What determines the mobility of charge carriers in conjugated polymers?

  • Laquai F
  • Wegner G
  • Bässler H
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Abstract

In a conjugated polymer, the mobility of charge carriers is not a well-defined coefficient of a particular material as it is in an inorganic crystalline semiconductor but depends on the time domain of detection. On a time-scale of typically 100 fs, the on-chain mobility is ultra-high and controlled by the electronic band width of the polymer chain. When a carrier hits a chain imperfection, subsequent mesoscopic on-chain motion is retarded and controlled by intrachain disorder to which the chain environment contributes. Macroscopic transport commences after a time when interchain carrier jumps become rate limiting. It is routinely probed by time-of-flight experiments and can be rationalized in terms of random walk within a rough energy landscape. Experimental signatures of the various modes of transport are discussed.

Author-supplied keywords

  • Conjugated polymers
  • Hopping transport
  • Time-resolved photoconductivity

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Authors

  • Frédéric Laquai

  • Gerhard Wegner

  • Heinz Bässler

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