Large guanidinium cation mixed with methylammonium in lead iodide perovskites for 19% efficient solar cells

Alexander D. Jodlowski, Cristina Roldán-Carmona (), Giulia Grancini, Manuel Salado, Maryline Ralaiarisoa, Shahzada Ahmad, Norbert Koch, Luis Camacho, Gustavo de Miguel () and Mohammad Khaja Nazeeruddin ()
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Alexander D. Jodlowski: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Cristina Roldán-Carmona: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Giulia Grancini: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Manuel Salado: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Maryline Ralaiarisoa: Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof
Shahzada Ahmad: Abengoa Research, Abengoa, C/ Energía Solar no. 1
Norbert Koch: Humboldt-Universität zu Berlin, Institut für Physik & IRIS Adlershof
Luis Camacho: Instituto Universitario de Investigación en Química Fina y Nanoquímica IUQFN, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie
Gustavo de Miguel: Instituto Universitario de Investigación en Química Fina y Nanoquímica IUQFN, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie
Mohammad Khaja Nazeeruddin: Ecole Polytechnique Fédérale de Lausanne (EPFL)

Nature Energy, 2017, vol. 2, issue 12, 972-979

Abstract: Abstract Organic–inorganic lead halide perovskites have shown photovoltaic performances above 20% in a range of solar cell architectures while offering simple and low-cost processability. Despite the multiple ionic compositions that have been reported so far, the presence of organic constituents is an essential element in all of the high-efficiency formulations, with the methylammonium and formamidinium cations being the sole efficient options available to date. In this study, we demonstrate improved material stability after the incorporation of a large organic cation, guanidinium, into the MAPbI3 crystal structure, which delivers average power conversion efficiencies over 19%, and stabilized performance for 1,000 h under continuous light illumination, a fundamental step within the perovskite field.

Date: 2017
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DOI: 10.1038/s41560-017-0054-3

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