Mobility enhancement in conjugated polymer field-effect transistors through chain alignment in a liquid-crystalline phase

H. Sirringhaus; R. J. Wilson; R. H. Friend; M. Inbasekaran; W. Wu; E. P. Woo; M. Grell; D. D.C. Bradley

doi:10.1063/1.126991

Mobility enhancement in conjugated polymer field-effect transistors through chain alignment in a liquid-crystalline phase

H. Sirringhaus, R. J. Wilson, R. H. Friend, M. Inbasekaran, W. Wu, E. P. Woo, M. Grell, D. D.C. Bradley

Research output: Contribution to journal › Article › peer-review

784 Scopus citations

Abstract

A method is demonstrated by which liquid-crystalline self-organization in rigid-rod nematic conjugated polymers can be used to control the microstructure of the active semiconducting layer in solution-processed polymer thin-film transistors (TFTs). Enhanced charge carrier mobilities of 0.01-0.02cm2/Vs and good operating stability have been achieved in polyfluorene copolymer TFTs by preparing the polymer in a nematic glassy state and by aligning the polymer chains parallel to the transport direction with the help of an alignment layer. Mobility anisotropies of 5-8 for current flow parallel and perpendicular to the alignment direction have been observed that are of the same order of magnitude as optical dichroic ratios. © 2000 American Institute of Physics.

Original language	English (US)
Journal	Applied Physics Letters
Volume	77
Issue number	3
DOIs	https://doi.org/10.1063/1.126991
State	Published - Jul 17 2000
Externally published	Yes

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title = "Mobility enhancement in conjugated polymer field-effect transistors through chain alignment in a liquid-crystalline phase",

abstract = "A method is demonstrated by which liquid-crystalline self-organization in rigid-rod nematic conjugated polymers can be used to control the microstructure of the active semiconducting layer in solution-processed polymer thin-film transistors (TFTs). Enhanced charge carrier mobilities of 0.01-0.02cm2/Vs and good operating stability have been achieved in polyfluorene copolymer TFTs by preparing the polymer in a nematic glassy state and by aligning the polymer chains parallel to the transport direction with the help of an alignment layer. Mobility anisotropies of 5-8 for current flow parallel and perpendicular to the alignment direction have been observed that are of the same order of magnitude as optical dichroic ratios. {\textcopyright} 2000 American Institute of Physics.",

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AU - Sirringhaus, H.

AU - Wilson, R. J.

AU - Friend, R. H.

AU - Inbasekaran, M.

AU - Wu, W.

AU - Woo, E. P.

AU - Grell, M.

AU - Bradley, D. D.C.

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N2 - A method is demonstrated by which liquid-crystalline self-organization in rigid-rod nematic conjugated polymers can be used to control the microstructure of the active semiconducting layer in solution-processed polymer thin-film transistors (TFTs). Enhanced charge carrier mobilities of 0.01-0.02cm2/Vs and good operating stability have been achieved in polyfluorene copolymer TFTs by preparing the polymer in a nematic glassy state and by aligning the polymer chains parallel to the transport direction with the help of an alignment layer. Mobility anisotropies of 5-8 for current flow parallel and perpendicular to the alignment direction have been observed that are of the same order of magnitude as optical dichroic ratios. © 2000 American Institute of Physics.

AB - A method is demonstrated by which liquid-crystalline self-organization in rigid-rod nematic conjugated polymers can be used to control the microstructure of the active semiconducting layer in solution-processed polymer thin-film transistors (TFTs). Enhanced charge carrier mobilities of 0.01-0.02cm2/Vs and good operating stability have been achieved in polyfluorene copolymer TFTs by preparing the polymer in a nematic glassy state and by aligning the polymer chains parallel to the transport direction with the help of an alignment layer. Mobility anisotropies of 5-8 for current flow parallel and perpendicular to the alignment direction have been observed that are of the same order of magnitude as optical dichroic ratios. © 2000 American Institute of Physics.

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Mobility enhancement in conjugated polymer field-effect transistors through chain alignment in a liquid-crystalline phase

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