SolventVapor-Assisted Magnetic Manipulation of MolecularOrientation and Carrier Transport of Semiconducting Polymers
2020
Effective control
of the molecular orientation and the degree of
ordering in organic semiconductors is important to achieve high-performance
organic electronics. Herein, we have successfully achieved highly
oriented films in centimeter scale for a naphthalenedicarboximide-based
semiconducting polymer (P(NDI2OD-T2)) by solvent vapor annealing (SVA)
of precast films under a high magnetic field (HMF). As revealed by
the microstructural studies, the SVA-HMF films exhibit a remarkably
higher degree of chain alignment and high morphological uniformity
compared to the HMF-guided drop-cast films. Based on the structural
evolution of the films with the SVA time, a mechanism is proposed
to elucidate the alignment process, which emphasizes that the chain
aggregates re-formed in the swollen films trigger magnetic alignment
and determine the film order. Compared with the unaligned films, field-effect
transistors of the magnetic aligned P(NDI2OD-T2) films have exhibited
a 19-fold enhancement of electron mobility and an extraordinarily
large mobility anisotropy of 125. Furthermore, a significantly reduced
energetic barrier for activated transport is observed on the aligned
devices from temperature-variable measurements. The improved performance
achieved by the HMF-SVA process has indicated its potential for high-performance
organic electronic applications.
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