Effects of Side-Chain Length and Shape on Polytellurophene Molecular Order and Blend Morphology
Effects of Side-Chain Length and Shape on Polytellurophene Molecular Order and Blend Morphology
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DOI：
10.1021/acs.jpcc.6b11675
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发表时间：
2017-01
影响因子：
3.7
通讯作者：
J. Razzell-Hollis;F. D. Fleischli;Ashlee A. Jahnke;N. Stingelin;D. Seferos;Ji‐Seon Kim
中科院分区：
文献类型：
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作者：
J. Razzell-Hollis;F. D. Fleischli;Ashlee A. Jahnke;N. Stingelin;D. Seferos;Ji‐Seon Kim
我们研究了共轭聚合物聚碲烯的分子序和薄膜形态，以了解碲原子和侧链的选择如何影响有机晶体管中共轭聚合物的主链平面度和性能。我们发现聚（3hexyltellurophene） （P3HTe）延续了从聚噻吩（P3HT）到聚硒苯（P3HS）的趋势：与碲的取代导致更平面的骨干结构，从C = C振动峰向更低波数（~ 1389 cm-1）和更小的光学带隙（~ 1.4 eV）的移动可以看出。共振拉曼光谱显示，分子有序度高度依赖于P3ATe烷基侧链的结构：较长的链引入了动力学阻碍，减少了室温下获得的有序相的比例，而分支侧链引入了位阻，即使在较高温度下沉积，也存在固有的无序性。当与绝缘体HDPE混合时，所有三种聚合物都表现出…
We investigate the molecular order and thin film morphology of the conjugated polymer polytellurophene, in order to understand how the tellurium atom and the choice of side-chain influence the conjugated polymer’s backbone planarity and performance in organic transistors. We find that poly(3hexyltellurophene) (P3HTe) continues the trend from polythiophene (P3HT) to polyselenophene (P3HS): substitution with Tellurium leads to a more planar backbone, evident from the shifts of the C═C vibrational peak to lower wavenumbers (∼1389 cm–1) and a smaller optical band gap (∼1.4 eV). Resonant Raman spectroscopy revealed that molecular order was highly dependent on the structure of the P3ATe alkyl side-chain: a longer chains introduces kinetic hindrance, reducing the fraction of ordered phase obtained at room temperature, while a branched side-chain introduces steric hindrance, with intrinsic disorder present even when deposited at higher temperatures. When blended with the insulator HDPE, all three polymers exhibit...