, Soochow University
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A universal close-space annealing strategy is developed to improve the structural and optoelectronic quality of perovskite films, leading to the fabrication of efficient perovskite solar cells and all-perovskite tandem solar cells.
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-E-g) and wide-bandgap (wide-E-g) 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-E-g and wide-E-g 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. Controlling the crystallization of perovskites is not trivial. Here Wang et al. develop a close-space annealing to improve the structural and optoelectronic quality of perovskite films with different chemical compositions, leading to over 25% efficiency in all-perovskite tandem solar cells.
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