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

Jodlowski, AD; Roldan-Carmona, C; Grancini, G; Salado, M; Ralaiarisoa, M; Ahmad, S; Koch, N; Camacho, L; de Miguel, G; Nazeeruddin, MK

NATURE ENERGY
2017
VL / 2 - BP / 972 - EP / 979
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 MAPbI(3) 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.

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PROYECTO FINANCIADO POR PLAN NACIONAL DE INVESTIGACIÓN AGENCIA ESTATAL DE INVESTIGACIÓN, MINISTERIO DE CIENCIA E INNOVACIÓN. PID2019-109127RB-I00