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Influence of extended π-conjugation units on carrier mobilities in conducting polymers |
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| Authors: | Y. Harima D.-H. Kim Y. Tsutitori X. Jiang R. Patil Y. Ooyama J. Ohshita A. Kunai |
| Affiliation: | aDepartment of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan bCollege of Chemistry and Environment Science, Nanjing Normal University, 122 Ninghai Road, Nanjing 210097, PR China cPolymer Science and Engineering Division, National Chemical Laboratory, Pune 411 008, India |
| Abstract: | Carrier mobilities in thin films of copolymers with repeat units consisting of oligothiophenes bridged by Si atoms are measured over a range of doping levels, where the numbers of thienylenes in the repeat unit are 7, 8, 10, 12, and 14. The mobilities for these polymer films increased with the increase in doping level and the mobility enhancement followed an increasing order of the π-conjugation length. The magnitude of the mobility increase for the Si polymer comprising 14 thiophene units reached ca. 104, implying that this π-conjugation length is almost sufficient to reproduce transport properties of polythiophenes. |
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