Alkylsubstituted thienothiophene semiconducting materials: Structure-property relationships Article

He, M, Li, J, Sorensen, ML et al. (2009). Alkylsubstituted thienothiophene semiconducting materials: Structure-property relationships . JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 131(33), 11930-11938. 10.1021/ja903895s

cited authors

  • He, M; Li, J; Sorensen, ML; Zhang, F; Hancock, RR; Hon, HF; Pozdin, VA; Smilgies, DM; Malliaras, GG

authors

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. 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 fieldeffect 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. © 2009 American Chemical Society.

publication date

  • August 26, 2009

published in

Digital Object Identifier (DOI)

start page

  • 11930

end page

  • 11938

volume

  • 131

issue

  • 33