Chem. J. Chinese Universities

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Charge Transport Study of a Series of Monosilanylene-oligothienylene Copolymer Films

JIANG Xiao-Qing1*, HARIMA Yutaka2   

    1. College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097, China;
    2. Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
  • Received:2006-09-28 Revised:1900-01-01 Online:2007-07-10 Published:2007-07-10
  • Contact: JIANG Xiao-Qing

Abstract:

Mobilities of charge carriers in thin films of a series of copolymers with repeat units consisting of monosilanylene and oligothienylene(PSnT, n denotes the ring number of an oligothienylene unit) are measured over a wide range of doping levels. Mobilities of charge carriers in these polymer films coincide well with each other in the very low doping regions below a doping level of 0.2%. The mobilities for these copolymer films increase as the doping level increases. Mobilities for the polymers with larger n start to rise at lower doping levels. The mobility enhancement follows an increasing order of the π-conjugation length. For PS14T, the enhancement exceeds 104, close to that observed for electrochemically synthesized polythiophene, implying that the π-conjugation length in this polymer is almost sufficient to reproduce charge transport properties of polythiophenes.

Key words: Mobility, Oligothiophene, Copolymer, Charge transport, Doping

CLC Number: 

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