Compositional engineering of perovskite materials for high-performance solar cells
Compositional engineering of perovskite materials for high-performance solar cells
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DOI：
10.1038/nature14133
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发表时间：
2015-01-22
期刊：
影响因子：
64.8
通讯作者：
Seok, Sang Il
中科院分区：
文献类型：
--
作者：
Jeon, Nam Joong;Noh, Jun Hong;Seok, Sang Il
在旨在生产低成本、高效光伏电池的许多材料和方法中，无机-有机卤化铅钙钛矿材料（1-17）因其高功率转换效率而显得特别有希望用于下一代太阳能器件。到目前为止，钙钛矿太阳能电池的最高效率主要是用甲基铵卤化铅材料获得的（1-10）。在这里，我们将联合收割机-由于其相对窄的带隙-但相对不稳定的碘化甲脒铅（FAPbI（3））与甲基溴化铅铵（MAPbBr（3））结合作为双层太阳能电池结构中的光捕获单元（13）。我们研究了相稳定性，钙钛矿层的形态，电流-电压特性的滞后，以及作为化学组成的函数的整体性能。我们的研究结果表明，将MAPbBr（3）掺入FAPbI（3）中可以稳定FAPbI（3）的钙钛矿相，并在每平方厘米100毫瓦的标准照明下将太阳能电池的功率转换效率提高到18%以上。这些发现进一步强调了无机-有机卤化铅钙钛矿材料用于光伏应用的多功能性和性能潜力。
Of the many materials and methodologies aimed at producing low-cost, efficient photovoltaic cells, inorganic-organic lead halide perovskite materials(1-17) 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 materials(1-10). Here we combine the promising-owing to its comparatively narrow bandgap-but relatively unstable formamidinium lead iodide (FAPbI(3)) with methylammonium lead bromide (MAPbBr(3)) as the light-harvesting unit in a bilayer solar-cell architecture(13). 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 MAPbBr(3) into FAPbI(3) stabilizes the perovskite phase of FAPbI(3) 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.