2009•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
Structure vs. property relationships in high mobility fused thiophene polymers
Mingqian He, Jianfeng Li, Michael L. Sorensen, Feixia Zhang, Hon Hang Fong, Vladimir A. Pozdin, Detlef‐M. Smilgies, George G. Malliaras
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Abstract
A family of conjugated polymers with fused structures consisting of three to five thiophene rings and with the same alkyl side chains has been synthesized as a means to understand structure - property relationships. All three polymers showed well extended conjugation through the polymer backbone. X-ray diffraction study of the polymer thin films suggests that the polymer with the even number of fused thiophene rings forms a tight crystalline structure due to its tilted side chain arrangement. On the other hand, the polymers with the odd number of fused thiophene rings packed more loosely. Characterization in a field-effect transistor configuration showed that the mobility of the polymer with the even number of rings is one order of magnitude higher than its oddnumbered counterparts. Through this structure - property study, we demonstrate that proper design of the molecules and properly arranged side chain positions on the polymer backbone can greatly enhance polymer electronic properties