The fate of electron-hole pairs in polymer:fullerene blends for organic photovoltaics.
The fate of electron-hole pairs in polymer:fullerene blends for organic photovoltaics.
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DOI：
10.1038/ncomms12556
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发表时间：
2016-09-02
影响因子：
16.6
通讯作者：
Banerji, Natalie
中科院分区：
文献类型：
--
作者：
Causa, Martina;De Jonghe-Risse, Jelissa;Scarongella, Mariateresa;Brauer, Jan C.;Buchaca-Domingo, Ester;Moser, Jacques-E.;Stingelin, Natalie;Banerji, Natalie
关于在有机太阳能电池中使用的供体：受体共混物中如何产生自由电荷存在长期的争论，并且其通常由复杂的相形态组成，其中供体和受体材料的混合相和纯相共存。在这里，我们解决这个问题，根据我们的结论在外部施加电场的存在和不存在下获得的斯塔克效应光谱数据。排除在文献中发现的相反的观点，我们毫不含糊地表明，光生电子空穴对的命运-无论他们将游离到自由电荷或双生复合-是在超快的时间确定，尽管事实上，他们的实际空间分离可以慢得多。我们的见解对于进一步开发有机太阳能电池的材料设计和加工的合理方法非常重要，有助于实现其作为无铅第三代能源技术的承诺，其效率可达到10%以上。 电荷的产生和传输对有机太阳能电池的性能至关重要，但其机制仍然存在争议。Causa等人表明，聚合物：富勒烯共混物的相形态决定了激子在飞秒下的解离，尽管空间分离可以在皮秒下发生。
There has been long-standing debate on how free charges are generated in donor:acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor material co-exist. Here we resolve this question, basing our conclusions on Stark effect spectroscopy data obtained in the absence and presence of externally applied electric fields. Reconciling opposing views found in literature, we unambiguously demonstrate that the fate of photogenerated electron–hole pairs—whether they will dissociate to free charges or geminately recombine—is determined at ultrafast times, despite the fact that their actual spatial separation can be much slower. Our insights are important to further develop rational approaches towards material design and processing of organic solar cells, assisting to realize their purported promise as lead-free, third-generation energy technology that can reach efficiencies over 10%. Charge generation and transport are crucial to the performance of organic solar cells, but the mechanism remains controversial. Causa' et al. show that the phase morphology of polymer:fullerene blends determines the exciton dissociation at femtoseconds, although the spatial separation can occur at picoseconds.
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