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首页> 外文期刊>Advanced energy materials >Charge Transport Anisotropy in Highly Oriented Thin Films of the Acceptor Polymer P(NDI2OD-T2)
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Charge Transport Anisotropy in Highly Oriented Thin Films of the Acceptor Polymer P(NDI2OD-T2)

机译：受体聚合物P（NDI2OD-T2）高取向薄膜中的电荷传输各向异性

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摘要

The nanomorphology of the high mobility polymer poly{[N,N′-bis(2-octyldodecyl)-1,4,5,8-naphthalenedicarboximide-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} P(NDI2OD-T2) in thin films is explored as a function of different annealing conditions and correlated to optical and electrical properties. While nanofibrils with face-on orientation in form I are obtained directly after spin-coating and annealing below the melt transition temperature, clear evidence of lamellar structures is found after melt-annealing followed by slow cooling to room temperature. Interestingly these structural changes are accompanied by distinct changes in the absorption patterns. Electron diffraction measurements further show clear transitions towards predominant edge-on oriented chains in form II upon melt-annealing. Large-scale alignment with dichroic ratios up to 10 and improved order is achieved by high temperature rubbing and subsequent post-rubbing annealing. These highly oriented morphologies allow anisotropic in-plane charge transport to be probed with top-gate transistors parallel and perpendicular to the polymer chain direction. Mobilities up to 0.1 cm2 V-1 s-1 are observed parallel to the polymer chain, which is up to 10 times higher than those perpendicular to the polymer chain.
机译：高迁移率聚合物聚{[N，N'-双（2-辛基十二烷基）-1,4,5,8-萘二甲酰亚胺-2,6-二基] -alt-5,5'-（2,2研究了薄膜中P'（NDI2OD-T2）与不同退火条件的关系，并与光学和电学性质相关。在旋涂和低于熔融转变温度的退火之后，可以直接获得形式为I的面向正面的纳米原纤维，而在熔融退火然后缓慢冷却至室温后，可以发现明显的层状结构证据。有趣的是，这些结构变化伴随着吸收模式的明显变化。电子衍射测量还显示，在熔融退火后，向II型主要的边上取向的链明显过渡。通过高温摩擦和随后的后摩擦退火，可以实现二向色比高达10的大规模对准和改进的顺序。这些高度定向的形态使各向异性平面内电荷传输可以通过平行于和垂直于聚合物链方向的顶栅晶体管进行探测。观察到平行于聚合物链的迁移率最高为0.1 cm2 V-1 s-1，比垂直于聚合物链的迁移率高10倍。

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