Detection and role of trace impurities in high-performance organic solar cells
Detection and role of trace impurities in high-performance organic solar cells
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DOI：
10.1039/c3ee40556g
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发表时间：
2013-05-01
影响因子：
32.5
通讯作者：
Darling, Seth B.
中科院分区：
文献类型：
--
作者：
Nikiforov, Maxim P.;Lai, Barry;Darling, Seth B.
有机太阳能电池中的微量杂质，如共轭聚合物中残留的催化剂材料，往往被忽视，但已知会对器件性能产生有害影响。这些杂质的性质和数量的批次之间的变化导致了光电功能不可复制的广泛问题，但迄今为止还没有出现能够可靠地识别有机光伏活性层混合物中杂质的特征或其浓度的技术。在这里，我们专注于最先进的高性能体异质结共混物，并表明基于同步加速器的x射线荧光可以检测和量化这些系统中痕量金属杂质的浓度。采用人工向聚合物/富勒烯共混物中引入已知数量的额外催化剂的策略，我们确定了性能下降的阈值浓度和降解机制。有了目标杂质浓度的知识和精确测量其存在的技术，研究人员可以实施材料制备过程，以实现有机太阳能电池的一致，高性能。
Trace impurities in organic solar cells, such as those from residual catalyst material in conjugated polymers, are often ignored but are known to deleteriously affect device performance. Batch-to-batch variations in the nature and quantity of such impurities leads to widespread issues with irreproducible optoelectronic function, yet to date no technique has emerged that is reliably capable of identifying the character of impurities or their concentration in organic photovoltaic active layer blends. Here we focus on state-of-the-art, high-performance bulk heterojunction blends and show that synchrotron-based X-ray fluorescence can detect and quantify trace concentrations of metal impurities in these systems. Adopting a strategy of artificially introducing known quantities of additional catalyst into polymer/fullerene blends, we identify both the threshold concentration at which performance degrades and the mechanism for the degradation. With the knowledge of a target impurity concentration and a technique in hand to accurately measure their presence, researchers can implement materials preparation processes to achieve consistent, high performance in organic solar cells.