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• W2892851785 abstract "Perovskite solar cells (PSCs) have drawn wide attention due to the rapidly rising efficiency which presently attains over 23%. However, problems of instability continue to plague the high-efficiency devices impairing their practical applications. Here, by firstly introducing smaller-size NH4+ into (FAPbI3)0.85(MAPbBr3)0.15 (FA/MA) to form a novel 2D- 3D mixed structure, we designed and prepared new-type hybrid perovskite materials of [(NH4)2.4(FA)n−1PbnI3n+1.4]0.85 (MAPbBr3)0.15 (n=3, 5, 7, 9 and 11) (A/FA/MA) and used them as absorber in solar cells. Especially, unlike the reported 2D/MD perovskite perovskites based on larger-size ammonium salts; A/FA/MA perovskites are the first to display red-shift light absorption and decreased band gaps in comparison to normal perovskites. Consequently, when n=9, the A/FA/MA device shows outstanding performance with a solar to electric power conversion efficiency (PCE) of 18.25% and negligible hysteresis. When the encapsulated A/FA/MA perovskite device was soaked in full sunlight for 1,000 h, the PCE remains almost unchanged. Moreover, the unsealed A/FA/MA PSCs maintain 90% of their initial PCE when aged at high humidity conditions over the same 1000-h time period. Our findings provide a guide for the future development of such novel perovskites and it is helpful to select more suitable ammonium salt to obtain highly efficient and stable 2D-3D PSCs." @default.
• W2892851785 created "2018-10-05" @default.
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• W2892851785 date "2018-09-21" @default.
• W2892851785 modified "2023-10-14" @default.
• W2892851785 title "New-type highly stable 2D/3D perovskite materials: the effect of introducing ammonium cation on performance of perovskite solar cells" @default.
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• W2892851785 doi "https://doi.org/10.1007/s40843-018-9343-1" @default.
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