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Nature对钙钛矿太阳能电池的最新报道：通过组分设计来制备高效钙钛矿太阳能电池
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要问如今哪个材料最热，答案毫无疑问就是钙钛矿材料。瑞士洛桑联邦理工的Michael Graetzel教授和英国牛津大学的Henry J. Snaith教授是这个材料研究领域的领军人物。在短短两年多的时间中，钙钛矿电池的效率从9.7%迅速攀升到19.3%。这篇文章在效率上虽然没有得到较大的突破，但是提供了一种提升其效率的新方法——把MAPbBr3注入到FAPbI3中来稳定其晶相。 Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic–organic 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—owing to its comparatively narrow bandgap—but 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–voltage 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–organic lead halide perovskite materials for photovoltaic applications.  1.jpg  2.jpg |
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2015-01-08 21:00:14, 636.72 K
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