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• W2979897997 abstract "Abstract In this work, the influence of a partial introduction of bromide ( x = 0–0.33) into MA 0.75 FA 0.15 PEA 0.1 Sn(Br x I 1− x ) 3 (MA: methylammonium, FA: formamidinium, PEA: phenylethylammonium) triple cation tin perovskite on the material properties and photovoltaic performance is investigated and characterized. The introduction of bromide shifts the optical band gap of the perovskite films from 1.29 eV for the iodide-based perovskite to 1.50 eV for the perovskite with a bromide content of x = 0.33. X-ray diffraction measurements reveal that the size of the unit cell is also gradually reduced based on the incorporation of bromide. Regarding the photovoltaic performance of the perovskite films, it is shown that already small amounts of bromide ( x = 0.08) in the perovskite system increase the open circuit voltage, short circuit current density and fill factor. The maximum power conversion efficiency of 4.63% was obtained with a bromide content of x = 0.25, which can be ascribed to the formation of homogeneous thin films in combination with higher values of the open circuit voltage. Upon introduction of a higher amount of bromide ( x = 0.33), the perovskite absorber layers form pinholes, thus reducing the overall device performance. Graphic abstract" @default.
• W2979897997 created "2019-10-18" @default.
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• W2979897997 date "2019-10-11" @default.
• W2979897997 modified "2023-10-14" @default.
• W2979897997 title "Dependence of material properties and photovoltaic performance of triple cation tin perovskites on the iodide to bromide ratio" @default.
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• W2979897997 doi "https://doi.org/10.1007/s00706-019-02503-6" @default.
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