Diao Ying, Zhou Yan, Kurosawa Tadanori, Shaw Leo, Wang Cheng, Park Steve, Guo Yikun, Reinspach Julia A, Gu Kevin, Gu Xiaodan, Tee Benjamin C K, Pang Changhyun, Yan Hongping, Zhao Dahui, Toney Michael F, Mannsfeld Stefan C B, Bao Zhenan
1] Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA [2] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.
Nat Commun. 2015 Aug 12;6:7955. doi: 10.1038/ncomms8955.
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.
溶液涂布太阳能电池材料的形态控制是一个关键挑战，限制了其器件性能和商业可行性。在此，我们提出了一个新概念，以全聚合物本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。我们方法的关键在于基于流动诱导聚合物结晶的假设，使用微结构化印刷刀片设计流体流动。我们的流动设计使供体薄膜结晶度提高了约90%，并减小了微相分离的供体和受体域尺寸。改善后的形态提高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，并显著降低了器件间的差异。由于其简单性和通用性，我们预计我们的设计概念将在全聚合物太阳能电池之外有广泛的应用。
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