The control of molecular organization in donor-acceptor polymers over various length scales is essential
for the charge carrier migration in organic field-effect transistors. Comprehensive understanding of the relation between
chemical structure of the polymer, molecular packing, self-assembly, microstructure and charge carrier
transport after solution processing, has been carried out thoroughly. The impact of the molecular structure variation
on the local packing of the polymer chains within well-defined layer-type superstructures has been found. The role
of molecular weight, bulkiness, and substitution position of the alkyl chains and backbone curvature on the packing,
microstructure and device performance is discussed. The surface organization of polymer and its film microstructure
are also influenced by the processing conditions. Corresponding processing techniques have been developed that allow a fine
control over the film deposition, microstructure formation and molecular orientation. Under optimized conditions, defect-free and highly
ordered mesoscopic fibers result in superior device properties. The following minireview is separated into two main topics which cover
the influence of chemical design and processing conditions on local packing and microstructure formation of polymeric organic semiconductors
applied in field-effect transistors.
Keywords: Self-assembly, donor-acceptor, conjugated polymer, morphology, field-effect transistor, organization, microstructure.
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