Flow-enhanced solution printing of all-polymer solar cells.
Flow-enhanced solution printing of all-polymer solar cells.
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DOI：
10.1038/ncomms8955
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发表时间：
2015-08-12
影响因子：
16.6
通讯作者：
Bao Z
中科院分区：
文献类型：
--
作者：
Diao Y;Zhou Y;Kurosawa T;Shaw L;Wang C;Park S;Guo Y;Reinspach JA;Gu K;Gu X;Tee BC;Pang C;Yan H;Zhao D;Toney MF;Mannsfeld SC;Bao Z
溶液涂层太阳能电池材料的形态控制是限制其器件性能和商业可行性的关键挑战。本文提出了一种以全聚合物体异质结太阳能电池为模型系统，在溶液印刷过程中控制相分离的新概念。该方法的关键在于基于流动诱导聚合物结晶的假设，利用微结构打印叶片设计流体流动。我们的流动设计导致供体薄膜结晶度增加~ 90%，并减少了微相分离的供体和受体结构域尺寸。改进的形态增强了各种印刷条件下太阳能电池器件性能的所有指标，特别是导致更高的短路电流，填充因子，开路电压，并显着降低了器件之间的变化。我们希望我们的设计理念能在全聚合物太阳能电池之外有广泛的应用，因为它的简单性和多功能性。溶液印刷是制造有机太阳能电池的理想途径，但主要的挑战在于形态控制。在这里，Diao等人在打印过程中使用微结构叶片来引导溶液流动，从而改善了聚合物结晶和由此产生的设备性能。
Morphology control of solution coated solar cell materials presents a key challenge limiting their device performance and commercial viability. Here we present a new concept for controlling phase separation during solution printing using an all-polymer bulk heterojunction solar cell as a model system. The key aspect of our method lies in the design of fluid flow using a microstructured printing blade, on the basis of the hypothesis of flow-induced polymer crystallization. Our flow design resulted in a ∼90% increase in the donor thin film crystallinity and reduced microphase separated donor and acceptor domain sizes. The improved morphology enhanced all metrics of solar cell device performance across various printing conditions, specifically leading to higher short-circuit current, fill factor, open circuit voltage and significantly reduced device-to-device variation. We expect our design concept to have broad applications beyond all-polymer solar cells because of its simplicity and versatility. Solution printing is a desirable route for manufacturing organic solar cells, whilst the major challenge lies with morphology control. Here, Diao et al. use a microstructured blade to guide the solution flow during printing, which improves polymer crystallization and the resulting device performance.