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Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic¨Corganic lead halide perovskite materials1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 appear particularly promising for next-generation solar devices owing to their high power conversion efficiency. The highest efficiencies reported for perovskite solar cells so far have been obtained mainly with methylammonium lead halide materials1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Here we combine the promising¡ªowing to its comparatively narrow bandgap¡ªbut relatively unstable formamidinium lead iodide (FAPbI3) with methylammonium lead bromide (MAPbBr3) as the light-harvesting unit in a bilayer solar-cell architecture13. We investigated phase stability, morphology of the perovskite layer, hysteresis in current¨Cvoltage characteristics, and overall performance as a function of chemical composition. Our results show that incorporation of MAPbBr3 into FAPbI3 stabilizes the perovskite phase of FAPbI3 and improves the power conversion efficiency of the solar cell to more than 18 per cent under a standard illumination of 100 milliwatts per square centimetre. These findings further emphasize the versatility and performance potential of inorganic¨Corganic lead halide perovskite materials for photovoltaic applications.Nature¶Ô¸ÆîÑ¿óÌ«ÑôÄÜµç³ØµÄ×îб¨µÀ£ºÍ¨¹ý×é·ÖÉè¼ÆÀ´ÖƱ¸¸ßЧ¸ÆîÑ¿óÌ«ÑôÄÜµç³Ø
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