Flow-enhanced solution printing of all-polymer solar cells

Ying Diao, Yan Zhou, Tadanori Kurosawa, Leo Shaw, Cheng Wang, Steve Park, Yikun Guo, Julia A. Reinspach, Kevin Gu, Xiaodan Gu, Benjamin C. K. Tee, Changhyun Pang, Hongping Yan, Dahui Zhao, Michael F. Toney, Stefan C. B. Mannsfeld and Zhenan Bao ()
Additional contact information
Ying Diao: Stanford University
Yan Zhou: Stanford University
Tadanori Kurosawa: Stanford University
Leo Shaw: Stanford University
Cheng Wang: Advanced Light Source, Lawrence Berkeley National Laboratory
Steve Park: Stanford University
Yikun Guo: College of Chemistry, Peking University
Julia A. Reinspach: Stanford University
Kevin Gu: Stanford University
Xiaodan Gu: Stanford University
Benjamin C. K. Tee: Stanford University
Changhyun Pang: Stanford University
Hongping Yan: Stanford University
Dahui Zhao: College of Chemistry, Peking University
Michael F. Toney: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
Stefan C. B. Mannsfeld: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
Zhenan Bao: Stanford University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms8955

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