Efficient Polymer Solar Cells Based on Non-fullerene Acceptors with Potential Device Lifetime Approaching 10 Years
Efficient Polymer Solar Cells Based on Non-fullerene Acceptors with Potential Device Lifetime Approaching 10 Years
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DOI：
10.1016/j.joule.2018.09.001
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发表时间：
2019-01-16
期刊：
影响因子：
39.8
通讯作者：
Brabec, Christoph J.
中科院分区：
文献类型：
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作者：
Du, Xiaoyan;Heumueller, Thomas;Brabec, Christoph J.
基于非富勒烯受体的有机太阳能电池近年来发展非常迅速。功率转换效率(PCE)、稳定性和生产成本之间的适当平衡需要进一步阐述。在这里，我们研究了基于几种有代表性的非饱和脂肪酸的高效有机半导体的工业可行性。最稳定的OSC显示出类似于8%的PCE，以及在相当于1个太阳照度下T-80的外推寿命(初始PCE的80%)超过11,000小时，这将导致非常令人印象深刻的工作寿命接近10年。光稳定性强烈依赖于非饱和脂肪酸的端基和侧链工程。光老化过程中共轭的断裂会导致能量陷阱的增加。端基的氟化稳定了分子的耐光浸泡，而添加甲基则表现出相反的趋势。侧链修饰会显著影响聚合物的形态稳定性。降低这类非饱和脂肪酸的合成复杂性最终将推动有机光伏技术进入实际应用。
Organic solar cells (OSCs) based on non-fullerene acceptors (NFAs) have developed very fast in recent years. A proper balance among power conversion efficiency (PCE), stability, and production cost needs further elaboration. Here we investigate the industrial viability of highly efficient OSCs based on several representative NFAs. The most stable OSCs exhibit PCE of similar to 8% along with extrapolated T-80 lifetime (80% of the initial PCE) of over 11,000 hr under equivalent 1 sun illumination, which would lead to a very impressive operational lifetime approaching 10 years. Photo-stability is strongly dependent on the end-group and side-chain engineering of the NFAs. Breaking of conjugation during photo-aging leads to increased energetic traps. Fluorination of the end-group stabilizes molecules against light soaking, while adding methyl groups shows an opposite trend. Side-chain modification can significantly influence the morphological stability. Reducing synthetic complexity of this class of NFAs will ultimately push the organic photovoltaics technology into real-life applications.