Surpassing 10% Efficiency Benchmark for Nonfullerene Organic Solar Cells by Scalable Coating in Air from Single Nonhalogenated Solvent
Surpassing 10% Efficiency Benchmark for Nonfullerene Organic Solar Cells by Scalable Coating in Air from Single Nonhalogenated Solvent
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DOI：
10.1002/adma.201705485
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发表时间：
2018-02
影响因子：
29.4
通讯作者：
L. Ye;Yuan Xiong;Qianqian Zhang;Sunsun Li;Cheng Wang;Zhang Jiang;Jianhui Hou;W. You;H. Ade-H.-Ad
中科院分区：
文献类型：
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作者：
L. Ye;Yuan Xiong;Qianqian Zhang;Sunsun Li;Cheng Wang;Zhang Jiang;Jianhui Hou;W. You;H. Ade-H.-Ad
非富勒烯有机太阳能电池（OSC）的商业化关键取决于在典型操作条件（例如温度和湿度）下的响应和放大能力。尽管在保护性气氛中制造的旋涂器件的功率转换效率（PCE）迅速提高，但通过刮刀涂覆印刷的非富勒烯OSC器件的效率仍低于6%。这种缓慢的进展大大限制了高性能非富勒烯OSC的实际打印。在这里，通过将非氟化受体IT-M与聚合物供体FTAZ配对，引入了一种新的且相对稳定的非富勒烯组合。使用单一无卤素溶剂，旋涂FTAZ：IT-M器件可实现超过12%的效率。更重要的是，在空气中无氯的FTAZ：IT-M刮刀涂层能够产生接近11%的PCE，尽管湿度为50%。X射线散射结果表明，大的π-π相干长度、相对于衬底的高程度的面向取向以及小于20 nm的小畴间距与如此高的器件性能密切相关。该材料系统和方法通过近似可扩展制造方法的涂层技术产生了非富勒烯OSC器件的最高报告性能，并通过高通量生产为低成本，低毒性和高效率的OSC的开发带来了巨大的希望。
The commercialization of nonfullerene organic solar cells (OSCs) critically relies on the response under typical operating conditions (for instance, temperature and humidity) and the ability of scale‐up. Despite the rapid increase in power conversion efficiency (PCE) of spin‐coated devices fabricated in a protective atmosphere, the efficiencies of printed nonfullerene OSC devices by blade coating are still lower than 6%. This slow progress significantly limits the practical printing of high‐performance nonfullerene OSCs. Here, a new and relatively stable nonfullerene combination is introduced by pairing the nonfluorinated acceptor IT‐M with the polymeric donor FTAZ. Over 12% efficiency can be achieved in spin‐coated FTAZ:IT‐M devices using a single halogen‐free solvent. More importantly, chlorine‐free, blade coating of FTAZ:IT‐M in air is able to yield a PCE of nearly 11% despite a humidity of ≈50%. X‐ray scattering results reveal that large π–π coherence length, high degree of face‐on orientation with respect to the substrate, and small domain spacing of ≈20 nm are closely correlated with such high device performance. The material system and approach yield the highest reported performance for nonfullerene OSC devices by a coating technique approximating scalable fabrication methods and hold great promise for the development of low‐cost, low‐toxicity, and high‐efficiency OSCs by high‐throughput production.