Multicomponent semiconducting polymer systems with low crystallization-induced percolation threshold

材料科学 结晶度 聚合物 结晶 无定形固体 半导体 渗透(认知心理学) 相(物质) 聚合物结晶 纳米技术 化学工程 光电子学 复合材料 有机化学 化学 神经科学 工程类 生物
作者
Shalom Goffri,Christian Müller,Natalie Stingelin,Dag W. Breiby,Christopher P. Radano,Jens Wenzel Andreasen,Richard L. Thompson,René A. J. Janssen,M. Nielsen,Paul Smith,Henning Sirringhaus
出处
期刊:Nature Materials [Nature Portfolio]
卷期号:5 (12): 950-956 被引量:312
标识
DOI:10.1038/nmat1779
摘要

Blends and other multicomponent systems are used in various polymer applications to meet multiple requirements that cannot be fulfilled by a single material. In polymer optoelectronic devices it is often desirable to combine the semiconducting properties of the conjugated species with the excellent mechanical properties of certain commodity polymers. Here we investigate bicomponent blends comprising semicrystalline regioregular poly(3-hexylthiophene) and selected semicrystalline commodity polymers, and show that, owing to a highly favourable, crystallization-induced phase segregation of the two components, during which the semiconductor is predominantly expelled to the surfaces of cast films, we can obtain vertically stratified structures in a one-step process. Incorporating these as active layers in polymer field-effect transistors, we find that the concentration of the semiconductor can be reduced to values as low as 3 wt% without any degradation in device performance. This is in stark contrast to blends containing an amorphous insulating polymer, for which significant reduction in electrical performance was reported. Crystalline-crystalline/semiconducting-insulating multicomponent systems offer expanded flexibility for realizing high-performance semiconducting architectures at drastically reduced materials cost with improved mechanical properties and environmental stability, without the need to design all performance requirements into the active semiconducting polymer itself.
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