High-Field-Effect Mobility of Low-Crystallinity Conjugated Polymers with Localized Aggregates

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• 作者：Sung Y. Son ; Yebyeol Kim ; Junwoo Lee ; Gang-Young Lee ; Won-Tae Park ; Yong-Young Noh ; Chan E. Park ; Taiho Park
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：138
• 期：26
• 页码：8096-8103
• 全文大小：686K
• 年卷期：0
• ISSN：1520-5126

文摘

Charge carriers typically move faster in crystalline regions than in amorphous regions in conjugated polymers because polymer chains adopt a regular arrangement resulting in a high degree of π–π stacking in crystalline regions. In contrast, the random polymer chain orientation in amorphous regions hinders connectivity between conjugated backbones; thus, it hinders charge carrier delocalization. Various studies have attempted to enhance charge carrier transport by increasing crystallinity. However, these approaches are inevitably limited by the semicrystalline nature of conjugated polymers. Moreover, high-crystallinity conjugated polymers have proven inadequate for soft electronics applications because of their poor mechanical resilience. Increasing the polymer chain connectivity by forming localized aggregates via π-orbital overlap among several conjugated backbones in amorphous regions provides a more effective approach to efficient charge carrier transport. A simple strategy relying on the density of random copolymer alkyl side chains was developed to generate these localized aggregates. In this strategy, steric hindrance caused by these side chains was modulated to change their density. Interestingly, a random polymer exhibiting low alkyl side chain density and crystallinity displayed greatly enhanced field-effect mobility (1.37 cm²/(V·s)) compared with highly crystalline poly(3-hexylthiophene).