期刊
NATURE ENERGY
卷 2, 期 9, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2017.135
关键词
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资金
- EPSRC, UK
- European Union Seventh Framework Program under of the MESO project [604032]
- AFOSR [FA9550-15-1-0115]
- EPSRC [EP/M024881/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1659740, EP/M024881/1] Funding Source: researchfish
Perovskite solar cells are remarkably efficient; however, they are prone to degradation in water, oxygen and ultraviolet light. Cation engineering in 3D perovskite absorbers has led to reduced degradation. Alternatively, 2D Ruddlesden-Popper layered perovskites exhibit improved stability, but have not delivered efficient solar cells so far. Here, we introduce n-butylammonium cations into a mixed-cation lead mixed-halide FA(0.83)Cs(0.17)Pb(IyBr1-y)(3) 3D perovskite. We observe the formation of 2D perovskite platelets, interspersed between highly orientated 3D perovskite grains, which suppress non-radiative charge recombination. We investigate the relationship between thin-film composition, crystal alignment and device performance. Solar cells with an optimal butylammonium content exhibit average stabilized power conversion efficiency of 17.5 +/- 1.3% with a 1.61-eV-bandgap perovskite and 15.8 +/- 0.8% with a 1.72-eV-bandgap perovskite. The stability under simulated sunlight is also enhanced. Cells sustain 80% of their 'post burn-in' efficiency after 1,000 h in air, and close to 4,000 h when encapsulated.
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