Journal
SCIENCE
Volume 363, Issue 6424, Pages 265-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau5701
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Funding
- National Natural Science Foundation of China [91733301, 51672008, 51722201, 21425101, 21331001, 21621061, 51673025]
- MOST of China [2014CB643800]
- National Key Research and Development Program of China [2017YFA0206701, 2017YFA0205101, 2016YFB0700700]
- Beijing Natural Science Foundation [4182026]
- Beijing Municipal Science and Technology Project [Z181100005118002]
- Young Talent Thousand Program
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The components with soft nature in the metal halide perovskite absorber usually generate lead (Pb)degrees and iodine (I)degrees defects during device fabrication and operation. These defects serve as not only recombination centers to deteriorate device efficiency but also degradation initiators to hamper device lifetimes. We show that the europium ion pair Eu3+-Eu2+ acts as the redox shuttle that selectively oxidized Pb degrees and reduced I degrees defects simultaneously in a cyclical transition. The resultant device achieves a power conversion efficiency (PCE) of 21.52% (certified 20.52%) with substantially improved long-term durability. The devices retained 92% and 89% of the peak PCE under 1-sun continuous illumination or heating at 850 degrees C for 1500 hours and 91% of the original stable PCE after maximum power point tracking for 500 hours, respectively.
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