Journal
SCIENCE
Volume 354, Issue 6314, Pages 861-865Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf9717
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Funding
- Graphene Flagship [696656 - GrapheneCore1]
- Leverhulme Trust [RL-2012-001]
- UK Engineering and Physical Sciences Research Council [EP/J009857/1, EP/M020517/1]
- European Union [239578, 604032]
- Marie Sklodowska Curie International Fellowship [H2O2IF-GA-2015-659225]
- IMEC (Leuven)
- Hasselt University
- U.S. Office of Naval Research
- EPSRC [EP/J009857/1, EP/L024667/1, EP/M020517/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M020517/1, 1507362, EP/L024667/1, EP/J009857/1] Funding Source: researchfish
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We demonstrate four-and two-terminal perovskite-perovskite tandem solar cells with ideally matched band gaps. We develop an infrared-absorbing 1.2-electron volt band-gap perovskite, FA(0.75)Cs(0.25)Sn(0.5)Pb(0.5)I(3), that can deliver 14.8% efficiency. By combining this material with a wider-band gap FA(0.83)Cs(0.17)Pb(I0.5Br0.5)(3) material, we achieve monolithic two-terminal tandem efficiencies of 17.0% with > 1.65-volt open-circuit voltage. We also make mechanically stacked four-terminal tandem cells and obtain 20.3% efficiency. Notably, we find that our infrared-absorbing perovskite cells exhibit excellent thermal and atmospheric stability, not previously achieved for Sn-based perovskites. This device architecture and materials set will enable all-perovskite thin-film solar cells to reach the highest efficiencies in the long term at the lowest costs.
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