Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Extending the Compositional Space of Mixed Lead Halide Perovskites by Cs, Rb, K, and Na Doping

Extending the Compositional Space of Mixed Lead Halide Perovskites by Cs, Rb, K, and Na Doping
Sebastian Svanström, Bertrand Philippe, Jasmine P. H. Rivett, Virgil Andrei, Håkan Rensmo, Nikolay Kornienko, T. Jesper Jacobsson, Felix Deschler, Ute B. Cappel, Gerrit Boschloo
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 CsxFAyMAzRb1-x-y-zPbBrqI3-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.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b12464

DOI: 10.1021/acs.jpcc.7b12464

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