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Effect of Alcohol Polarity on the Aggregation and Film-Forming Behaviors of Poly(3-hexylthiophene)
ACS Applied Polymer Materials ( IF 5 ) Pub Date : 2020-06-18 , DOI: 10.1021/acsapm.0c00448
Eun Hye Kwon 1 , Gun Woo Kim 1 , Min Kim 2 , Yeong Don Park 1
Affiliation  

Solvent-additive engineering has been demonstrated to be an effective strategy for preparing highly crystalline organic semiconductors. Here, we investigate how the physicochemical properties of a solvent additive influence not only the aggregation of a polymer but also its film-forming behavior. We chose alcohol-based polar solvents as poor solvent additives that induce polymer aggregation when added to a polymer solution. We subsequently demonstrated that the polarity of the solvent additive strongly affects its miscibility with the main solvent and the ability of the resultant mixed solvent to dissolve the conjugated polymer poly(3-hexylthiophene) (P3HT); this solvation ability was related to the intermolecular force of the dipole–dipole interaction. On the contrary, we found that during polymer film formation by spin-coating, the evaporation sequence and solvent composition play more influential roles than dipole–dipole interactions in determining the crystallinity of the resultant polymer film. On the basis of the understanding of polymer aggregation gained in this work, we attained a highly crystalline P3HT film with enhanced field-effect mobility. The approach presented in this study provides a range of opportunities for the solution processing of organic electronics for various applications.

中文翻译:

酒精极性对聚(3-己基噻吩)聚集和成膜行为的影响

溶剂添加剂工程已被证明是制备高结晶性有机半导体的有效策略。在这里,我们研究溶剂添加剂的物理化学特性如何不仅影响聚合物的聚集,而且影响其成膜行为。我们选择基于醇的极性溶剂作为不良的溶剂添加剂,当添加到聚合物溶液中时会导致聚合物聚集。随后,我们证明了溶剂添加剂的极性极大地影响了其与主溶剂的混溶性以及所得混合溶剂溶解共轭聚合物聚(3-己基噻吩)(P3HT)的能力;这种溶剂化能力与偶极-偶极相互作用的分子间力有关。相反,我们发现在通过旋涂形成聚合物膜的过程中,在确定所得聚合物膜的结晶度时,蒸发顺序和溶剂组成比偶极-偶极相互作用更具影响力。在对这项工作中获得的聚合物聚集的理解的基础上,我们获得了具有增强的场效应迁移率的高度结晶的P3HT膜。本研究中提出的方法为各种应用的有机电子产品的溶液处理提供了一系列机会。
更新日期:2020-07-10
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