Design rules for dynamic-template-directed crystallization of conjugated polymers
Design rules for dynamic-template-directed crystallization of conjugated polymers
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DOI：
10.1039/c9me00042a
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发表时间：
2020-01
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影响因子：
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通讯作者：
Erfan Mohammadi;Ge Qu;Prapti Kafle;Seok-Heon Jung;Jin‐Kyun Lee;Ying Diao
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文献类型：
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作者：
Erfan Mohammadi;Ge Qu;Prapti Kafle;Seok-Heon Jung;Jin‐Kyun Lee;Ying Diao
印刷半导体聚合物的多尺度形态和器件性能对溶液涂覆期间的基底/油墨界面性质高度敏感。有一个迫切需要的一般设计规则相关的基板性能和共轭聚合物（CP）的形态，这还不存在。动态表面是特别有前途的模板高度结晶和高度对齐的共轭聚合物薄膜，并已在最近的研究中显示。在这里，我们实现了动态模板法，使用一系列的液体注入的纳米多孔基板作为工具来研究模板的可重构性和化学的共轭聚合物薄膜的多尺度形态的影响，使用高性能的供体-受体聚合物（DPP-BTZ）作为模型化合物。通过量化吸附焓，我们证明了模板-CP相互作用的强度直接测量动态表面在促进共轭聚合物结晶和排列中的有效性。我们进一步表明，相互作用的焓增加，通过提高模板动力学和模板化学敏感调制。具体而言，增加模板-CP相互作用导致更大的域尺寸和更高的结晶度在模板共轭聚合物薄膜制备的胶束引导的溶液涂布。这一观察结果验证了我们的假设，即动态模板的功能，促进共轭聚合物的成核。我们还表明，这种动态模板依赖的形态是独立的涂布速度。值得注意的是，增强的形态特性将场效应晶体管（FET）中的电荷载流子迁移率调制超过一个数量级，达到2.8 cm 2 V-1 s-1的空穴迁移率。这项工作是一个重要的一步，建立一般性的指导方针，如何基板油墨的界面性能的影响形态和性能的解决方案涂布的CP薄膜。
The multiscale morphology and device performance of printed semiconducting polymers are highly sensitive to the substrate/ink interfacial properties during solution coating. There is an urgent need for general design rules correlating the substrate properties and conjugated polymer (CP) morphology, which do not yet exist. Dynamic surfaces are particularly promising for templating highly crystalline and highly aligned conjugated polymer thin films and have been shown in recent studies. Herein, we implement the dynamic-templating method using a series of liquid-infused nanoporous substrates as a tool to study the impact of template reconfigurability and chemistry on the multiscale morphology of conjugated polymer thin films, using a high performing donor–acceptor polymer (DPP-BTz) as a model compound. By quantifying the enthalpy of adsorption, we demonstrate that the strength of template–CP interactions directly measures the effectiveness of dynamic surfaces in promoting conjugated polymer crystallization and alignment. We further show that the enthalpy of interactions increases by enhancing the template dynamics and is sensitively modulated by template chemistry. Specifically, increasing the template–CP interactions leads to a larger domain size and higher degree of crystallinity in templated conjugated polymer thin films prepared by meniscus-guided solution coating. This observation validates our hypothesis that dynamic templates function by promoting the nucleation of conjugated polymers. We also demonstrate that such dynamic-template-dependent morphology is independent of coating speed. Notably, the enhanced morphological properties modulate the charge carrier mobility in field-effect transistors (FETs) over an order of magnitude reaching a hole mobility of 2.8 cm2 V−1 s−1. This work is a significant step towards establishing general guidelines on how the substrate–ink interfacial properties influence morphology and performance of solution coated CP thin films.