Efficient inverted polymer solar cells employing favourable molecular orientation
Efficient inverted polymer solar cells employing favourable molecular orientation
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DOI：
10.1038/nphoton.2015.84
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发表时间：
2015-06-01
期刊：
影响因子：
35
通讯作者：
Murata, Hideyuki
中科院分区：
文献类型：
--
作者：
Vohra, Varun;Kawashima, Kazuaki;Murata, Hideyuki
提高聚合物基体异质结太阳能电池的功率转换效率是一个关键问题。在这里，我们表明，可以获得类似于10%的高效率，使用结晶聚合物PNTz 4 T在单结倒置电池与厚的有源层具有类似于300 nm的厚度。改进的性能可能是由于大量的聚合物微晶与正面的取向和“有利的”分布的边缘上和正面上的微晶沿着的膜厚度（揭示了通过深入研究的共混物膜使用掠入射广角X-射线衍射），这导致在减少电荷复合和有效的电荷传输。这些结果强调了聚合物太阳能电池的巨大前景，并提出了通过材料开发和分子有序控制实现更高效率的希望。
Improving the power conversion efficiency of polymer-based bulk-heterojunction solar cells is a critical issue. Here, we show that high efficiencies of similar to 10% can be obtained using the crystalline polymer PNTz4T in single-junction inverted cells with a thick active layer having a thickness of similar to 300 nm. The improved performance is probably due to the large population of polymer crystallites with a face-on orientation and the 'favourable' distribution of edge-on and face-on crystallites along the film thickness (revealed by in-depth studies of the blend films using grazing-incidence wide-angle X-ray diffraction), which results in a reduction in charge recombination and efficient charge transport. These results underscore the great promise of polymer solar cells and raise the hope of achieving even higher efficiencies by means of materials development and control of molecular ordering.