Alkylsubstituted Thienothiophene Semiconducting Materials: Structure-Property Relationships

作者：He Mingqian^*; Li Jianfeng; Sorensen Michael L; Zhang Feixia; Hancock Robert R; Fong Hon Hang; Pozdin Vladimir A; Smilgies Detlef M; Malliaras George G

来源：Journal of the American Chemical Society, 2009, 131(33): 11930-11938.

DOI：10.1021/ja903895s

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. Ionization potentials (IP) ranged from 5.15 to 5.21 eV; these large values are indicative of their excellent oxidative stability. X-ray diffraction and AFM studies suggest 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 1 order of magnitude higher than its odd-numbered 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.

• 出版日期2009-8-26