材料科学
电子迁移率
有机半导体
退火(玻璃)
聚合物
场效应晶体管
半导体
纳米技术
有机电子学
溶剂
化学工程
光电子学
晶体管
复合材料
有机化学
电压
化学
工程类
物理
量子力学
作者
Guoxing Pan,Lin Hu,Songlin Su,Jianyu Yuan,Tian Li,Xuhua Xiao,Qianwang Chen,Fapei Zhang
标识
DOI:10.1021/acsami.0c02749
摘要
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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