Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.167
Publication date: 21st February 2018
Tailored monovalent cation substitution in mixed-cation hybrid perovskites enables solar cell efficiencies beyond 20% and enhanced stability. Here, we use transient absorption and photoluminescence spectroscopy to study the effect of cation substitution on the carrier recombination dynamics in Rbx(Csy(MAzFA1-z)1-y)1-xPb(I0.83Br0.17)3 (MA=methylammonium, FA=formamidinium) hybrid perovskite thin-films. We perform a detailed analysis of the recombination dynamics, from which we separate radiative and non-radiative recombination pathways. We find that careful tuning of the cation composition leads to a reduction in trap-assisted non-radiative recombination channels, which supports enhanced lifetimes and high luminescence yields. Unexpectedly, we further observe the reduction of a non-radiative bimolecular recombination channel, particularly upon inclusion of formamidinium. Using Raman and X-ray diffraction techniques, we study the effect of cation substitution on lattice order. We find that formamidinium inclusion, aided through the presence of Rb and Cs during fabrication, leads to a reduction of the tetragonal distortion, and an increased rigidity of the lattice. We attribute the enhanced luminescence yields to reduced defect formation through carrier trapping due to the reduced lattice disorder.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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