期刊
ACS ENERGY LETTERS
卷 2, 期 10, 页码 2424-2429出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00729
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资金
- Energy oriented Centre of Excellence (EoCoE) within the Horizon of the European Union [676629]
- UK Engineering and Physical Sciences Energy Materials Programme [EP/K016288/1]
- EPSRC [EP/K016288/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K016288/1] Funding Source: researchfish
Metal halide perovskite solar cells have rapidly emerged as leading contenders in photovoltaic technology. Compositions with a mixture of cation species on the A-site show the best performance and have higher stability. However, the underlying fundamentals of such an enhancement are not fully understood. Here, we investigate the local structures and dynamics of mixed A-cation compositions. We show that substitution of low concentrations of smaller cations on the A-site in formamidimium lead iodide (CH(NH2)(2)PbI3) results in a global locking of the PbI6 octahedra tilting. In the locked structure the octahedra tilt at a larger angle but undergo a much reduced amplitude of rocking motion. A key impact of this feature is that the rotational or tumbling motion of the CH(NH2)(2)(+) molecular ion in a locked cage is impact of locking on the photovoltaic performance and stability. severely restricted. We discuss the
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