Vertical Distribution to Optimize Active Layer Morphology for Efficient All-Polymer Solar Cells by J71 as a Compatibilizer,Macromolecules

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Vertical Distribution to Optimize Active Layer Morphology for Efficient All-Polymer Solar Cells by J71 as a Compatibilizer
Macromolecules ( IF 5.1 ) Pub Date : 2019-05-31 00:00:00 , DOI: 10.1021/acs.macromol.9b00411
Siqi Liu , Dong Chen , Weihua Zhou , Zoukangning Yu , Lie Chen , Feng Liu ₁ , Yiwang Chen

Affiliation

From the miscibility viewpoint, the mechanism of how the third polymer influences the morphology evolution of an active layer composed of a polymer donor and a polymer acceptor remains to be unknown. In this article, J71 was incorporated into the PBDB-T:PNDI-2T-TR(5) system to afford a ternary all-polymer solar cell showing the maximal power conversion efficiency of 9.12%. It is observed that J71 could provide complementary absorption in addition to the formation of cascade energy-level alignment with other polymers, demonstrating a Förster resonance energy transfer from J71 to PBDB-T. By the combination of dynamic mechanical analysis and differential scanning calorimetry techniques, the miscibility in the J71:PNDI-2T-TR(5) blend is better than that in the PBDB-T:PNDI-2T-TR(5) blend according to Fox equation analysis, showing Flory–Huggins interaction parameters of −1.003 and 0.006, respectively. J71 could serve as a compatibilizer to optimize the morphology of the active layer, leading to enrichment of PNDI-2T-TR(5) on the film surface due to the much lower surface energy of PNDI-2T-TR(5). The optimized vertical distribution of PNDI-2T-TR(5) with enhanced crystallization could be further demonstrated by grazing incidence wide-angle X-ray scattering and atomic force microscopy, facilitating electron transfer and collection in the normal device structure for improved photovoltaic performance.

中文翻译：

垂直分布以通过J71作为相容剂优化高效全聚合物太阳能电池的有源层形态

从可混溶性的观点来看，第三聚合物如何影响由聚合物供体和聚合物受体组成的活性层的形态演变的机理尚不清楚。在本文中，将J71集成到PBDB-T：PNDI-2T-TR（5）系统中，以提供显示最大功率转换效率为9.12％的三元全聚合物太阳能电池。可以观察到，J71除与其他聚合物形成级联能级排列外，还可以提供互补吸收，这表明从J71到PBDB-T的Förster共振能量转移。根据福克斯的说法，通过动态力学分析和差示扫描量热技术的结合，J71：PNDI-2T-TR（5）混合物的混溶性优于PBDB-T：PNDI-2T-TR（5）混合物的混溶性方程分析分别显示Flory-Huggins相互作用参数为-1.003和0.006。J71可以用作增容剂，以优化活性层的形貌，由于PNDI-2T-TR（5）的表面能低得多，因此导致PNDI-2T-TR（5）在膜表面富集。PNDI-2T-TR（5）具有增强的结晶性的优化垂直分布可以通过掠入射入射广角X射线散射和原子力显微镜进一步证明，从而促进了常规器件结构中的电子转移和收集，从而改善了光伏性能。

更新日期：2019-05-31

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