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Jacobsson, T. Jesper; Svanström, Sebastian; Andrei, Virgil; Rivett, Jasmine P. H; Kornienko, Nikolay; Philippe, Bertrand; Cappel, Ute B; Rensmo, Håkan; Deschler, Felix; Boschloo, Gerrit
Journal of physical chemistry. C, 06/2018, Letnik: 122, Številka: 25Journal Article
A trend in high performing lead halide perovskite solar cell devices has been increasing compositional complexity by successively introducing more elements, dopants, and additives into the structure; and some of the latest top efficiencies have been achieved with a quadruple cation mixed halide perovskite Cs x FA y MA z Rb1‑x‑y‑z PbBr q I3‑q . This paper continues this trend by exploring doping of mixed lead halide perovskites, FA0.83MA0.17PbBr0.51I2.49, with an extended set of alkali cations, i.e., Cs+, Rb+, K+, and Na+, as well as combinations of them. The doped perovskites were investigated with X-ray diffraction, energy-dispersive X-ray spectroscopy, scanning electron microscopy, hard X-ray photoelectron spectroscopy, UV–vis, steady state fluorescence, and ultrafast transient absorption spectroscopy. Solar cell devices were made as well. Cs+ can replace the organic cations in the perovskite structure, but Rb+, K+, and Na+ do not appear to do that. Despite this, samples doped with K and Na have substantially longer fluorescence lifetimes, which potentially could be beneficial for device performance.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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