Solvent
Vapor-Assisted Magnetic Manipulation of Molecular
Orientation and Carrier Transport of Semiconducting Polymers
Posted on 2020-06-19 - 06:33
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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Pan, Guoxing; Hu, Lin; Su, Songlin; Yuan, Jianyu; Li, Tian; Xiao, Xuhua; et al. (2020). Solvent
Vapor-Assisted Magnetic Manipulation of Molecular
Orientation and Carrier Transport of Semiconducting Polymers. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c02749