Wang Gang, Feng Liang-Wen, Huang Wei, Mukherjee Subhrangsu, Chen Yao, Shen Dengke, Wang Binghao, Strzalka Joseph, Zheng Ding, Melkonyan Ferdinand S, Yan Jinhui, Stoddart J Fraser, Fabiano Simone, DeLongchamp Dean M, Zhu Meifang, Facchetti Antonio, Marks Tobin J
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, International Joint Laboratory for Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
Department of Chemistry, Center for Light Energy Activated Redox Processes, Northwestern University, Evanston, IL 60208.
Proc Natl Acad Sci U S A. 2020 Jul 28;117(30):17551-17557. doi: 10.1073/pnas.2000398117. Epub 2020 Jul 9.
The rational creation of two-component conjugated polymer systems with high levels of phase purity in each component is challenging but crucial for realizing printed soft-matter electronics. Here, we report a mixed-flow microfluidic printing (MFMP) approach for two-component -polymer systems that significantly elevates phase purity in bulk-heterojunction solar cells and thin-film transistors. MFMP integrates laminar and extensional flows using a specially microstructured shear blade, designed with fluid flow simulation tools to tune the flow patterns and induce shear, stretch, and pushout effects. This optimizes polymer conformation and semiconducting blend order as assessed by atomic force microscopy (AFM), transmission electron microscopy (TEM), grazing incidence wide-angle X-ray scattering (GIWAXS), resonant soft X-ray scattering (R-SoXS), photovoltaic response, and field effect mobility. For printed all-polymer (poly[(5,6-difluoro-2-octyl-2H-benzotriazole-4,7-diyl)-2,5-thiophenediyl[4,8-bis[5-(2-hexyldecyl)-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-2,5-thiophenediyl]) [J51]:(poly{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)}) [N2200]) solar cells, this approach enhances short-circuit currents and fill factors, with power conversion efficiency increasing from 5.20% for conventional blade coating to 7.80% for MFMP. Moreover, the performance of mixed polymer ambipolar [poly(3-hexylthiophene-2,5-diyl) (P3HT):N2200] and semiconducting:insulating polymer unipolar (N2200:polystyrene) transistors is similarly enhanced, underscoring versatility for two-component -polymer systems. Mixed-flow designs offer modalities for achieving high-performance organic optoelectronics via innovative printing methodologies.
在每个组件中创建具有高相纯度的双组分共轭聚合物系统具有挑战性，但对于实现印刷软物质电子学至关重要。在此，我们报告了一种用于双组分聚合物系统的混合流微流体印刷（MFMP）方法，该方法显著提高了体异质结太阳能电池和薄膜晶体管中的相纯度。MFMP使用专门的微结构化剪切刀片整合层流和拉伸流，该刀片通过流体流动模拟工具设计，以调整流动模式并产生剪切、拉伸和推出效果。通过原子力显微镜（AFM）、透射电子显微镜（TEM）、掠入射广角X射线散射（GIWAXS）、共振软X射线散射（R-SoXS）、光伏响应和场效应迁移率评估，这优化了聚合物构象和半导体共混物的有序性。对于印刷全聚合物（聚[(5,6-二氟-2-辛基-2H-苯并三唑-4,7-二基)-2,5-噻吩二基[4,8-双[5-(2-己基癸基)-2-噻吩基]苯并[1,2-b:4,5-b']二噻吩-2,6-二基]-2,5-噻吩二基]) [J51]:(聚{[N,N'-双(2-辛基十二烷基)萘-1,4,5,8-双(二甲酰亚胺)-2,6-二基]-alt-5,5'-(2,2'-联噻吩)}) [N2200])太阳能电池，这种方法提高了短路电流和填充因子，功率转换效率从传统刮刀涂布的5.20%提高到MFMP的7.80%。此外，混合聚合物双极性[聚(3-己基噻吩-2,5-二基)（P3HT）:N2200]和半导体:绝缘聚合物单极性（N2200:聚苯乙烯）晶体管的性能也同样得到增强，突出了双组分聚合物系统的通用性。混合流设计为通过创新印刷方法实现高性能有机光电器件提供了模式。
