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
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